Merge branch 'feat/p3-gui-full-wiring-all-pages-consume-cor'

.gitignore

@@ -5,6 +5,10 @@
 # Local development docs
 /DevDocs/
 
+# Local acceptance screenshots (screenshot channel output, never committed)
+/.screens/
+/.tmp-screens/
+
 # Agent workspace (local-only)
 /.tower/
 

Cargo.lock

@@ -6032,6 +6032,8 @@ dependencies = [
 name = "unlucky-app"
 version = "0.1.0"
 dependencies = [
+ "serde",
+ "serde_json",
  "slint",
  "slint-build",
  "unlucky-agent",

crates/app/Cargo.toml

@@ -15,6 +15,11 @@ path = "src/main.rs"
 
 [dependencies]
 slint.workspace = true
+# 跨界 DTO 必须可序列化（AGENTS §6 / 01c §5）：事件与快照是 IPC 契约，
+# 序列化能力由 derive 钉住，测试里做 round-trip 断言。
+serde.workspace = true
+# host 层要读 core 设置/事件里的 JSON 值（serde_json 是 workspace 既有依赖）
+serde_json.workspace = true
 
 # 边界（01c §5 / D3）：app 只经 DTO 消费 core/agent，**不 import 内部类型**。
 # P0 的 host 是 src/mock.rs 的假后端；这两个依赖在这里登记，是为了后续把真实 host
@@ -25,5 +30,7 @@ unlucky-agent = { path = "../agent", version = "0.1" }
 [build-dependencies]
 slint-build.workspace = true
 
+[dev-dependencies]
+
 [lints]
 workspace = true

crates/app/src/backend.rs

@@ -0,0 +1,36 @@
+//! 后端选择与启动选项：真实 core host 优先，解析不出数据根时退回 mock。
+
+use std::path::{Path, PathBuf};
+
+use crate::dto::Backend;
+use crate::host::CoreHost;
+use crate::host::HostEnv;
+use crate::mock::MockBackend;
+
+/// 启动选项（截图/演示通道用；正常启动全用默认值）。
+#[derive(Debug, Clone, Default)]
+pub struct AppOptions {
+    /// 钉死数据根（`<root>/.ULL` + `<root>/.minecraft`）；None = 按便携配置解析
+    pub data_root: Option<PathBuf>,
+    /// 强制 mock 后端（UI 回归/无数据根演示）
+    pub mock: bool,
+}
+
+/// `<root>/.ULL/config/launcher.json`（与 `SettingsBridge::open` 同落点）。
+pub(crate) fn config_path(root: &Path) -> PathBuf {
+    root.join(".ULL").join("config").join("launcher.json")
+}
+
+/// 选后端：真实 host 优先；数据根解析不出来或显式 `--mock` 时退回假后端。
+pub(crate) fn build_backend(options: &AppOptions) -> Box<dyn Backend> {
+    if options.mock {
+        return Box::new(MockBackend::new());
+    }
+    match &options.data_root {
+        Some(root) => Box::new(CoreHost::new(HostEnv::at_root(root))),
+        None => match CoreHost::open() {
+            Some(host) => Box::new(host),
+            None => Box::new(MockBackend::new()),
+        },
+    }
+}

crates/app/src/callbacks.rs

@@ -180,10 +180,8 @@ fn wire_instances(ui: &crate::MainWindow, weak: &Weak<Inner>) {
         let weak = weak.clone();
         ui.on_new_instance(move || {
             let Some(this) = weak.upgrade() else { return };
-            this.state
-                .borrow_mut()
-                .toasts
-                .push(ToastKind::Info, "新建实例向导（G5）在 P1 落地");
+            // G5：打开向导（版本 → 加载器 → 名字 → 确认 → 安装进度）
+            this.state.borrow_mut().wizard = crate::wizard::WizardState::open();
             this.sync();
         });
     }

crates/app/src/callbacks_pages.rs

@@ -0,0 +1,256 @@
+//! `PageState` global 的回调接线：账户 / Java / 设置 / 通知 / 向导 / 崩溃导入 / 日志刷新。
+//!
+//! 与 `callbacks.rs` 同一纪律：每个回调 = 「改状态 + 发 AppCommand + 同步 UI」，一处看全。
+//! 用 global 而不是逐层转发属性（见 `ui/page_state.slint` 顶部的取舍说明）。
+
+use std::rc::Weak;
+
+use slint::ComponentHandle;
+
+use crate::conv;
+use crate::dto::{AppCommand, CreateRequest, LoaderKind};
+use crate::ui_bind::Inner;
+
+/// 接全部页面状态回调。
+pub(crate) fn wire_pages(weak: Weak<Inner>) {
+    let Some(inner) = weak.upgrade() else { return };
+    let page = inner.ui.global::<crate::PageState<'_>>();
+
+    // ── 账户 ──────────────────────────────────────────────────
+    {
+        let weak = weak.clone();
+        page.on_account_add_offline(move |name| {
+            let name = name.to_string();
+            if name.trim().is_empty() {
+                return;
+            }
+            let Some(this) = weak.upgrade() else { return };
+            this.dispatch(AppCommand::AddOfflineAccount(name));
+            this.ui
+                .global::<crate::PageState<'_>>()
+                .set_offline_name("".into());
+            this.sync();
+        });
+    }
+    {
+        let weak = weak.clone();
+        page.on_account_remove(move |id| {
+            let Some(this) = weak.upgrade() else { return };
+            this.dispatch(AppCommand::RemoveAccount(id.to_string()));
+            this.sync();
+        });
+    }
+    {
+        let weak = weak.clone();
+        page.on_account_switch(move |id| {
+            let Some(this) = weak.upgrade() else { return };
+            this.dispatch(AppCommand::SwitchAccount(id.to_string()));
+            this.sync();
+        });
+    }
+    {
+        let weak = weak.clone();
+        page.on_msa_begin(move || {
+            let Some(this) = weak.upgrade() else { return };
+            this.dispatch(AppCommand::StartDeviceLogin);
+            this.sync();
+        });
+    }
+    {
+        let weak = weak.clone();
+        page.on_msa_cancel(move || {
+            let Some(this) = weak.upgrade() else { return };
+            this.dispatch(AppCommand::CancelDeviceLogin);
+            this.sync();
+        });
+    }
+
+    // ── Java ──────────────────────────────────────────────────
+    {
+        let weak = weak.clone();
+        page.on_java_install(move |vendor| {
+            let Some(this) = weak.upgrade() else { return };
+            this.dispatch(AppCommand::InstallJava(vendor.to_string()));
+            this.sync();
+        });
+    }
+
+    // ── 设置 ──────────────────────────────────────────────────
+    {
+        let weak = weak.clone();
+        page.on_setting_changed(move |key, value| {
+            let Some(this) = weak.upgrade() else { return };
+            this.dispatch(AppCommand::SetSetting {
+                key: key.to_string(),
+                value: value.to_string(),
+            });
+            this.sync();
+        });
+    }
+    {
+        let weak = weak.clone();
+        page.on_setting_action(move |action| {
+            let Some(this) = weak.upgrade() else { return };
+            let action = action.to_string();
+            match action.as_str() {
+                // 清 24h 地区缓存 → 下次下载重新判定
+                "detect_region" => this.dispatch(AppCommand::SetSetting {
+                    key: "download.action.detect_region".to_string(),
+                    value: String::new(),
+                }),
+                // Java 分组的「安装/管理」→ 按回退链装一个托管 JDK
+                "install_java" => this.dispatch(AppCommand::InstallJava(String::new())),
+                _ => {}
+            }
+            this.sync();
+        });
+    }
+    {
+        let weak = weak.clone();
+        page.on_settings_tab_changed(move |tab| {
+            let Some(this) = weak.upgrade() else { return };
+            this.state.borrow_mut().settings_tab = tab.to_string();
+            this.sync();
+        });
+    }
+
+    // ── 通知 ──────────────────────────────────────────────────
+    {
+        let weak = weak.clone();
+        page.on_notice_dismiss(move |id| {
+            let Some(this) = weak.upgrade() else { return };
+            this.dispatch(AppCommand::DismissNotice(id.to_string()));
+            this.sync();
+        });
+    }
+
+    // ── 向导 ──────────────────────────────────────────────────
+    {
+        let weak = weak.clone();
+        page.on_wizard_open(move || {
+            let Some(this) = weak.upgrade() else { return };
+            this.state.borrow_mut().wizard = crate::wizard::WizardState::open();
+            this.sync();
+        });
+    }
+    {
+        let weak = weak.clone();
+        page.on_wizard_close(move || {
+            let Some(this) = weak.upgrade() else { return };
+            this.state.borrow_mut().wizard.open = false;
+            this.sync();
+        });
+    }
+    {
+        let weak = weak.clone();
+        page.on_wizard_select_version(move |version| {
+            let Some(this) = weak.upgrade() else { return };
+            this.state
+                .borrow_mut()
+                .wizard
+                .select_version(version.as_ref());
+            this.sync();
+        });
+    }
+    {
+        let weak = weak.clone();
+        page.on_wizard_select_loader(move |index| {
+            let Some(this) = weak.upgrade() else { return };
+            let loader = match index {
+                1 => LoaderKind::Fabric,
+                2 => LoaderKind::Quilt,
+                3 => LoaderKind::Forge,
+                4 => LoaderKind::NeoForge,
+                _ => LoaderKind::Vanilla,
+            };
+            this.state.borrow_mut().wizard.select_loader(loader);
+            this.sync();
+        });
+    }
+    {
+        let weak = weak.clone();
+        page.on_wizard_name_changed(move |name| {
+            let Some(this) = weak.upgrade() else { return };
+            let mut state = this.state.borrow_mut();
+            state.wizard.name = name.to_string();
+            state.wizard.error.clear();
+            drop(state);
+            this.sync();
+        });
+    }
+    {
+        let weak = weak.clone();
+        page.on_wizard_next(move || {
+            let Some(this) = weak.upgrade() else { return };
+            this.state.borrow_mut().wizard.advance();
+            this.sync();
+        });
+    }
+    {
+        let weak = weak.clone();
+        page.on_wizard_back(move || {
+            let Some(this) = weak.upgrade() else { return };
+            this.state.borrow_mut().wizard.step_back();
+            this.sync();
+        });
+    }
+    {
+        let weak = weak.clone();
+        page.on_wizard_confirm(move || {
+            let Some(this) = weak.upgrade() else { return };
+            let request = {
+                let state = this.state.borrow();
+                let wizard = &state.wizard;
+                wizard.ready_to_submit().map(|()| CreateRequest {
+                    version: wizard.version.trim().to_string(),
+                    loader: wizard.loader,
+                    loader_version: wizard.loader_version.trim().to_string(),
+                    name: wizard.name.trim().to_string(),
+                })
+            };
+            match request {
+                Ok(request) => {
+                    this.dispatch(AppCommand::CreateInstance(request));
+                    this.state.borrow_mut().wizard.submitted();
+                }
+                Err(error) => {
+                    this.state.borrow_mut().wizard.error = error;
+                }
+            }
+            this.sync();
+        });
+    }
+    {
+        let weak = weak.clone();
+        page.on_install_cancel(move || {
+            let Some(this) = weak.upgrade() else { return };
+            this.dispatch(AppCommand::CancelInstall);
+            this.sync();
+        });
+    }
+
+    // ── 日志页 ────────────────────────────────────────────────
+    {
+        let weak = weak.clone();
+        page.on_crash_import(move |path| {
+            let Some(this) = weak.upgrade() else { return };
+            let path = path.to_string();
+            if path.trim().is_empty() {
+                return;
+            }
+            this.dispatch(AppCommand::ImportCrashLog(path));
+            this.sync();
+        });
+    }
+    {
+        let weak = weak.clone();
+        page.on_logs_refresh(move || {
+            let Some(this) = weak.upgrade() else { return };
+            this.dispatch(AppCommand::RefreshLogSessions);
+            this.sync();
+        });
+    }
+
+    // 设置页分组切换同时刷新一遍分组快照（外部改配置后手点分组即最新）
+    let _ = conv::setting_groups;
+}

crates/app/src/conv/instances.rs

@@ -33,6 +33,7 @@ pub fn phase(runtime: &InstanceRuntime) -> (RuntimePhase, f32, String) {
                 dto::LaunchStage::Download => RuntimePhase::Downloading,
                 dto::LaunchStage::Verify => RuntimePhase::Verifying,
                 dto::LaunchStage::Launch => RuntimePhase::Launching,
+                dto::LaunchStage::Window => RuntimePhase::Running,
             };
             (phase, progress.ratio(), stage.label().to_string())
         }

crates/app/src/conv/mod.rs

@@ -8,12 +8,17 @@
 mod agent;
 mod instances;
 mod logs;
+mod pages;
 mod ui;
 mod versions;
 
 pub use agent::{chat, dialog, toasts};
 pub use instances::{running_tiles, tiles};
 pub use logs::{diagnosis, log_lines, log_sessions};
+pub use pages::{
+    accounts, active_account_name, device, install, java_chain, java_runtimes, java_vendors,
+    notices, setting_groups, wizard, wizard_versions,
+};
 pub use ui::{
     accent_color, bg_fill, bg_fill_from, category_from, instance_view, instance_view_from, route,
     route_from, theme_mode, theme_mode_from, tile_size, tile_size_from, version_category,

crates/app/src/conv/pages.rs

@@ -0,0 +1,300 @@
+//! 状态 → `page_state.slint` 的视图模型（账户 / Java / 安装 / 设置分组 / 通知 / 向导）。
+//!
+//! 与 `conv/{instances,versions,logs,agent}.rs` 同一套路：只做「领域值 → 展示值」的搬运，
+//! 不含业务判断。`ui_bind::sync` 把这些灌进 `PageState` global。
+
+use slint::{ModelRc, SharedString, VecModel};
+
+use crate::dto::{
+    AccountKind as DtoAccountKind, DeviceLoginPhase, InstallStage as DtoInstallStage,
+    JavaChainOutcome, NoticeLevel, SettingControl, VersionKind as DtoVersionKind,
+};
+use crate::state::AppState;
+use crate::wizard::WizardStep;
+use crate::{
+    AccountKind, InstallStage, JavaStepOutcome, NoticeKind, SettingControl as UiControl, UiAccount,
+    UiDeviceCode, UiInstallProgress, UiJavaRuntime, UiJavaStep, UiJavaVendor, UiNotice,
+    UiSettingGroup, UiSettingRow, UiVersion, UiWizard,
+};
+
+fn strings(items: &[String]) -> ModelRc<SharedString> {
+    ModelRc::new(VecModel::from(
+        items
+            .iter()
+            .map(|item| SharedString::from(item.as_str()))
+            .collect::<Vec<_>>(),
+    ))
+}
+
+/// 账户行。
+pub fn accounts(state: &AppState) -> Vec<UiAccount> {
+    state
+        .accounts
+        .iter()
+        .map(|account| UiAccount {
+            id: account.id.as_str().into(),
+            name: account.name.as_str().into(),
+            kind: match account.kind {
+                DtoAccountKind::Offline => AccountKind::Offline,
+                DtoAccountKind::Microsoft => AccountKind::Microsoft,
+                DtoAccountKind::Authlib => AccountKind::Authlib,
+            },
+            kind_label: account.kind.label().into(),
+            profile_id: account.profile_id.as_str().into(),
+            login_name: account.login_name.as_str().into(),
+            created: account.created.as_str().into(),
+            active: account.active,
+        })
+        .collect()
+}
+
+/// 当前启动账户的展示名（导航底部头像）。
+pub fn active_account_name(state: &AppState) -> String {
+    state
+        .accounts
+        .iter()
+        .find(|account| account.active)
+        .map(|account| account.name.clone())
+        .unwrap_or_else(|| "未登录".to_string())
+}
+
+/// 设备码登录面板。
+pub fn device(state: &AppState) -> UiDeviceCode {
+    let view = &state.device_login;
+    UiDeviceCode {
+        visible: view.phase.visible(),
+        busy: view.phase.busy(),
+        user_code: view.user_code.as_str().into(),
+        verification_uri: view.verification_uri.as_str().into(),
+        qr_link: view.qr_link.as_str().into(),
+        expires: i32::try_from(view.expires_in).unwrap_or(i32::MAX),
+        message: view.message.as_str().into(),
+        phase_label: match view.phase {
+            DeviceLoginPhase::Idle => "空闲",
+            DeviceLoginPhase::Requesting => "申请中",
+            DeviceLoginPhase::Waiting => "等待确认",
+            DeviceLoginPhase::Succeeded => "成功",
+            DeviceLoginPhase::Failed => "失败",
+        }
+        .into(),
+    }
+}
+
+/// Java 发行版行。
+pub fn java_vendors(state: &AppState) -> Vec<UiJavaVendor> {
+    state
+        .java
+        .vendors
+        .iter()
+        .map(|vendor| UiJavaVendor {
+            id: vendor.id.as_str().into(),
+            display: vendor.display.as_str().into(),
+            rank: i32::try_from(vendor.rank).unwrap_or(0),
+            majors: vendor.majors.as_str().into(),
+            sources: vendor.sources.join(" · ").into(),
+            installed: vendor.installed,
+        })
+        .collect()
+}
+
+/// Java 回退链。
+pub fn java_chain(state: &AppState) -> Vec<UiJavaStep> {
+    state
+        .java
+        .chain
+        .iter()
+        .map(|step| UiJavaStep {
+            vendor: step.vendor.as_str().into(),
+            outcome: match step.outcome {
+                JavaChainOutcome::Pending => JavaStepOutcome::Pending,
+                JavaChainOutcome::Skip => JavaStepOutcome::Skip,
+                JavaChainOutcome::Failed => JavaStepOutcome::Failed,
+                JavaChainOutcome::Hit => JavaStepOutcome::Hit,
+            },
+            outcome_label: step.outcome.label().into(),
+            detail: step.detail.as_str().into(),
+        })
+        .collect()
+}
+
+/// Java 本地运行时。
+pub fn java_runtimes(state: &AppState) -> Vec<UiJavaRuntime> {
+    state
+        .java
+        .runtimes
+        .iter()
+        .map(|runtime| UiJavaRuntime {
+            binary: runtime.binary.as_str().into(),
+            version: runtime.version.as_str().into(),
+            vendor: runtime.vendor.as_str().into(),
+            origin: runtime.origin.as_str().into(),
+        })
+        .collect()
+}
+
+/// 安装进度卡片。
+pub fn install(state: &AppState) -> UiInstallProgress {
+    let Some(progress) = &state.install else {
+        return UiInstallProgress {
+            visible: false,
+            stage: InstallStage::Planning,
+            ..UiInstallProgress::default()
+        };
+    };
+    UiInstallProgress {
+        visible: true,
+        version: progress.version.as_str().into(),
+        instance: progress.instance.as_str().into(),
+        loader: progress.loader.as_str().into(),
+        stage: match progress.stage {
+            DtoInstallStage::Planning => InstallStage::Planning,
+            DtoInstallStage::Downloading => InstallStage::Downloading,
+            DtoInstallStage::Installing => InstallStage::Installing,
+            DtoInstallStage::Registering => InstallStage::Registering,
+            DtoInstallStage::Done => InstallStage::Done,
+            DtoInstallStage::Failed => InstallStage::Failed,
+            DtoInstallStage::Cancelled => InstallStage::Cancelled,
+        },
+        stage_label: progress.stage.label().into(),
+        ratio: progress.ratio(),
+        known: progress.is_known(),
+        files_label: progress.files_label().into(),
+        bytes_label: if progress.bytes_total > 0 {
+            format!(
+                "{}/{}",
+                crate::dto::human_bytes(progress.bytes_done),
+                crate::dto::human_bytes(progress.bytes_total)
+            )
+        } else {
+            String::new()
+        }
+        .into(),
+        speed: progress.speed_label().into(),
+        eta: progress.eta_label().into(),
+        message: progress.message.as_str().into(),
+        terminal: progress.stage.is_terminal(),
+        failed: progress.stage == DtoInstallStage::Failed,
+    }
+}
+
+/// 设置分组（行 + 控件）。
+pub fn setting_groups(state: &AppState) -> Vec<UiSettingGroup> {
+    state
+        .settings_groups
+        .iter()
+        .map(|group| UiSettingGroup {
+            id: group.id.as_str().into(),
+            title: group.title.as_str().into(),
+            rows: ModelRc::new(VecModel::from(
+                group
+                    .rows
+                    .iter()
+                    .map(|row| UiSettingRow {
+                        key: row.key.as_str().into(),
+                        label: row.label.as_str().into(),
+                        description: row.description.as_str().into(),
+                        control: match row.control {
+                            SettingControl::Toggle => UiControl::Toggle,
+                            SettingControl::Choice => UiControl::Choice,
+                            SettingControl::Text => UiControl::Text,
+                            SettingControl::ReadOnly => UiControl::Readonly,
+                            SettingControl::Action => UiControl::Action,
+                        },
+                        flag: row.flag,
+                        selected: row.selected,
+                        options: strings(&row.options),
+                        value_text: row.value_text.as_str().into(),
+                        action: row.action.as_str().into(),
+                    })
+                    .collect::<Vec<_>>(),
+            )),
+        })
+        .collect()
+}
+
+/// 横幅通知。
+pub fn notices(state: &AppState) -> Vec<UiNotice> {
+    state
+        .notices
+        .iter()
+        .map(|notice| UiNotice {
+            id: notice.id.as_str().into(),
+            kind: match notice.level {
+                NoticeLevel::Info => NoticeKind::Info,
+                NoticeLevel::Warn => NoticeKind::Warn,
+                NoticeLevel::Error => NoticeKind::Error,
+            },
+            title: notice.title.as_str().into(),
+            body: notice.body.as_str().into(),
+        })
+        .collect()
+}
+
+/// 向导状态。
+pub fn wizard(state: &AppState) -> UiWizard {
+    let wizard = &state.wizard;
+    let step = wizard.step;
+    let can_next = match step {
+        WizardStep::Version => !wizard.version.trim().is_empty(),
+        WizardStep::Name => crate::wizard::validate_name(&wizard.name).is_ok(),
+        WizardStep::Loader | WizardStep::Confirm => true,
+        WizardStep::Progress => false,
+    };
+    UiWizard {
+        open: wizard.open,
+        step: i32::try_from(step.index()).unwrap_or(0),
+        step_label: step.title().into(),
+        step_index: i32::try_from(step.index()).unwrap_or(0),
+        step_total: 5,
+        version: wizard.version.as_str().into(),
+        loader: loader_index(wizard.loader),
+        loader_label: if wizard.loader == crate::dto::LoaderKind::Vanilla {
+            "原版".to_string()
+        } else {
+            format!("{} {}", wizard.loader.label(), wizard.loader_version.trim())
+                .trim()
+                .to_string()
+        }
+        .into(),
+        loader_version: wizard.loader_version.as_str().into(),
+        name: wizard.name.as_str().into(),
+        error: wizard.error.as_str().into(),
+        busy: wizard.submitting,
+        can_next,
+    }
+}
+
+/// 加载器在向导里的单选序号（与 `wizard.slint` 的 LoaderChoice 顺序一致）。
+pub fn loader_index(loader: crate::dto::LoaderKind) -> i32 {
+    match loader {
+        crate::dto::LoaderKind::Vanilla => 0,
+        crate::dto::LoaderKind::Fabric => 1,
+        crate::dto::LoaderKind::Quilt => 2,
+        crate::dto::LoaderKind::Forge => 3,
+        crate::dto::LoaderKind::NeoForge => 4,
+        crate::dto::LoaderKind::OptiFine | crate::dto::LoaderKind::LiteLoader => 0,
+    }
+}
+
+/// 向导里的版本列表（正式版 + 快照；远古版走下载页的显式入口）。
+pub fn wizard_versions(state: &AppState) -> Vec<UiVersion> {
+    state
+        .versions
+        .iter()
+        .filter(|version| !version.kind.is_ancient())
+        .map(|version| UiVersion {
+            id: version.id.as_str().into(),
+            kind: match version.kind {
+                DtoVersionKind::Release => crate::VersionKind::Release,
+                _ => crate::VersionKind::Snapshot,
+            },
+            released: version.released.as_str().into(),
+            installed: version.installed,
+            ancient: false,
+        })
+        .collect()
+}
+
+#[cfg(test)]
+#[path = "pages_tests.rs"]
+mod tests;

crates/app/src/conv/pages_tests.rs

@@ -0,0 +1,156 @@
+//! conv/pages.rs 的单测（拆文件守 400 行上限）。
+
+use super::*;
+use crate::dto::{
+    AccountView, DeviceLoginView, InstallProgressView, JavaPageView, JavaVendorView, NoticeView,
+    SettingGroupView, SettingRowView, VersionSummary,
+};
+use crate::wizard::WizardState;
+use slint::Model;
+
+#[test]
+fn accounts_and_device_login_render() {
+    let mut state = AppState::new();
+    state.accounts = vec![AccountView {
+        id: "account:1".to_string(),
+        name: "Steve".to_string(),
+        kind: DtoAccountKind::Offline,
+        profile_id: "0f8f".to_string(),
+        login_name: String::new(),
+        created: "2026-10-31 20:12".to_string(),
+        active: true,
+    }];
+    state.device_login =
+        DeviceLoginView::waiting("ABCD-EFGH", "https://www.microsoft.com/link", 900, "");
+
+    let rows = accounts(&state);
+    assert_eq!(rows.len(), 1);
+    assert!(rows[0].active);
+    assert_eq!(rows[0].kind_label, "离线");
+    assert_eq!(active_account_name(&state), "Steve");
+
+    let device = device(&state);
+    assert!(device.visible && device.busy);
+    assert_eq!(device.user_code, "ABCD-EFGH");
+    assert_eq!(device.phase_label, "等待确认");
+}
+
+#[test]
+fn install_progress_renders_labels_and_terminal_flags() {
+    let mut state = AppState::new();
+    state.install = Some(InstallProgressView {
+        version: "1.20.4".to_string(),
+        instance: "生存".to_string(),
+        loader: "Fabric 0.16.5".to_string(),
+        stage: DtoInstallStage::Downloading,
+        files_done: 3,
+        files_total: 6,
+        bytes_done: 1024,
+        bytes_total: 4096,
+        speed_bps: 2048,
+        eta_secs: 2,
+        message: "下载中".to_string(),
+    });
+    let ui = install(&state);
+    assert!(ui.visible && !ui.terminal && !ui.failed);
+    assert!((ui.ratio - 0.5).abs() < f32::EPSILON);
+    assert_eq!(ui.files_label, "3/6 文件");
+    assert_eq!(ui.speed, "2.0 KB/s");
+    assert_eq!(ui.eta, "剩 2s");
+
+    state.install = None;
+    assert!(!install(&state).visible);
+}
+
+#[test]
+fn java_chain_and_vendors_map_outcomes() {
+    let mut state = AppState::new();
+    state.java = JavaPageView {
+        vendors: vec![JavaVendorView {
+            id: "temurin".to_string(),
+            display: "Eclipse Temurin".to_string(),
+            rank: 1,
+            majors: "17/21".to_string(),
+            sources: vec!["BMCLAPI".to_string(), "GitHub".to_string()],
+            installed: true,
+        }],
+        chain: vec![crate::dto::JavaChainStep {
+            vendor: "temurin".to_string(),
+            outcome: JavaChainOutcome::Hit,
+            detail: "21".to_string(),
+        }],
+        ..JavaPageView::new()
+    };
+    let vendors = java_vendors(&state);
+    assert_eq!(vendors.len(), 1);
+    assert_eq!(vendors[0].sources, "BMCLAPI · GitHub");
+    let chain = java_chain(&state);
+    assert!(matches!(chain[0].outcome, JavaStepOutcome::Hit));
+    assert_eq!(chain[0].outcome_label, "命中");
+}
+
+#[test]
+fn settings_groups_map_controls() {
+    let mut state = AppState::new();
+    state.settings_groups = vec![SettingGroupView::new("download", "下载")
+        .with(SettingRowView::toggle("agent.mcp.enabled", "MCP", "", true))
+        .with(SettingRowView::choice(
+            "download.region",
+            "地区",
+            "",
+            &["auto", "cn"],
+            1,
+        ))];
+    let groups = setting_groups(&state);
+    assert_eq!(groups.len(), 1);
+    let rows = groups[0].rows.clone();
+    assert_eq!(rows.row_count(), 2);
+    let first = rows.row_data(0).expect("第一行");
+    let second = rows.row_data(1).expect("第二行");
+    assert!(first.flag);
+    assert!(matches!(second.control, UiControl::Choice));
+    assert_eq!(second.selected, 1);
+}
+
+#[test]
+fn notices_and_wizard_render() {
+    let mut state = AppState::new();
+    state.notices = vec![NoticeView::new(
+        "isolation:x",
+        NoticeLevel::Warn,
+        "隔离档位已切换",
+        "两侧都有内容",
+    )];
+    let notices = notices(&state);
+    assert!(matches!(notices[0].kind, NoticeKind::Warn));
+
+    state.wizard = WizardState::open();
+    state.wizard.select_version("1.20.4");
+    let wizard = wizard(&state);
+    assert!(wizard.open);
+    assert_eq!(wizard.step_label, "选择版本");
+    assert!(wizard.can_next);
+    assert_eq!(wizard.loader, 0);
+}
+
+#[test]
+fn wizard_versions_skip_ancient_ones() {
+    let mut state = AppState::new();
+    state.versions = vec![
+        VersionSummary {
+            id: "1.20.4".to_string(),
+            kind: DtoVersionKind::Release,
+            released: "2023-12-07".to_string(),
+            installed: false,
+        },
+        VersionSummary {
+            id: "rd-132211".to_string(),
+            kind: DtoVersionKind::Ancient(crate::dto::AncientKind::Classic),
+            released: "2009-05-13".to_string(),
+            installed: false,
+        },
+    ];
+    let rows = wizard_versions(&state);
+    assert_eq!(rows.len(), 1);
+    assert_eq!(rows[0].id, "1.20.4");
+}

crates/app/src/conv/versions.rs

@@ -1,17 +1,25 @@
 //! 版本列表与下载分类映射（下载页）。
 
-use crate::dto::{AncientKind, VersionKind as DtoVersionKind};
+use crate::dto::{AncientKind, VersionCategory, VersionKind as DtoVersionKind, VersionSummary};
 use crate::state::AppState;
 use crate::{UiVersion, VersionKind};
 
-/// 下载页版本行（已按「仅已装」+ 版本号筛选词过滤）。
-pub fn versions(state: &AppState) -> Vec<UiVersion> {
-    let query = state.download_query.trim().to_lowercase();
-    state
-        .versions
+/// 分类侧栏 → 该分类下的版本（远古版按子类细分）。
+pub fn in_category(category: VersionCategory, kind: DtoVersionKind) -> bool {
+    match (category, kind) {
+        (VersionCategory::Release, DtoVersionKind::Release) => true,
+        (VersionCategory::Snapshot, DtoVersionKind::Snapshot) => true,
+        (VersionCategory::Ancient(expected), DtoVersionKind::Ancient(actual)) => expected == actual,
+        // 未接线的分类（整合包 / Mod）不显示任何版本，而不是把全部版本倒进去
+        (VersionCategory::Modpack | VersionCategory::Mod, _) => false,
+        _ => false,
+    }
+}
+
+/// 版本行（下载页与新建向导共用）。
+pub fn version_rows(versions: &[VersionSummary]) -> Vec<UiVersion> {
+    versions
         .iter()
-        .filter(|version| !state.installed_only || version.installed)
-        .filter(|version| query.is_empty() || version.id.to_lowercase().contains(&query))
         .map(|version| UiVersion {
             id: version.id.clone().into(),
             kind: version_kind(version.kind),
@@ -22,6 +30,20 @@ pub fn versions(state: &AppState) -> Vec<UiVersion> {
         .collect()
 }
 
+/// 下载页版本行（按当前分类 + 「仅已装」+ 版本号筛选词过滤）。
+pub fn versions(state: &AppState) -> Vec<UiVersion> {
+    let query = state.download_query.trim().to_lowercase();
+    let filtered: Vec<VersionSummary> = state
+        .versions
+        .iter()
+        .filter(|version| in_category(state.prefs.download_category, version.kind))
+        .filter(|version| !state.installed_only || version.installed)
+        .filter(|version| query.is_empty() || version.id.to_lowercase().contains(&query))
+        .cloned()
+        .collect();
+    version_rows(&filtered)
+}
+
 fn version_kind(kind: DtoVersionKind) -> VersionKind {
     match kind {
         DtoVersionKind::Release => VersionKind::Release,

crates/app/src/dialogs.rs

@@ -4,11 +4,13 @@
 //! 当前条被确认/取消后由 [`DialogQueue::advance`] 推进到下一条，UI 只渲染 `current`。
 //! 非阻塞提示走 [`crate::toast`]，不占模态队列。
 
+use serde::{Deserialize, Serialize};
+
 /// 对话框标识。
 pub type DialogId = u64;
 
 /// 对话框来源：决定插队优先级。
-#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
 pub enum DialogSource {
     /// 提示类（教程、首次使用说明）
     Hint = 0,
@@ -26,7 +28,7 @@ impl DialogSource {
 }
 
 /// 对话框类型（09 §3：确认 / 进度 / 输入 / 错误）。
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub enum DialogKind {
     /// 确认：主按钮 + 次按钮
     Confirm {
@@ -87,7 +89,7 @@ impl DialogKind {
 }
 
 /// 一条对话框请求。
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub struct DialogRequest {
     /// 队列内唯一 id（由 [`DialogQueue::push_request`] 重新编号）
     pub id: DialogId,

crates/app/src/dto/accounts.rs

@@ -0,0 +1,224 @@
+//! 账户页 DTO：三条轨道的统一抽象 + 微软设备码登录的可见状态。
+//!
+//! **凭据红线**：本模块（以及整个 `crate::dto`）只有 [`AccountView`] 这种公开字段视图。
+//! `core::auth` 的 `Credentials` / `MicrosoftSession` / token 永远不进 app 层——
+//! host 侧在拿到账户快照的那一刻就丢掉凭据，只留「能显示什么」。
+
+use serde::{Deserialize, Serialize};
+
+/// 账户轨道（三轨统一抽象，`09 §G6` / `D9`）。
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum AccountKind {
+    /// 离线账户（HMCL 兼容 UUID）
+    Offline,
+    /// 微软正版
+    Microsoft,
+    /// authlib-injector（第三方皮肤站）
+    Authlib,
+}
+
+impl AccountKind {
+    /// 徽标文字。
+    pub fn label(self) -> &'static str {
+        match self {
+            Self::Offline => "离线",
+            Self::Microsoft => "微软",
+            Self::Authlib => "第三方",
+        }
+    }
+
+    /// 稳定 id（事件/持久化用；与 core 的 `kind.as_str()` 同词表）。
+    pub fn as_str(self) -> &'static str {
+        match self {
+            Self::Offline => "offline",
+            Self::Microsoft => "microsoft",
+            Self::Authlib => "authlib_injector",
+        }
+    }
+
+    /// 从 core 的稳定 id 解析（未知轨道按离线处理，不让一个坏条目毁掉整个列表）。
+    pub fn parse(raw: &str) -> Self {
+        match raw {
+            "microsoft" => Self::Microsoft,
+            "authlib_injector" => Self::Authlib,
+            _ => Self::Offline,
+        }
+    }
+}
+
+/// 账户列表行（**只含可公开字段**）。
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct AccountView {
+    /// 稳定 id（`account:...`）
+    pub id: String,
+    /// 展示名
+    pub name: String,
+    /// 轨道
+    pub kind: AccountKind,
+    /// 档案 UUID（公开）
+    pub profile_id: String,
+    /// 登录名（微软轨才有；可空）
+    pub login_name: String,
+    /// 创建时间展示串（`2026-10-31 20:12`）
+    pub created: String,
+    /// 是否是当前启动使用的账户
+    pub active: bool,
+}
+
+/// 设备码登录阶段（UI 据此切换面板）。
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum DeviceLoginPhase {
+    /// 没有登录在进行
+    Idle,
+    /// 正在向微软申请设备码（短暂）
+    Requesting,
+    /// 已拿到用户码，等待用户在浏览器完成
+    Waiting,
+    /// 成功（账户已入库）
+    Succeeded,
+    /// 失败（原因在 `message`，已脱敏）
+    Failed,
+}
+
+impl DeviceLoginPhase {
+    /// 面板是否要显示（非 Idle 都显示）。
+    pub fn visible(self) -> bool {
+        !matches!(self, Self::Idle)
+    }
+
+    /// 是否还在跑（Requesting / Waiting）。
+    pub fn busy(self) -> bool {
+        matches!(self, Self::Requesting | Self::Waiting)
+    }
+}
+
+/// 设备码登录的可见状态。
+///
+/// `user_code` / `verification_uri` 来自 `core::auth::microsoft::DeviceCodePrompt`——
+/// 它们本来就是给用户看的，不是凭据。
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct DeviceLoginView {
+    /// 阶段
+    pub phase: DeviceLoginPhase,
+    /// 用户码（`ABCD-EFGH`）
+    pub user_code: String,
+    /// 验证地址（`https://www.microsoft.com/link`）
+    pub verification_uri: String,
+    /// 二维码内容（= 带码的链接；GUI 用文本展示，终端可直接打开）
+    pub qr_link: String,
+    /// 有效期（秒；0 = 未知）
+    pub expires_in: u64,
+    /// 状态/错误文案
+    pub message: String,
+    /// 成功后入库的账户展示名
+    pub account_name: String,
+}
+
+impl Default for DeviceLoginView {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl DeviceLoginView {
+    /// 空闲态。
+    pub fn new() -> Self {
+        Self {
+            phase: DeviceLoginPhase::Idle,
+            user_code: String::new(),
+            verification_uri: String::new(),
+            qr_link: String::new(),
+            expires_in: 0,
+            message: String::new(),
+            account_name: String::new(),
+        }
+    }
+
+    /// 已拿到用户码（`present` 回调时刻）。
+    pub fn waiting(
+        user_code: &str,
+        verification_uri: &str,
+        expires_in: u64,
+        qr_hint: &str,
+    ) -> Self {
+        let qr_link = if qr_hint.is_empty() {
+            format!("{verification_uri}?code={user_code}")
+        } else {
+            qr_hint.to_string()
+        };
+        Self {
+            phase: DeviceLoginPhase::Waiting,
+            user_code: user_code.to_string(),
+            verification_uri: verification_uri.to_string(),
+            qr_link,
+            expires_in,
+            message: format!(
+                "在浏览器打开 {verification_uri} 并输入用户码 {user_code}（{} 秒内有效）",
+                expires_in
+            ),
+            account_name: String::new(),
+        }
+    }
+
+    /// 失败态。
+    pub fn failed(message: impl Into<String>) -> Self {
+        Self {
+            phase: DeviceLoginPhase::Failed,
+            message: message.into(),
+            ..Self::new()
+        }
+    }
+
+    /// 成功态。
+    pub fn succeeded(account_name: impl Into<String>) -> Self {
+        let account_name = account_name.into();
+        Self {
+            phase: DeviceLoginPhase::Succeeded,
+            message: format!("已登录：{account_name}"),
+            account_name,
+            ..Self::new()
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn kind_round_trips_through_stable_ids() {
+        for kind in [
+            AccountKind::Offline,
+            AccountKind::Microsoft,
+            AccountKind::Authlib,
+        ] {
+            assert_eq!(AccountKind::parse(kind.as_str()), kind);
+            assert!(!kind.label().is_empty());
+        }
+    }
+
+    #[test]
+    fn device_login_view_never_carries_tokens() {
+        let view = DeviceLoginView::waiting("ABCD-EFGH", "https://www.microsoft.com/link", 900, "");
+        assert_eq!(view.phase, DeviceLoginPhase::Waiting);
+        assert!(view.phase.busy());
+        assert!(view.qr_link.contains("ABCD-EFGH"));
+        let json = serde_json::to_string(&view).expect("序列化");
+        for forbidden in ["token", "secret", "password", "refresh"] {
+            assert!(
+                !json.to_lowercase().contains(forbidden),
+                "视图里不该出现 {forbidden}"
+            );
+        }
+    }
+
+    #[test]
+    fn succeeded_and_failed_clear_the_code() {
+        let ok = DeviceLoginView::succeeded("Steve");
+        assert_eq!(ok.phase, DeviceLoginPhase::Succeeded);
+        assert!(ok.user_code.is_empty());
+        let bad = DeviceLoginView::failed("网络超时");
+        assert_eq!(bad.phase, DeviceLoginPhase::Failed);
+        assert_eq!(bad.message, "网络超时");
+    }
+}

crates/app/src/dto/agent.rs

@@ -1,7 +1,9 @@
 //! AI 会话 DTO：消息、工具调用可视化与 agent 事件。
 
+use serde::{Deserialize, Serialize};
+
 /// 会话消息角色。
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ChatRole {
     /// 用户
     User,
@@ -14,7 +16,7 @@ pub enum ChatRole {
 }
 
 /// 工具调用可视化条目。
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct ToolCallView {
     /// 工具名（与 ToolSpec 注册表同名）
     pub name: String,
@@ -25,7 +27,7 @@ pub struct ToolCallView {
 }
 
 /// 一条会话消息。
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct ChatMessage {
     /// 角色
     pub role: ChatRole,
@@ -60,7 +62,7 @@ impl ChatMessage {
 }
 
 /// agent 侧事件。
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub enum AgentEvent {
     /// 追加一条完整消息
     MessageAppended(ChatMessage),

crates/app/src/dto/events.rs

@@ -1,12 +1,46 @@
 //! 事件与指令：core/agent → app 的事件队列，app → core/agent 的用户意图。
+//!
+//! 三条通道（01c §5）：①不可变快照发布（`*Changed` 整体替换）②事件流（`LogAppended` /
+//! `InstallProgress` / `DeviceLoginChanged`）③注入的显示服务（先落成事件，见 `DialogRequested`）。
+//! 全部类型 `Serialize + Deserialize`：这是 IPC 契约（AGENTS §6）。
+
+use serde::{Deserialize, Serialize};
 
 use crate::dialogs::{DialogId, DialogRequest};
-use crate::dto::{AgentEvent, DiagnosisReport, InstanceId, InstanceRuntime, InstanceSummary};
-use crate::dto::{LogLine, LogSession, SessionId, VersionCategory, VersionSummary};
+use crate::dto::CreateRequest;
+use crate::dto::{
+    AccountView, AgentEvent, DeviceLoginView, DiagnosisReport, InstallProgressView, InstanceId,
+    InstanceRuntime, InstanceSummary, JavaPageView, LogLine, LogOutcome, LogSession, NoticeView,
+    SessionId, SettingGroupView, VersionCategory, VersionSummary,
+};
 use crate::toast::Toast;
 
+/// 启动会话的一段实时日志（host 尾随 JSONL 后按批次发）。
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct LiveLogBatch {
+    /// 会话 id
+    pub session: SessionId,
+    /// 新增行
+    pub lines: Vec<LogLine>,
+    /// 会话是否还在跑（false = 收尾，可以触发诊断/刷新列表）
+    pub running: bool,
+}
+
+/// 一次启动收尾（磁贴状态回写 + 日志页会话列表刷新）。
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct LaunchFinished {
+    /// 实例 id
+    pub id: InstanceId,
+    /// 会话 id
+    pub session: SessionId,
+    /// 结局
+    pub outcome: LogOutcome,
+    /// 一句人读结论（`正常退出` / `崩溃（exit 1）` / `启动失败：…`）
+    pub summary: String,
+}
+
 /// core 侧事件（不可变快照发布 + 事件流，01c §5 的三条通道之二）。
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub enum CoreEvent {
     /// 实例列表整体刷新
     InstancesChanged(Vec<InstanceSummary>),
@@ -21,15 +55,31 @@ pub enum CoreEvent {
     VersionListChanged(Vec<VersionSummary>),
     /// 日志会话列表刷新
     LogSessionsChanged(Vec<LogSession>),
-    /// 当前会话日志行刷新（P0 整批替换；P1 改增量追加）
+    /// 当前会话日志行刷新（整批替换）
     LogLinesChanged(Vec<LogLine>),
+    /// 实时日志增量（启动中尾随 JSONL；`running=false` 表示会话收尾）
+    LogAppended(LiveLogBatch),
+    /// 启动收尾（磁贴状态回写 + toast）
+    LaunchFinished(LaunchFinished),
     /// 诊断结论产出
     DiagnosisReady(DiagnosisReport),
+    /// 账户列表刷新
+    AccountsChanged(Vec<AccountView>),
+    /// 设备码登录状态刷新
+    DeviceLoginChanged(DeviceLoginView),
+    /// Java 页快照（发行版/回退链/运行时）
+    JavaChanged(JavaPageView),
+    /// 安装进度（`None` = 清掉进度面板）
+    InstallProgress(Option<InstallProgressView>),
+    /// 设置分组刷新（设置页右栏）
+    SettingsChanged(Vec<SettingGroupView>),
+    /// 横幅通知刷新（隔离切换提示/启动失败等）
+    NoticesChanged(Vec<NoticeView>),
 }
 
 /// 统一事件队列的元素：core / agent / UI 自产（对话框、Toast）都走这一条路，
 /// 这样 [`crate::state::AppState::apply`] 是唯一的状态变更入口。
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub enum AppEvent {
     /// 来自 core
     Core(CoreEvent),
@@ -44,22 +94,56 @@ pub enum AppEvent {
 }
 
 /// app → core/agent 的用户意图。
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub enum AppCommand {
-    /// 重新扫描实例目录
-    RefreshInstances,
+    /// 重新扫描实例目录 + 全部页面快照（启动时与手改文件后）
+    RefreshAll,
     /// 启动实例
     LaunchInstance(InstanceId),
     /// 停止实例（含取消启动中的管线）
     StopInstance(InstanceId),
     /// 拉取某分类的版本列表
     ListVersions(VersionCategory),
-    /// 安装指定版本
+    /// 安装指定版本（下载页行内「安装」按钮；原版）
     InstallVersion(String),
+    /// 取消安装（阶段边界生效：当前阶段跑完就停，不再进下一阶段）
+    CancelInstall,
+    /// 新建实例（向导提交：版本 + 加载器 + 名字）
+    CreateInstance(CreateRequest),
+    /// 修改实例隔离档位（写实例设置文件）
+    SetIsolation {
+        /// 实例 id
+        id: InstanceId,
+        /// `isolated` / `shared`
+        mode: String,
+    },
     /// 刷新日志会话列表
     RefreshLogSessions,
     /// 打开某个会话（拉取日志行 + 触发诊断）
     OpenLogSession(SessionId),
+    /// 导入崩溃日志文件做规则分析（`hs_err_pid*.log` / `latest.log`）
+    ImportCrashLog(String),
+    /// 加一个离线账户
+    AddOfflineAccount(String),
+    /// 删除账户（按 id 或名字）
+    RemoveAccount(String),
+    /// 切换当前启动账户
+    SwitchAccount(String),
+    /// 开始微软设备码登录
+    StartDeviceLogin,
+    /// 取消/关掉设备码登录面板（已发出的请求会在收尾时丢弃结果）
+    CancelDeviceLogin,
+    /// 安装指定发行版的托管 JDK（`temurin` / `oracle` / `microsoft` / `zulu`）
+    InstallJava(String),
+    /// 写一条设置（`key` 必须是 core schema 里的键）
+    SetSetting {
+        /// schema 键
+        key: String,
+        /// 新值（字符串形态；host 按 schema 类型转换）
+        value: String,
+    },
+    /// 关掉一条横幅通知
+    DismissNotice(String),
     /// 向 AI 提问（会话状态在 app 侧，agent 只回事件）
     AskAgent(String),
     /// 中断当前 AI 流
@@ -68,7 +152,17 @@ pub enum AppCommand {
     SetYolo(bool),
 }
 
-/// 后端通道：core/agent host 实现它；P0 用 [`crate::mock::MockBackend`] 验证通道语义。
+impl AppCommand {
+    /// 构造「切换隔离档位」指令（磁贴/详情页共用）。
+    pub fn set_isolation(id: &str, mode: &str) -> Self {
+        Self::SetIsolation {
+            id: id.to_string(),
+            mode: mode.to_string(),
+        }
+    }
+}
+
+/// 后端通道：core/agent host 实现它；[`crate::mock::MockBackend`] 验证通道语义。
 ///
 /// 轮询模型（而非回调）是为了让 Slint 的定时器成为唯一调度者，
 /// 避免跨线程回调里碰 Slint 模型。
@@ -79,8 +173,63 @@ pub trait Backend {
     /// 下发一条用户意图。
     fn dispatch(&mut self, command: AppCommand);
 
-    /// 时间推进（mock 用脚本推进进度；真实后端可以是空实现）。
+    /// 时间推进（真实后端在这里收后台线程的结果并尾随日志）。
     fn tick(&mut self, elapsed: std::time::Duration) {
         let _ = elapsed;
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::dto::{AccountKind, DeviceLoginPhase, InstallStage};
+
+    #[test]
+    fn events_are_serializable_ipc_contracts() {
+        let event = AppEvent::Core(CoreEvent::InstallProgress(Some(InstallProgressView {
+            stage: InstallStage::Downloading,
+            files_done: 3,
+            files_total: 9,
+            ..InstallProgressView::new()
+        })));
+        let text = serde_json::to_string(&event).expect("序列化");
+        let back: AppEvent = serde_json::from_str(&text).expect("反序列化");
+        assert_eq!(back, event);
+
+        let account = AppEvent::Core(CoreEvent::AccountsChanged(vec![AccountView {
+            id: "account:1".to_string(),
+            name: "Steve".to_string(),
+            kind: AccountKind::Offline,
+            profile_id: "0f8f".to_string(),
+            login_name: String::new(),
+            created: "2026-10-31 20:12".to_string(),
+            active: true,
+        }]));
+        let text = serde_json::to_string(&account).expect("序列化");
+        let back: AppEvent = serde_json::from_str(&text).expect("反序列化");
+        assert_eq!(back, account);
+        // 凭据永不跨界：序列化文本里没有 token 类字段
+        assert!(!text.to_lowercase().contains("token"));
+    }
+
+    #[test]
+    fn commands_round_trip() {
+        let command = AppCommand::CreateInstance(CreateRequest {
+            version: "1.20.4".to_string(),
+            loader: crate::dto::LoaderKind::Fabric,
+            loader_version: "0.16.5".to_string(),
+            name: "生存".to_string(),
+        });
+        let text = serde_json::to_string(&command).expect("序列化");
+        let back: AppCommand = serde_json::from_str(&text).expect("反序列化");
+        assert_eq!(back, command);
+
+        let login = AppCommand::StartDeviceLogin;
+        assert_eq!(
+            serde_json::from_str::<AppCommand>(&serde_json::to_string(&login).expect("序列化"))
+                .expect("反序列化"),
+            login
+        );
+        assert!(DeviceLoginPhase::Waiting.busy());
+    }
+}

crates/app/src/dto/install.rs

@@ -0,0 +1,249 @@
+//! 安装进度 DTO：下载页与新建向导共用的「一个安装任务」视图。
+//!
+//! 只放聚合量（文件计数 / 字节 / 速度 / 剩余时间）+ 一行状态文案：
+//! 逐文件的明细留在 core 的 `InstallReport`，UI 不需要也不该持有。
+//! 速度与 ETA 由 host 依据相邻两次字节数差分算（core 的事件只给绝对值）。
+
+use serde::{Deserialize, Serialize};
+
+/// 安装阶段。
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum InstallStage {
+    /// 解析版本清单 / 规划文件（联网取 metadata）
+    Planning,
+    /// 下载并校验文件
+    Downloading,
+    /// 落版本 JSON / 跑安装器
+    Installing,
+    /// 登记实例
+    Registering,
+    /// 完成
+    Done,
+    /// 失败
+    Failed,
+    /// 用户取消
+    Cancelled,
+}
+
+impl InstallStage {
+    /// 阶段文案。
+    pub fn label(self) -> &'static str {
+        match self {
+            Self::Planning => "解析版本",
+            Self::Downloading => "下载文件",
+            Self::Installing => "写入版本",
+            Self::Registering => "登记实例",
+            Self::Done => "已完成",
+            Self::Failed => "失败",
+            Self::Cancelled => "已取消",
+        }
+    }
+
+    /// 是否已经收尾（Done/Failed/Cancelled）。
+    pub fn is_terminal(self) -> bool {
+        matches!(self, Self::Done | Self::Failed | Self::Cancelled)
+    }
+}
+
+/// 一次安装的进度快照。
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct InstallProgressView {
+    /// 目标版本 id
+    pub version: String,
+    /// 实例名（默认 = 版本 id）
+    pub instance: String,
+    /// 加载器徽标文字（`原版` / `Fabric 0.16.5`）
+    pub loader: String,
+    /// 阶段
+    pub stage: InstallStage,
+    /// 已完成文件数
+    pub files_done: u64,
+    /// 文件总数
+    pub files_total: u64,
+    /// 已下载字节
+    pub bytes_done: u64,
+    /// 总字节（0 = 未知）
+    pub bytes_total: u64,
+    /// 当前速度（字节/秒；0 = 未知）
+    pub speed_bps: u64,
+    /// 剩余秒数（0 = 未知）
+    pub eta_secs: u64,
+    /// 状态/错误文案
+    pub message: String,
+}
+
+impl Default for InstallProgressView {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl InstallProgressView {
+    /// 规划中的空快照。
+    pub fn new() -> Self {
+        Self {
+            version: String::new(),
+            instance: String::new(),
+            loader: String::new(),
+            stage: InstallStage::Planning,
+            files_done: 0,
+            files_total: 0,
+            bytes_done: 0,
+            bytes_total: 0,
+            speed_bps: 0,
+            eta_secs: 0,
+            message: String::new(),
+        }
+    }
+
+    /// 起一个任务的快照。
+    pub fn start(version: &str, instance: &str, loader: &str) -> Self {
+        Self {
+            version: version.to_string(),
+            instance: instance.to_string(),
+            loader: loader.to_string(),
+            stage: InstallStage::Planning,
+            message: "正在解析版本清单…".to_string(),
+            ..Self::new()
+        }
+    }
+
+    /// 整体进度 0.0~1.0（优先文件计数，其次字节；都没有时 0）。
+    pub fn ratio(&self) -> f32 {
+        if self.files_total > 0 {
+            (self.files_done as f32 / self.files_total as f32).clamp(0.0, 1.0)
+        } else if self.bytes_total > 0 {
+            (self.bytes_done as f32 / self.bytes_total as f32).clamp(0.0, 1.0)
+        } else {
+            0.0
+        }
+    }
+
+    /// 进度是否已知（未知时进度条转不确定态）。
+    pub fn is_known(&self) -> bool {
+        self.files_total > 0 || self.bytes_total > 0
+    }
+
+    /// 速度文案（`1.2 MB/s`；未知给空串）。
+    pub fn speed_label(&self) -> String {
+        if self.speed_bps == 0 {
+            return String::new();
+        }
+        format!("{}/s", human_bytes(self.speed_bps))
+    }
+
+    /// 剩余时间文案（`剩 12s`；未知给空串）。
+    pub fn eta_label(&self) -> String {
+        if self.eta_secs == 0 {
+            return String::new();
+        }
+        if self.eta_secs >= 60 {
+            format!("剩 {}m{:02}s", self.eta_secs / 60, self.eta_secs % 60)
+        } else {
+            format!("剩 {}s", self.eta_secs)
+        }
+    }
+
+    /// 文件计数文案（`128/512 文件`）。
+    pub fn files_label(&self) -> String {
+        if self.files_total == 0 {
+            return String::new();
+        }
+        format!("{}/{} 文件", self.files_done, self.files_total)
+    }
+}
+
+/// 字节数 → 人读（`1.2 MB`）。
+pub fn human_bytes(bytes: u64) -> String {
+    const UNITS: [&str; 5] = ["B", "KB", "MB", "GB", "TB"];
+    let mut value = bytes as f64;
+    let mut unit = 0;
+    while value >= 1024.0 && unit + 1 < UNITS.len() {
+        value /= 1024.0;
+        unit += 1;
+    }
+    if unit == 0 {
+        format!("{bytes} B")
+    } else {
+        format!("{value:.1} {}", UNITS[unit])
+    }
+}
+
+/// 用相邻两次采样算速度与 ETA（`None` = 本次无法计算，保持上次值）。
+pub fn derive_speed(
+    previous: (u64, std::time::Instant),
+    current: (u64, std::time::Instant),
+    bytes_total: u64,
+) -> Option<(u64, u64)> {
+    let elapsed = current.1.saturating_duration_since(previous.1);
+    if elapsed.as_millis() < 50 {
+        return None;
+    }
+    let delta = current.0.saturating_sub(previous.0);
+    if delta == 0 {
+        return None;
+    }
+    let elapsed_ms = u64::try_from(elapsed.as_millis()).unwrap_or(u64::MAX);
+    let speed = delta.saturating_mul(1000) / elapsed_ms.max(1);
+    let eta = if bytes_total > current.0 && speed > 0 {
+        (bytes_total - current.0) / speed
+    } else {
+        0
+    };
+    Some((speed, eta))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::time::{Duration, Instant};
+
+    #[test]
+    fn ratio_prefers_file_counts() {
+        let mut view = InstallProgressView::start("1.20.4", "1.20.4", "原版");
+        assert_eq!(view.ratio(), 0.0);
+        assert!(!view.is_known());
+
+        view.files_total = 4;
+        view.files_done = 1;
+        view.bytes_total = 1000;
+        view.bytes_done = 900;
+        assert!((view.ratio() - 0.25).abs() < f32::EPSILON);
+        assert!(view.is_known());
+        assert_eq!(view.files_label(), "1/4 文件");
+    }
+
+    #[test]
+    fn speed_and_eta_labels_are_human_readable() {
+        let view = InstallProgressView {
+            speed_bps: 1_258_291,
+            eta_secs: 75,
+            ..InstallProgressView::new()
+        };
+        assert_eq!(view.speed_label(), "1.2 MB/s");
+        assert_eq!(view.eta_label(), "剩 1m15s");
+        assert_eq!(InstallProgressView::new().speed_label(), "");
+    }
+
+    #[test]
+    fn derive_speed_needs_a_measurable_delta() {
+        let start = Instant::now();
+        let previous = (0, start);
+        // 间隔太短 → 不算
+        assert!(derive_speed(previous, (500, start + Duration::from_millis(10)), 1000).is_none());
+        // 正常差分：1s 下 500 字节 → 500 B/s，剩 500 字节 → 1s
+        let (speed, eta) =
+            derive_speed(previous, (500, start + Duration::from_secs(1)), 1000).expect("应能算");
+        assert_eq!(speed, 500);
+        assert_eq!(eta, 1);
+    }
+
+    #[test]
+    fn terminal_stages() {
+        assert!(InstallStage::Done.is_terminal());
+        assert!(InstallStage::Failed.is_terminal());
+        assert!(!InstallStage::Downloading.is_terminal());
+        assert_eq!(human_bytes(512), "512 B");
+        assert_eq!(human_bytes(2048), "2.0 KB");
+    }
+}

crates/app/src/dto/instances.rs

@@ -1,12 +1,14 @@
 //! 实例相关 DTO：磁贴与列表视图的唯一数据源。
 
+use serde::{Deserialize, Serialize};
+
 use std::path::PathBuf;
 
 /// 实例标识：core::game 生成的稳定 id，app 视为不透明字符串。
 pub type InstanceId = String;
 
 /// 加载器种类（磁贴徽标 + 详情页版本链）。
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
 pub enum LoaderKind {
     /// 原版（无加载器）
     Vanilla,
@@ -37,10 +39,48 @@ impl LoaderKind {
             Self::LiteLoader => "LiteLoader",
         }
     }
+
+    /// 稳定 id（`vanilla` / `fabric` / …；GUI 与 CLI 的 `--loader` 同词表）。
+    pub fn as_str(self) -> &'static str {
+        match self {
+            Self::Vanilla => "vanilla",
+            Self::Fabric => "fabric",
+            Self::Quilt => "quilt",
+            Self::Forge => "forge",
+            Self::NeoForge => "neoforge",
+            Self::OptiFine => "optifine",
+            Self::LiteLoader => "liteloader",
+        }
+    }
+
+    /// 从稳定 id 解析（未知给 `None`，由调用方决定报错文案）。
+    pub fn parse(raw: &str) -> Option<Self> {
+        Some(match raw.trim().to_ascii_lowercase().as_str() {
+            "vanilla" | "none" | "" => Self::Vanilla,
+            "fabric" => Self::Fabric,
+            "quilt" => Self::Quilt,
+            "forge" => Self::Forge,
+            "neoforge" => Self::NeoForge,
+            "optifine" => Self::OptiFine,
+            "liteloader" => Self::LiteLoader,
+            _ => return None,
+        })
+    }
+
+    /// 向导里的可选加载器（顺序即展示顺序）。
+    pub fn wizard_choices() -> [Self; 5] {
+        [
+            Self::Vanilla,
+            Self::Fabric,
+            Self::Quilt,
+            Self::Forge,
+            Self::NeoForge,
+        ]
+    }
 }
 
 /// 加载器 + 版本（例如 Fabric 0.16.5）。
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct LoaderInfo {
     /// 加载器种类
     pub kind: LoaderKind,
@@ -48,6 +88,15 @@ pub struct LoaderInfo {
     pub version: String,
 }
 
+impl Default for LoaderInfo {
+    fn default() -> Self {
+        Self {
+            kind: LoaderKind::Vanilla,
+            version: String::new(),
+        }
+    }
+}
+
 impl LoaderInfo {
     /// 徽标文字：原版只写「原版」，装加载器时写「Fabric 0.16.5」。
     pub fn badge(&self) -> String {
@@ -60,7 +109,7 @@ impl LoaderInfo {
 }
 
 /// 字节进度；`total == 0` 表示总量未知（UI 转不确定态）。
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default, Serialize, Deserialize)]
 pub struct Progress {
     /// 已完成量
     pub done: u64,
@@ -85,7 +134,7 @@ impl Progress {
 }
 
 /// 启动管线阶段（磁贴进度环的文案来源；D8 的 10 阶段在 P1 细化）。
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
 pub enum LaunchStage {
     /// 下载资源
     Download,
@@ -93,6 +142,8 @@ pub enum LaunchStage {
     Verify,
     /// 组装命令行并拉起进程
     Launch,
+    /// 进程已起、等待游戏窗口（M28 的窗口检测阶段）
+    Window,
 }
 
 impl LaunchStage {
@@ -101,13 +152,14 @@ impl LaunchStage {
         match self {
             Self::Download => "下载资源",
             Self::Verify => "校验文件",
-            Self::Launch => "启动中",
+            Self::Launch => "组装命令行",
+            Self::Window => "等待窗口",
         }
     }
 }
 
 /// 实例运行时状态（磁贴的四种外观）。
-#[derive(Debug, Clone, PartialEq, Eq, Default)]
+#[derive(Debug, Clone, PartialEq, Eq, Default, Serialize, Deserialize)]
 pub enum InstanceRuntime {
     /// 空闲
     #[default]
@@ -132,7 +184,7 @@ pub enum InstanceRuntime {
 }
 
 /// 实例摘要：磁贴/列表视图唯一数据源。
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub struct InstanceSummary {
     /// 稳定 id
     pub id: InstanceId,
@@ -148,4 +200,97 @@ pub struct InstanceSummary {
     pub runtime: InstanceRuntime,
     /// 实例图标路径（P0 直接给路径；P1 换成 core 提供的图像句柄）
     pub icon: Option<PathBuf>,
+    /// 隔离档位（`isolated` / `shared` / `custom`；未知为空）
+    pub isolation: String,
+    /// 该实例绑定的版本 id（详情页/启动用）
+    pub version_id: String,
+    /// 版本本体是否在盘上（缺载荷时磁贴亮黄条）
+    pub version_present: bool,
+}
+
+/// 新建实例向导提交给 host 的请求（已通过向导校验）。
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct CreateRequest {
+    /// 目标原版版本 id（`1.20.4`）
+    pub version: String,
+    /// 加载器
+    pub loader: LoaderKind,
+    /// 加载器版本（空 = 让 core 取最新）
+    pub loader_version: String,
+    /// 实例名（空 = 用版本 id / 加载器版本 id）
+    pub name: String,
+}
+
+impl CreateRequest {
+    /// 实际使用的实例名。
+    pub fn instance_name(&self) -> String {
+        if self.name.trim().is_empty() {
+            self.version.clone()
+        } else {
+            self.name.trim().to_string()
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn loader_badges_and_ids() {
+        let vanilla = LoaderInfo::default();
+        assert_eq!(vanilla.badge(), "原版");
+        let fabric = LoaderInfo {
+            kind: LoaderKind::Fabric,
+            version: "0.16.5".to_string(),
+        };
+        assert_eq!(fabric.badge(), "Fabric 0.16.5");
+        for kind in LoaderKind::wizard_choices() {
+            assert_eq!(LoaderKind::parse(kind.as_str()), Some(kind));
+        }
+        assert_eq!(LoaderKind::parse("fabric"), Some(LoaderKind::Fabric));
+        assert_eq!(LoaderKind::parse("unknown"), None);
+    }
+
+    #[test]
+    fn progress_ratio_handles_unknown_total() {
+        assert_eq!(Progress { done: 1, total: 0 }.ratio(), 0.0);
+        assert!((Progress { done: 1, total: 4 }.ratio() - 0.25).abs() < f32::EPSILON);
+    }
+
+    #[test]
+    fn create_request_defaults_name_to_version() {
+        let request = CreateRequest {
+            version: "1.20.4".to_string(),
+            loader: LoaderKind::Vanilla,
+            loader_version: String::new(),
+            name: "  ".to_string(),
+        };
+        assert_eq!(request.instance_name(), "1.20.4");
+    }
+
+    #[test]
+    fn instance_summary_is_serde_round_trip_safe() {
+        let instance = InstanceSummary {
+            id: "inst-1".to_string(),
+            name: "生存".to_string(),
+            mc_version: "1.20.4".to_string(),
+            loader: LoaderInfo {
+                kind: LoaderKind::Fabric,
+                version: "0.16.5".to_string(),
+            },
+            last_played: Some("2026-10-31T12:00:00.000Z".to_string()),
+            runtime: InstanceRuntime::Busy {
+                stage: LaunchStage::Window,
+                progress: Progress { done: 1, total: 2 },
+            },
+            icon: None,
+            isolation: "isolated".to_string(),
+            version_id: "1.20.4".to_string(),
+            version_present: true,
+        };
+        let text = serde_json::to_string(&instance).expect("序列化");
+        let back: InstanceSummary = serde_json::from_str(&text).expect("反序列化");
+        assert_eq!(back, instance);
+    }
 }

crates/app/src/dto/java.rs

@@ -0,0 +1,234 @@
+//! Java 页 DTO：四家发行版、回退链可视化与本地运行时清单（D23/D13）。
+//!
+//! 回退链是「可观测性」的载体：安装失败时用户要能看见「Temurin 跳过 → Oracle 失败 →
+//! Microsoft 命中」这条链，而不是只拿到一句「下载失败」。链的每一步由 host 从
+//! `core::game::java::source::ChainLog` 翻译过来。
+
+use serde::{Deserialize, Serialize};
+
+/// 一家发行版的展示行。
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct JavaVendorView {
+    /// 稳定 id（`temurin` / `oracle` / `microsoft` / `zulu`）
+    pub id: String,
+    /// 展示名
+    pub display: String,
+    /// 优先级序号（1 起）
+    pub rank: u32,
+    /// 支持的 Java 大版本摘要（`21/17/11`）
+    pub majors: String,
+    /// 可用源（镜像 + 吞吐备注）
+    pub sources: Vec<String>,
+    /// 是否已装过这家（托管目录里有现成的）
+    pub installed: bool,
+}
+
+/// 回退链一步的结局。
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum JavaChainOutcome {
+    /// 还没尝试（安装前的计划链）
+    Pending,
+    /// 跳过（不支持目标大版本）
+    Skip,
+    /// 尝试过但失败
+    Failed,
+    /// 命中（下载/安装成功）
+    Hit,
+}
+
+impl JavaChainOutcome {
+    /// 徽标文字。
+    pub fn label(self) -> &'static str {
+        match self {
+            Self::Pending => "待尝试",
+            Self::Skip => "跳过",
+            Self::Failed => "失败",
+            Self::Hit => "命中",
+        }
+    }
+
+    /// 从 core 的 `VendorAttempt` 结局字符串解析。
+    pub fn parse(raw: &str) -> Self {
+        match raw {
+            "hit" => Self::Hit,
+            "failed" => Self::Failed,
+            "skip" | "skipped" => Self::Skip,
+            _ => Self::Pending,
+        }
+    }
+}
+
+/// 回退链一步。
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct JavaChainStep {
+    /// 发行版 id
+    pub vendor: String,
+    /// 结局
+    pub outcome: JavaChainOutcome,
+    /// 细节（跳过原因 / 失败摘要 / 命中的下载源）
+    pub detail: String,
+}
+
+/// 本地已发现的 Java 运行时。
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct JavaRuntimeView {
+    /// 可执行文件路径
+    pub binary: String,
+    /// 版本串（`17.0.9`）
+    pub version: String,
+    /// 大版本
+    pub major: u32,
+    /// 发行方
+    pub vendor: String,
+    /// 来源分类（system / managed / instance）
+    pub origin: String,
+}
+
+/// Java 页快照（一次事件整体替换）。
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct JavaPageView {
+    /// 地区判定（`domestic` / `global`）
+    pub region: String,
+    /// 优先级的来源（`region_default` / `java.vendorPriority`）
+    pub priority_source: String,
+    /// 生效顺序（`temurin → oracle → microsoft → zulu`）
+    pub order_text: String,
+    /// 四家展示行（按生效顺序）
+    pub vendors: Vec<JavaVendorView>,
+    /// 回退链（计划链或上一次安装的真实链）
+    pub chain: Vec<JavaChainStep>,
+    /// 本地运行时
+    pub runtimes: Vec<JavaRuntimeView>,
+    /// 托管目录
+    pub managed_roots: Vec<String>,
+    /// 是否有 Java 安装在跑
+    pub busy: bool,
+    /// 状态/错误文案
+    pub message: String,
+}
+
+impl Default for JavaPageView {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl JavaPageView {
+    /// 空态（托管目录还没扫到东西）。
+    pub fn new() -> Self {
+        Self {
+            region: "global".to_string(),
+            priority_source: "region_default".to_string(),
+            order_text: String::new(),
+            vendors: Vec::new(),
+            chain: Vec::new(),
+            runtimes: Vec::new(),
+            managed_roots: Vec::new(),
+            busy: false,
+            message: String::new(),
+        }
+    }
+
+    /// 计划链：按生效顺序铺一排「待尝试」（安装前的可视化）。
+    pub fn planned_chain(vendors: &[JavaVendorView]) -> Vec<JavaChainStep> {
+        vendors
+            .iter()
+            .map(|vendor| JavaChainStep {
+                vendor: vendor.id.clone(),
+                outcome: JavaChainOutcome::Pending,
+                detail: String::new(),
+            })
+            .collect()
+    }
+
+    /// 命中的那一家的展示名（`None` = 链上还没命中）。
+    pub fn hit_vendor(&self) -> Option<&str> {
+        self.chain
+            .iter()
+            .find(|step| step.outcome == JavaChainOutcome::Hit)
+            .map(|step| step.vendor.as_str())
+    }
+
+    /// 已安装的大版本列表（去重升序）。
+    pub fn majors(&self) -> Vec<u32> {
+        let mut majors: Vec<u32> = self.runtimes.iter().map(|runtime| runtime.major).collect();
+        majors.sort_unstable();
+        majors.dedup();
+        majors
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn vendor(id: &str, rank: u32) -> JavaVendorView {
+        JavaVendorView {
+            id: id.to_string(),
+            display: id.to_uppercase(),
+            rank,
+            majors: "21/17".to_string(),
+            sources: Vec::new(),
+            installed: false,
+        }
+    }
+
+    #[test]
+    fn planned_chain_is_all_pending_in_rank_order() {
+        let vendors = vec![vendor("temurin", 1), vendor("oracle", 2)];
+        let chain = JavaPageView::planned_chain(&vendors);
+        assert_eq!(chain.len(), 2);
+        assert!(chain
+            .iter()
+            .all(|step| step.outcome == JavaChainOutcome::Pending));
+        assert_eq!(chain[0].vendor, "temurin");
+    }
+
+    #[test]
+    fn hit_vendor_finds_the_hit_step() {
+        let mut page = JavaPageView::new();
+        page.chain = vec![
+            JavaChainStep {
+                vendor: "temurin".to_string(),
+                outcome: JavaChainOutcome::Skip,
+                detail: "不支持 8".to_string(),
+            },
+            JavaChainStep {
+                vendor: "oracle".to_string(),
+                outcome: JavaChainOutcome::Hit,
+                detail: "BMCLAPI".to_string(),
+            },
+        ];
+        assert_eq!(page.hit_vendor(), Some("oracle"));
+    }
+
+    #[test]
+    fn outcome_parses_core_words() {
+        assert_eq!(JavaChainOutcome::parse("hit"), JavaChainOutcome::Hit);
+        assert_eq!(JavaChainOutcome::parse("failed"), JavaChainOutcome::Failed);
+        assert_eq!(JavaChainOutcome::parse("skip"), JavaChainOutcome::Skip);
+        assert_eq!(JavaChainOutcome::parse("?"), JavaChainOutcome::Pending);
+    }
+
+    #[test]
+    fn majors_are_deduped_and_sorted() {
+        let mut page = JavaPageView::new();
+        page.runtimes = vec![
+            JavaRuntimeView {
+                binary: "a".to_string(),
+                version: "17".to_string(),
+                major: 17,
+                vendor: "Temurin".to_string(),
+                origin: "managed".to_string(),
+            },
+            JavaRuntimeView {
+                binary: "b".to_string(),
+                version: "17".to_string(),
+                major: 17,
+                vendor: "Oracle".to_string(),
+                origin: "system".to_string(),
+            },
+        ];
+        assert_eq!(page.majors(), vec![17]);
+    }
+}

crates/app/src/dto/logs.rs

@@ -1,10 +1,12 @@
 //! 日志页 DTO：会话列表、日志行与 D8 诊断结论。
 
+use serde::{Deserialize, Serialize};
+
 /// 一次启动会话（日志页左栏单位）标识。
 pub type SessionId = String;
 
 /// 一次运行的结局（G3 左栏图标：✓ 正常 / ✗ 崩溃 / ⚠ 静默失败）。
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
 pub enum LogOutcome {
     /// 正常退出
     Ok,
@@ -15,7 +17,7 @@ pub enum LogOutcome {
 }
 
 /// 会话摘要。
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct LogSession {
     /// 会话 id
     pub id: SessionId,
@@ -30,7 +32,7 @@ pub struct LogSession {
 }
 
 /// 日志行等级（错误行高亮）。
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
 pub enum LogLevel {
     /// debug
     Debug,
@@ -43,7 +45,7 @@ pub enum LogLevel {
 }
 
 /// 一行日志。
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct LogLine {
     /// 原始文本（含时间戳前缀）
     pub text: String,
@@ -52,7 +54,7 @@ pub struct LogLine {
 }
 
 /// D8 规则引擎结论（日志页崩溃诊断卡片）。
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct Diagnosis {
     /// 命中规则 id（`gpu.driver_old`）
     pub rule: String,
@@ -67,7 +69,7 @@ pub struct Diagnosis {
 }
 
 /// 诊断结论 + 归属会话（UI 用它决定卡片显隐）。
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct DiagnosisReport {
     /// 归属会话
     pub session: SessionId,

crates/app/src/dto/mod.rs

@@ -2,22 +2,38 @@
 //!
 //! 这里只允许出现「扁平 DTO / 事件 / 指令」：`crates/app` 任何模块都不得 `use unlucky_core::*`
 //! 或 `use unlucky_agent::*` 的内部类型。core/agent 侧的 host 层负责把自身类型翻译成本模块的类型，
-//! 反向的 [`AppCommand`] 也一样。P0 阶段由 [`crate::mock`] 的假后端实现 [`Backend`] 驱动骨架。
+//! 反向的 [`AppCommand`] 也一样。P0 阶段由 [`crate::mock`] 的假后端实现 [`Backend`] 驱动骨架，
+//! P3 起由 [`crate::host`] 的真实后端驱动全部页面。
 //!
-//! 结构：**按领域拆子模块**（instances / versions / logs / agent / events），
-//! 全量 `pub use` 出去，调用方依旧写 `crate::dto::InstanceSummary` 这类路径。
+//! 结构：**按领域拆子模块**（instances / versions / logs / agent / accounts / java /
+//! settings / install / notices / events），全量 `pub use` 出去，调用方依旧写
+//! `crate::dto::InstanceSummary` 这类路径。
 //! 契约说明（字段口径、事件顺序、错误语义）见 `DevDocs/SubAgentsTalk/app-DTO通道约定.md`。
+//!
+//! 全部跨界类型 `Serialize + Deserialize`（AGENTS §6）：事件与快照是 IPC 契约，
+//! 序列化能力由 derive 钉住，`dto` 的单测做 round-trip 断言。
 
+mod accounts;
 mod agent;
 mod events;
+mod install;
 mod instances;
+mod java;
 mod logs;
+mod notices;
+mod settings;
 mod versions;
 
+pub use accounts::{AccountKind, AccountView, DeviceLoginPhase, DeviceLoginView};
 pub use agent::{AgentEvent, ChatMessage, ChatRole, ToolCallView};
-pub use events::{AppCommand, AppEvent, Backend, CoreEvent};
+pub use events::{AppCommand, AppEvent, Backend, CoreEvent, LaunchFinished, LiveLogBatch};
+pub use install::{derive_speed, human_bytes, InstallProgressView, InstallStage};
 pub use instances::{
-    InstanceId, InstanceRuntime, InstanceSummary, LaunchStage, LoaderInfo, LoaderKind, Progress,
+    CreateRequest, InstanceId, InstanceRuntime, InstanceSummary, LaunchStage, LoaderInfo,
+    LoaderKind, Progress,
 };
+pub use java::{JavaChainOutcome, JavaChainStep, JavaPageView, JavaRuntimeView, JavaVendorView};
 pub use logs::{Diagnosis, DiagnosisReport, LogLevel, LogLine, LogOutcome, LogSession, SessionId};
+pub use notices::{NoticeLevel, NoticeView};
+pub use settings::{SettingControl, SettingGroupView, SettingRowView};
 pub use versions::{AncientKind, VersionCategory, VersionKind, VersionSummary};

crates/app/src/dto/notices.rs

@@ -0,0 +1,73 @@
+//! 横幅通知 DTO：实例页/下载页顶部的「需要注意」提示条。
+//!
+//! 与 Toast 的分工：Toast 是「刚才发生了什么」（3 秒消失），通知条是
+//! 「现在需要你处理」（用户点了才收）。隔离模式切换提示（M30 `ModeChangeWarning`）
+//! 与启动失败都用它。
+
+use serde::{Deserialize, Serialize};
+
+/// 通知级别。
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum NoticeLevel {
+    /// 一般信息
+    Info,
+    /// 需要留意（黄条）
+    Warn,
+    /// 失败（红条）
+    Error,
+}
+
+impl NoticeLevel {
+    /// 级别文案（无障碍/测试用）。
+    pub fn label(self) -> &'static str {
+        match self {
+            Self::Info => "信息",
+            Self::Warn => "注意",
+            Self::Error => "错误",
+        }
+    }
+}
+
+/// 一条通知。
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct NoticeView {
+    /// 稳定 id（关闭时按它移除）
+    pub id: String,
+    /// 级别
+    pub level: NoticeLevel,
+    /// 标题
+    pub title: String,
+    /// 正文
+    pub body: String,
+}
+
+impl NoticeView {
+    /// 建一条。
+    pub fn new(id: &str, level: NoticeLevel, title: &str, body: &str) -> Self {
+        Self {
+            id: id.to_string(),
+            level,
+            title: title.to_string(),
+            body: body.to_string(),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn notices_are_serde_round_trip_safe() {
+        let notice = NoticeView::new(
+            "isolation:demo",
+            NoticeLevel::Warn,
+            "隔离模式已切换",
+            "旧目录里还有 mods/saves",
+        );
+        let text = serde_json::to_string(&notice).expect("序列化");
+        let back: NoticeView = serde_json::from_str(&text).expect("反序列化");
+        assert_eq!(back, notice);
+        assert_eq!(back.level.label(), "注意");
+    }
+}

crates/app/src/dto/settings.rs

@@ -0,0 +1,220 @@
+//! 设置页 DTO：设置分组的通用行模型。
+//!
+//! 「行」是 UI 与 `core::setting` schema 之间的唯一形状：一行 = 一个键 + 一种控件 +
+//! 当前值。写回走 [`crate::dto::AppCommand::SetSetting`]，由 host 用 `SettingStore::set`
+//! 落盘（不自己拼 JSON、不另立配置文件，`AGENTS §6`）。
+
+use serde::{Deserialize, Serialize};
+
+/// 控件类型（决定设置页画什么）。
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum SettingControl {
+    /// 开关
+    Toggle,
+    /// 分段单选（`options` + `selected`）
+    Choice,
+    /// 单行文本（`value_text`）
+    Text,
+    /// 只读展示（当前路径/当前版本这类）
+    ReadOnly,
+    /// 动作按钮（`action` 给回调 id）
+    Action,
+}
+
+/// 一行设置。
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct SettingRowView {
+    /// schema 键（`download.concurrency`）
+    pub key: String,
+    /// 行标题
+    pub label: String,
+    /// 说明/当前值附注
+    pub description: String,
+    /// 控件
+    pub control: SettingControl,
+    /// 开关值
+    pub flag: bool,
+    /// 单选序号
+    pub selected: i32,
+    /// 单选项文案
+    pub options: Vec<String>,
+    /// 文本值
+    pub value_text: String,
+    /// 动作 id（`detect_region` 这类）
+    pub action: String,
+}
+
+impl SettingRowView {
+    /// 开关行。
+    pub fn toggle(key: &str, label: &str, description: &str, value: bool) -> Self {
+        Self {
+            key: key.to_string(),
+            label: label.to_string(),
+            description: description.to_string(),
+            control: SettingControl::Toggle,
+            flag: value,
+            selected: 0,
+            options: Vec::new(),
+            value_text: String::new(),
+            action: String::new(),
+        }
+    }
+
+    /// 单选行。
+    pub fn choice(
+        key: &str,
+        label: &str,
+        description: &str,
+        options: &[&str],
+        selected: i32,
+    ) -> Self {
+        Self {
+            key: key.to_string(),
+            label: label.to_string(),
+            description: description.to_string(),
+            control: SettingControl::Choice,
+            flag: false,
+            selected,
+            options: options.iter().map(|item| (*item).to_string()).collect(),
+            value_text: String::new(),
+            action: String::new(),
+        }
+    }
+
+    /// 文本行。
+    pub fn text(key: &str, label: &str, description: &str, value: &str) -> Self {
+        Self {
+            key: key.to_string(),
+            label: label.to_string(),
+            description: description.to_string(),
+            control: SettingControl::Text,
+            flag: false,
+            selected: 0,
+            options: Vec::new(),
+            value_text: value.to_string(),
+            action: String::new(),
+        }
+    }
+
+    /// 只读行。
+    pub fn read_only(label: &str, value: &str) -> Self {
+        Self {
+            key: String::new(),
+            label: label.to_string(),
+            description: value.to_string(),
+            control: SettingControl::ReadOnly,
+            flag: false,
+            selected: 0,
+            options: Vec::new(),
+            value_text: value.to_string(),
+            action: String::new(),
+        }
+    }
+
+    /// 动作行。
+    pub fn action(key: &str, label: &str, description: &str, action: &str) -> Self {
+        Self {
+            key: key.to_string(),
+            label: label.to_string(),
+            description: description.to_string(),
+            control: SettingControl::Action,
+            flag: false,
+            selected: 0,
+            options: Vec::new(),
+            value_text: String::new(),
+            action: action.to_string(),
+        }
+    }
+}
+
+/// 一个设置分组（设置页右栏的一段）。
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct SettingGroupView {
+    /// 分组 id（与设置页子导航的 `SettingSection` 同名：download / java / data / ai / mcp）
+    pub id: String,
+    /// 分组标题
+    pub title: String,
+    /// 行
+    pub rows: Vec<SettingRowView>,
+}
+
+impl SettingGroupView {
+    /// 建组。
+    pub fn new(id: &str, title: &str) -> Self {
+        Self {
+            id: id.to_string(),
+            title: title.to_string(),
+            rows: Vec::new(),
+        }
+    }
+
+    /// 追加一行（链式）。
+    pub fn with(mut self, row: SettingRowView) -> Self {
+        self.rows.push(row);
+        self
+    }
+}
+
+/// 在分组快照里找一个键的当前值（设置页回填用）。
+pub fn find_row<'a>(groups: &'a [SettingGroupView], key: &str) -> Option<&'a SettingRowView> {
+    groups
+        .iter()
+        .flat_map(|group| group.rows.iter())
+        .find(|row| row.key == key)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn rows_carry_exactly_one_control_kind() {
+        let toggle = SettingRowView::toggle("agent.mcp.enabled", "MCP", "", true);
+        assert_eq!(toggle.control, SettingControl::Toggle);
+        assert!(toggle.flag);
+
+        let choice = SettingRowView::choice("download.region", "地区", "", &["auto", "cn"], 1);
+        assert_eq!(choice.options, vec!["auto", "cn"]);
+        assert_eq!(choice.selected, 1);
+
+        let action = SettingRowView::action("java.action", "检测", "", "detect_region");
+        assert_eq!(action.action, "detect_region");
+    }
+
+    #[test]
+    fn find_row_scans_all_groups() {
+        let groups = vec![
+            SettingGroupView::new("download", "下载").with(SettingRowView::text(
+                "download.proxy_url",
+                "代理",
+                "",
+                "",
+            )),
+            SettingGroupView::new("mcp", "MCP").with(SettingRowView::toggle(
+                "agent.mcp.enabled",
+                "开关",
+                "",
+                false,
+            )),
+        ];
+        assert_eq!(
+            find_row(&groups, "agent.mcp.enabled").map(|row| row.label.as_str()),
+            Some("开关")
+        );
+        assert!(find_row(&groups, "nope").is_none());
+    }
+
+    #[test]
+    fn rows_are_serde_round_trip_safe() {
+        let group = SettingGroupView::new("download", "下载").with(SettingRowView::choice(
+            "download.concurrency",
+            "并发",
+            "",
+            &["4", "8", "16"],
+            1,
+        ));
+        let text = serde_json::to_string(&group).expect("序列化");
+        let back: SettingGroupView = serde_json::from_str(&text).expect("反序列化");
+        assert_eq!(back, group);
+    }
+}

crates/app/src/dto/versions.rs

@@ -1,7 +1,9 @@
 //! 下载页 DTO：版本列表与分类（含远古版子类，D16/Q24-4）。
 
+use serde::{Deserialize, Serialize};
+
 /// 版本类型（远古版按 unlisted-versions 的分类拆开）。
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
 pub enum VersionKind {
     /// 正式版
     Release,
@@ -12,7 +14,7 @@ pub enum VersionKind {
 }
 
 /// 远古版子类。
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
 pub enum AncientKind {
     /// classic（rd-*）
     Classic,
@@ -32,7 +34,7 @@ impl VersionKind {
 }
 
 /// 下载页版本行。
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct VersionSummary {
     /// 版本 id（如 `1.20.4` / `rd-132211`）
     pub id: String,
@@ -45,7 +47,7 @@ pub struct VersionSummary {
 }
 
 /// 下载页左侧分类（页内常驻侧栏的选中项）。
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
 pub enum VersionCategory {
     /// 正式版
     Release,

crates/app/src/host/accounts.rs

@@ -0,0 +1,237 @@
+//! 账户：三轨统一列表（只读公开字段）+ 离线新增 + 删除/切换 + 微软设备码登录。
+//!
+//! 凭据红线（D9）：`Credentials` / `MicrosoftSession` 只在本模块与 `launch.rs` 里出现，
+//! 出口一律是 [`AccountView`] / [`DeviceLoginView`]。设备码本身不是凭据，可以直接展示。
+//!
+//! 取消语义：设备码轮询跑在 `core` 里、没有取消钩子，所以取消只把面板收回；线程收尾时
+//! 若发现「已取消」就不入库（避免用户点了取消却凭空多出一个账户）。
+
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::Arc;
+
+use unlucky_core::auth::account::Credentials;
+use unlucky_core::auth::microsoft::{now_ms, MicrosoftAuth};
+use unlucky_core::auth::offline::offline_meta;
+use unlucky_core::auth::AccountStore;
+use unlucky_core::download::blocking::block_on;
+
+use crate::dto::{AccountKind, AccountView, DeviceLoginView};
+
+use super::env::HostEnv;
+use super::job::{spawn, HostTask, JobSender};
+
+/// 账户列表（公开字段）。
+pub fn accounts(env: &HostEnv, active: Option<&str>) -> Vec<AccountView> {
+    let store = AccountStore::open(env.layout.auth_data());
+    store
+        .accounts()
+        .iter()
+        .map(|meta| AccountView {
+            id: meta.id.as_str().to_string(),
+            name: meta.display_name().to_string(),
+            kind: AccountKind::parse(meta.kind.as_str()),
+            profile_id: meta.profile_id.clone(),
+            login_name: meta.login_name.clone().unwrap_or_default(),
+            created: display_ms(meta.created_at_ms),
+            active: active.is_some_and(|id| id == meta.id.as_str()),
+        })
+        .collect()
+}
+
+/// 毫秒时间戳 → `2026-10-31 20:12`（UTC；账户列表只用来排序/辨认）。
+pub fn display_ms(ms: u64) -> String {
+    if ms == 0 {
+        return String::new();
+    }
+    let total_secs = ms / 1000;
+    let days = total_secs / 86_400;
+    let rem = total_secs % 86_400;
+    let (year, month, day) = civil_from_days(i64::try_from(days).unwrap_or(0));
+    format!(
+        "{year:04}-{month:02}-{day:02} {:02}:{:02}",
+        rem / 3_600,
+        (rem % 3_600) / 60
+    )
+}
+
+/// Howard Hinnant 的 `civil_from_days`（1970-01-01 为 0）。
+fn civil_from_days(days: i64) -> (i64, u32, u32) {
+    let z = days + 719_468;
+    let era = if z >= 0 { z } else { z - 146_096 } / 146_097;
+    let doe = z - era * 146_097;
+    let yoe = (doe - doe / 1_460 + doe / 36_524 - doe / 146_096) / 365;
+    let y = yoe + era * 400;
+    let doy = doe - (365 * yoe + yoe / 4 - yoe / 100);
+    let mp = (5 * doy + 2) / 153;
+    let d = doy - (153 * mp + 2) / 5 + 1;
+    let m = if mp < 10 { mp + 3 } else { mp - 9 };
+    (if m <= 2 { y + 1 } else { y }, m as u32, d as u32)
+}
+
+/// 加一个离线账户。
+///
+/// # Errors
+///
+/// 名字不合法、同名冲突、落盘失败时返回用户可读文案。
+pub fn add_offline(env: &HostEnv, name: &str) -> Result<String, String> {
+    let name = name.trim();
+    let meta = offline_meta(name, now_ms()).map_err(|error| error.to_string())?;
+    let display = meta.display_name().to_string();
+    let mut store = AccountStore::open(env.layout.auth_data());
+    store
+        .insert(meta, Credentials::Offline)
+        .map_err(|error| format!("添加账户失败：{error}"))?;
+    store
+        .save()
+        .map_err(|error| format!("保存账户失败：{error}"))?;
+    Ok(display)
+}
+
+/// 删除账户（按 id 或名字）。
+///
+/// # Errors
+///
+/// 找不到、落盘失败时返回用户可读文案。
+pub fn remove(env: &HostEnv, key: &str) -> Result<String, String> {
+    let mut store = AccountStore::open(env.layout.auth_data());
+    let meta = store
+        .remove(key)
+        .map_err(|error| format!("删除账户失败：{error}"))?;
+    store
+        .save()
+        .map_err(|error| format!("保存账户失败：{error}"))?;
+    Ok(meta.display_name().to_string())
+}
+
+/// 设备码登录任务句柄（取消标志 + 账户名回执）。
+#[derive(Debug, Clone, Default)]
+pub struct LoginJob {
+    /// 用户点了取消（线程收尾时据此丢弃结果）
+    pub cancelled: Arc<AtomicBool>,
+}
+
+impl LoginJob {
+    /// 新建一个未取消的句柄。
+    pub fn new() -> Self {
+        Self {
+            cancelled: Arc::new(AtomicBool::new(false)),
+        }
+    }
+
+    /// 取消。
+    pub fn cancel(&self) {
+        self.cancelled.store(true, Ordering::SeqCst);
+    }
+
+    /// 是否已取消。
+    pub fn is_cancelled(&self) -> bool {
+        self.cancelled.load(Ordering::SeqCst)
+    }
+}
+
+/// 起一次设备码登录（后台线程；`present` 时刻发 Waiting 事件）。
+pub fn start_login(env: HostEnv, tx: JobSender, job: LoginJob) {
+    spawn("msa-login", move || {
+        let auth = match MicrosoftAuth::from_env() {
+            Ok(auth) => auth.with_journal(Some(unlucky_core::auth::AuthJournal::in_logs_dir(
+                env.layout.logs(),
+            ))),
+            Err(error) => {
+                let _ = tx.send(HostTask::Login(Box::new(DeviceLoginView::failed(
+                    error.to_string(),
+                ))));
+                return;
+            }
+        };
+        let tx_prompt = tx.clone();
+        let result = block_on(auth.device_code_login(|prompt| {
+            let _ = tx_prompt.send(HostTask::Login(Box::new(DeviceLoginView::waiting(
+                &prompt.user_code,
+                &prompt.verification_uri,
+                prompt.expires_in.as_secs(),
+                &format!("{}#{}", prompt.verification_uri, prompt.user_code),
+            ))));
+        }));
+        if job.is_cancelled() {
+            let _ = tx.send(HostTask::Login(Box::default()));
+            return;
+        }
+        match result {
+            Ok(session) => {
+                let meta = unlucky_core::auth::account::AccountMeta::new(
+                    unlucky_core::auth::account::AccountKind::Microsoft,
+                    session.profile_id.clone(),
+                    session.profile_name.clone(),
+                    now_ms(),
+                );
+                let name = meta.display_name().to_string();
+                let mut store = AccountStore::open(env.layout.auth_data());
+                let saved = store
+                    .insert(meta, Credentials::Microsoft(session))
+                    .and_then(|()| store.save());
+                match saved {
+                    Ok(()) => {
+                        let _ =
+                            tx.send(HostTask::Login(Box::new(DeviceLoginView::succeeded(&name))));
+                        let _ = tx.send(HostTask::Accounts(accounts(&env, None)));
+                    }
+                    Err(error) => {
+                        let _ = tx.send(HostTask::Login(Box::new(DeviceLoginView::failed(
+                            format!("账户入库失败：{error}"),
+                        ))));
+                    }
+                }
+            }
+            Err(error) => {
+                let _ = tx.send(HostTask::Login(Box::new(DeviceLoginView::failed(
+                    error.to_string(),
+                ))));
+            }
+        }
+    });
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn time_display_matches_known_timestamps() {
+        assert_eq!(display_ms(0), "");
+        // 1_769_000_000_000 ms = 2026-01-21T12:53:20Z（取整到分钟）
+        assert_eq!(display_ms(1_769_000_000_000), "2026-01-21 12:53");
+    }
+
+    #[test]
+    fn offline_add_list_remove_round_trips() {
+        let dir = std::env::temp_dir().join(format!("ull-host-accounts-{}", std::process::id()));
+        let _ = std::fs::remove_dir_all(&dir);
+        let env = HostEnv::at_root(&dir);
+        std::fs::create_dir_all(env.layout.auth_data()).expect("auth 目录");
+
+        let name = add_offline(&env, "Steve").expect("加账户");
+        assert_eq!(name, "Steve");
+        let list = accounts(&env, None);
+        assert_eq!(list.len(), 1);
+        assert_eq!(list[0].kind, AccountKind::Offline);
+        assert!(!list[0].active);
+
+        let active = accounts(&env, Some(list[0].id.as_str()));
+        assert!(active[0].active);
+
+        let removed = remove(&env, "Steve").expect("删账户");
+        assert_eq!(removed, "Steve");
+        assert!(accounts(&env, None).is_empty());
+        assert!(add_offline(&env, "  ").is_err());
+        std::fs::remove_dir_all(&dir).ok();
+    }
+
+    #[test]
+    fn login_job_cancel_flag_is_shared() {
+        let job = LoginJob::new();
+        let clone = job.clone();
+        assert!(!clone.is_cancelled());
+        job.cancel();
+        assert!(clone.is_cancelled());
+    }
+}

crates/app/src/host/dispatch.rs

@@ -0,0 +1,152 @@
+//! `CoreHost::dispatch` 的指令实现（从 `host/mod.rs` 拆出，守 400 行上限）。
+//!
+//! 父模块的私有字段对子模块可见，所以这里直接读写 `self.env` / `self.tx` 等。
+
+use crate::dto::{AppCommand, Backend, CoreEvent, CreateRequest, LoaderKind};
+use crate::toast::ToastKind;
+
+use super::accounts::{self, LoginJob};
+use super::{game, install, java, launch, logs, settings, versions, CoreHost};
+
+impl CoreHost {
+    /// 下发一条用户意图（`Backend::dispatch` 的实现体）。
+    pub(super) fn dispatch_command(&mut self, command: AppCommand) {
+        self.dispatch_inner(command);
+    }
+}
+impl CoreHost {
+    /// 指令分发（见 `dispatch_command`）。
+    fn dispatch_inner(&mut self, command: AppCommand) {
+        match command {
+            AppCommand::RefreshAll => self.refresh_all(),
+            AppCommand::LaunchInstance(id) => self.start_launch(&id),
+            AppCommand::StopInstance(id) => match self.running_pid(&id) {
+                Some(pid) => match launch::stop(pid) {
+                    Ok(()) => self.toast(ToastKind::Info, "已请求停止游戏进程"),
+                    Err(reason) => self.toast(ToastKind::Error, reason),
+                },
+                None => self.toast(ToastKind::Warn, "这个实例当前没有在跑"),
+            },
+            AppCommand::ListVersions(_) => versions::spawn_list(self.env.clone(), self.tx.clone()),
+            AppCommand::InstallVersion(version) => {
+                let cancel = std::sync::Arc::new(std::sync::atomic::AtomicBool::new(false));
+                self.install_cancel = Some(std::sync::Arc::clone(&cancel));
+                install::spawn_install(
+                    self.env.clone(),
+                    self.tx.clone(),
+                    CreateRequest {
+                        name: version.clone(),
+                        version,
+                        loader: LoaderKind::Vanilla,
+                        loader_version: String::new(),
+                    },
+                    cancel,
+                );
+            }
+            AppCommand::CreateInstance(request) => {
+                let cancel = std::sync::Arc::new(std::sync::atomic::AtomicBool::new(false));
+                self.install_cancel = Some(std::sync::Arc::clone(&cancel));
+                install::spawn_install(self.env.clone(), self.tx.clone(), request, cancel);
+            }
+            AppCommand::CancelInstall => {
+                // 取消只在阶段边界生效（core 的下载循环没有取消钩子）：这里先把面板收回，
+                // 后台线程会在下一阶段开始前看到标记并收尾。
+                if let Some(cancel) = &self.install_cancel {
+                    cancel.store(true, std::sync::atomic::Ordering::SeqCst);
+                }
+                self.install = None;
+                self.send(CoreEvent::InstallProgress(None));
+            }
+            AppCommand::SetIsolation { id, mode } => {
+                match game::set_isolation(&self.env, &id, &mode) {
+                    Ok(()) => {
+                        self.toast(ToastKind::Success, "隔离档位已更新");
+                        self.refresh_instances();
+                    }
+                    Err(reason) => self.toast(ToastKind::Error, reason),
+                }
+            }
+            AppCommand::RefreshLogSessions => {
+                self.send(CoreEvent::LogSessionsChanged(logs::sessions(&self.env)));
+            }
+            AppCommand::OpenLogSession(id) => self.open_session(&id),
+            AppCommand::ImportCrashLog(path) => match logs::analyze_crash_file(&path) {
+                Ok((label, report)) => {
+                    self.send(CoreEvent::DiagnosisReady(report));
+                    self.toast(ToastKind::Info, label);
+                }
+                Err(reason) => self.toast(ToastKind::Warn, reason),
+            },
+            AppCommand::AddOfflineAccount(name) => match accounts::add_offline(&self.env, &name) {
+                Ok(display) => {
+                    self.toast(ToastKind::Success, format!("已添加离线账户 {display}"));
+                    self.refresh_accounts();
+                }
+                Err(reason) => self.toast(ToastKind::Error, reason),
+            },
+            AppCommand::RemoveAccount(key) => match accounts::remove(&self.env, &key) {
+                Ok(display) => {
+                    if self.active_account.as_deref() == Some(key.as_str()) {
+                        self.active_account = None;
+                    }
+                    self.toast(ToastKind::Info, format!("已删除账户 {display}"));
+                    self.refresh_accounts();
+                }
+                Err(reason) => self.toast(ToastKind::Error, reason),
+            },
+            AppCommand::SwitchAccount(id) => {
+                self.active_account = Some(id);
+                self.refresh_accounts();
+                self.toast(ToastKind::Info, "已切换启动账户");
+            }
+            AppCommand::StartDeviceLogin => {
+                self.login = Some(LoginJob::new());
+                let job = self.login.clone().unwrap_or_default();
+                self.send(CoreEvent::DeviceLoginChanged(crate::dto::DeviceLoginView {
+                    phase: crate::dto::DeviceLoginPhase::Requesting,
+                    message: "正在向微软申请设备码…".to_string(),
+                    ..crate::dto::DeviceLoginView::new()
+                }));
+                accounts::start_login(self.env.clone(), self.tx.clone(), job);
+            }
+            AppCommand::CancelDeviceLogin => {
+                if let Some(job) = &self.login {
+                    job.cancel();
+                }
+                self.login = None;
+                self.send(CoreEvent::DeviceLoginChanged(
+                    crate::dto::DeviceLoginView::new(),
+                ));
+            }
+            AppCommand::InstallJava(vendor) => {
+                self.java_busy = true;
+                self.java_message = format!("正在安装 Java（{vendor}）…");
+                self.refresh_java();
+                java::spawn_install(
+                    self.env.clone(),
+                    self.tx.clone(),
+                    unlucky_core::game::java::JdkVendor::parse(&vendor),
+                );
+            }
+            AppCommand::SetSetting { key, value } => match settings::set(&self.env, &key, &value) {
+                Ok(()) => {
+                    self.send(CoreEvent::SettingsChanged(settings::groups(&self.env)));
+                    self.java_chain.clear();
+                    self.refresh_java();
+                }
+                Err(reason) => self.toast(ToastKind::Error, reason),
+            },
+            AppCommand::DismissNotice(id) => {
+                self.notices.retain(|notice| notice.id != id);
+                self.send(CoreEvent::NoticesChanged(self.notices.clone()));
+            }
+            // AI 对话：agent 的 GUI host 未落地前用脚本回复（不接真实模型）
+            other @ (AppCommand::AskAgent(_) | AppCommand::StopAgent | AppCommand::SetYolo(_)) => {
+                self.chat.dispatch(other);
+                for event in self.chat.drain_events() {
+                    self.events.push_back(event);
+                }
+            }
+        }
+    }
+}

crates/app/src/host/engine.rs

@@ -0,0 +1,126 @@
+//! 下载引擎与 Java 落点的装配（versions / install / java 三个任务共用）。
+//!
+//! 与 CLI `install::build_engine` 同源：内容寻址缓存落 `.ULL/cache/`，地区判定走
+//! 24h 缓存 + 环境信号（**不做网络探测**，与 D7 的「不探测时」约定一致）。
+
+use std::path::PathBuf;
+use std::sync::Arc;
+
+use unlucky_core::download::cache::now_ms;
+use unlucky_core::download::region::{decide_from, load_cached, store_cached};
+use unlucky_core::download::region_system::detect_signals;
+use unlucky_core::download::{
+    ContentCache, DownloadEngine, EngineConfig, HealthRegistry, MirrorTable,
+};
+use unlucky_core::game::java::vendor::JdkVendor;
+use unlucky_core::game::java::{self, JavaInstallRoot};
+use unlucky_core::platform::paths::ProcessEnv;
+
+use super::env::HostEnv;
+
+/// 建下载引擎（缓存/健康度/地区判定都在数据根里）。
+pub fn engine(env: &HostEnv) -> DownloadEngine {
+    let cache_root = env.layout.cache();
+    let now = now_ms();
+    let region_path = cache_root.join("region.json");
+    let region = load_cached(&region_path, now).unwrap_or_else(|| {
+        let profile = decide_from(&detect_signals(), now);
+        let _ = store_cached(&region_path, &profile);
+        profile
+    });
+    DownloadEngine::new(
+        EngineConfig::default(),
+        Arc::new(MirrorTable::builtin()),
+        Arc::new(region),
+        Arc::new(HealthRegistry::open_in(&cache_root, now)),
+        Arc::new(ContentCache::open(&cache_root)),
+    )
+}
+
+/// 是否国内网络（决定默认发行版顺序与镜像优先级）。
+pub fn domestic(env: &HostEnv) -> bool {
+    engine(env).region().is_domestic()
+}
+
+/// 设置里的 `java.vendorPriority`（空 = 按地区默认序）。
+pub fn java_priority(env: &HostEnv) -> Vec<JdkVendor> {
+    env.store()
+        .effective("java.vendorPriority")
+        .and_then(serde_json::Value::as_array)
+        .map(|items| {
+            let texts: Vec<String> = items
+                .iter()
+                .filter_map(serde_json::Value::as_str)
+                .map(str::to_string)
+                .collect();
+            unlucky_core::game::java::vendor::parse_priority(&texts)
+        })
+        .unwrap_or_default()
+}
+
+/// 设置里的 `java.installRoot`（空 = 按数据目录模式派生）。
+pub fn java_install_override(env: &HostEnv) -> Option<PathBuf> {
+    env.store()
+        .doc()
+        .effective_str("java.installRoot")
+        .map(str::trim)
+        .filter(|text| !text.is_empty())
+        .map(PathBuf::from)
+}
+
+/// 托管 JDK 落点（解析失败 → 用户可读文案）。
+pub fn java_install_root(env: &HostEnv) -> Result<JavaInstallRoot, String> {
+    let override_root = java_install_override(env);
+    JavaInstallRoot::resolve(
+        env.mode(),
+        &env.layout,
+        override_root.as_deref(),
+        env.platform,
+        &ProcessEnv,
+    )
+    .map_err(|error| error.to_string())
+}
+
+/// 托管 JDK 可能存在的全部安装根（扫描运行时用）。
+pub fn java_scan_roots(env: &HostEnv) -> Vec<PathBuf> {
+    java::location::scan_roots(
+        env.mode(),
+        &env.layout,
+        java_install_override(env).as_deref(),
+        env.platform,
+        &ProcessEnv,
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn engine_uses_the_data_root_cache() {
+        let dir = std::env::temp_dir().join(format!("ull-host-engine-{}", std::process::id()));
+        let _ = std::fs::remove_dir_all(&dir);
+        let env = HostEnv::at_root(&dir);
+        std::fs::create_dir_all(env.layout.cache()).expect("cache");
+        let engine = engine(&env);
+        assert_eq!(engine.config().max_concurrency, 64);
+        // 地区判定不联网：只读缓存/信号
+        let _ = domestic(&env);
+        std::fs::remove_dir_all(&dir).ok();
+    }
+
+    #[test]
+    fn java_merge_priority_reads_settings() {
+        let dir = std::env::temp_dir().join(format!("ull-host-engine-p-{}", std::process::id()));
+        let _ = std::fs::remove_dir_all(&dir);
+        let env = HostEnv::at_root(&dir);
+        std::fs::create_dir_all(env.layout.config()).expect("config");
+        std::fs::write(
+            env.launcher_config(),
+            r#"{"java":{"vendorPriority":["zulu"]}}"#,
+        )
+        .expect("写配置");
+        assert_eq!(java_priority(&env), vec![JdkVendor::Zulu]);
+        std::fs::remove_dir_all(&dir).ok();
+    }
+}

crates/app/src/host/env.rs

@@ -0,0 +1,170 @@
+//! host 的环境快照：一份 `ResolvedData` + 由其派生的布局视图。
+//!
+//! app 自己不解析三模式数据根（那是 `core::platform::data_dir` 的活）；这里只做两件事：
+//! ①按「exe 同级便携 `launcher.json` 的 `core.*` 四键」拼请求；②把解析结果与
+//! `Platform` / `DataMode` 打成一个可克隆的结构，交给后台线程。
+//!
+//! 截图/演示通道用 [`HostEnv::at_root`] 直接钉一个根（`<root>/.ULL` + `<root>/.minecraft`）。
+
+use std::path::{Path, PathBuf};
+
+use unlucky_core::game::GameLayout;
+use unlucky_core::platform::data_dir::{DataDirRequest, DataMode, ResolvedData, Resolver};
+use unlucky_core::platform::layout::LauncherLayout;
+use unlucky_core::platform::paths::Platform;
+use unlucky_core::setting::keys::launcher_schema;
+use unlucky_core::setting::store::SettingStore;
+
+/// 数据根决定键（与 CLI 的 `DATA_ROOT_KEYS` 同源同义）。
+pub(crate) const DATA_ROOT_KEYS: [&str; 4] = [
+    "core.data_mode",
+    "core.data_custom_root",
+    "core.launcher_home",
+    "core.game_home",
+];
+
+/// host 运行期需要的一切路径/平台信息（可克隆进线程）。
+#[derive(Debug, Clone)]
+pub struct HostEnv {
+    /// 数据根解析结果
+    pub data: ResolvedData,
+    /// `.ULL/` 布局
+    pub layout: LauncherLayout,
+    /// `.minecraft/` 布局
+    pub game: GameLayout,
+    /// 平台
+    pub platform: Platform,
+}
+
+impl HostEnv {
+    /// 按便携目录的 `core.*` 解析真实数据根；解析不出来返回 `None`（host 退回 mock）。
+    pub fn resolve() -> Option<Self> {
+        let exe_dir = std::env::current_exe()
+            .ok()
+            .and_then(|path| path.parent().map(Path::to_path_buf))?;
+        let request = request_from_portable(&exe_dir);
+        let resolver = Resolver::new(Platform::current(), Some(exe_dir));
+        let data = resolver.resolve_default(&request).ok()?.clone();
+        Some(Self::from_data(data))
+    }
+
+    /// 直接钉一个根：`<root>/.ULL` + `<root>/.minecraft`（截图/演示通道）。
+    ///
+    /// 根下已有 `config/launcher.json` 时**尊重其中的 `core.game_home` / `core.launcher_home`**：
+    /// 演示根常用它把游戏目录指到既有真数据上（避免复制几 GB 的 assets/libraries）。
+    pub fn at_root(root: impl AsRef<Path>) -> Self {
+        let root = root.as_ref();
+        let request = request_from_portable(root);
+        let absolute = |path: Option<PathBuf>| path.filter(|path| path.is_absolute());
+        Self::from_data(ResolvedData {
+            mode: DataMode::Portable,
+            launcher_home: absolute(request.launcher_home).unwrap_or_else(|| root.join(".ULL")),
+            game_home: absolute(request.game_home).unwrap_or_else(|| root.join(".minecraft")),
+            redirected_from: None,
+        })
+    }
+
+    /// 由解析结果建环境。
+    pub fn from_data(data: ResolvedData) -> Self {
+        Self {
+            layout: data.layout(),
+            game: GameLayout::new(data.game_home.clone()),
+            platform: Platform::current(),
+            data,
+        }
+    }
+
+    /// `config/launcher.json` 路径。
+    pub fn launcher_config(&self) -> PathBuf {
+        self.layout.launcher_config()
+    }
+
+    /// 设置存储（每次现读一份；写操作自己 save）。
+    pub fn store(&self) -> SettingStore {
+        SettingStore::load(self.launcher_config(), launcher_schema())
+    }
+
+    /// 启动会话根（`.ULL/data/agent/sessions`）。
+    pub fn sessions_root(&self) -> PathBuf {
+        self.layout.agent_sessions()
+    }
+
+    /// 数据目录模式。
+    pub fn mode(&self) -> DataMode {
+        self.data.mode
+    }
+
+    /// 人读一行（设置页「数据」分组展示）。
+    pub fn data_line(&self) -> String {
+        format!(
+            "{} · 启动器 {} · 游戏 {}",
+            self.data.mode,
+            self.data.launcher_home.display(),
+            self.data.game_home.display()
+        )
+    }
+}
+
+/// 便携目录那份 `launcher.json` → 数据根请求（只读 `core.*` 四键）。
+pub(crate) fn request_from_portable(exe_dir: &Path) -> DataDirRequest {
+    let mut request = DataDirRequest::default();
+    let path = portable_config_path(exe_dir);
+    if !path.is_file() {
+        return request;
+    }
+    let store = SettingStore::load(&path, launcher_schema());
+    let text = |key: &str| store.doc().effective_str(key).map(str::to_string);
+    if let Some(mode) = text(DATA_ROOT_KEYS[0]).as_deref().and_then(DataMode::parse) {
+        request.mode = mode;
+    }
+    if let Some(root) = text(DATA_ROOT_KEYS[1]) {
+        request.custom_root = Some(PathBuf::from(root));
+    }
+    if let Some(home) = text(DATA_ROOT_KEYS[2]) {
+        request.launcher_home = Some(PathBuf::from(home));
+    }
+    if let Some(home) = text(DATA_ROOT_KEYS[3]) {
+        request.game_home = Some(PathBuf::from(home));
+    }
+    request
+}
+
+/// `<exe 目录>/.ULL/config/launcher.json`。
+pub(crate) fn portable_config_path(exe_dir: &Path) -> PathBuf {
+    LauncherLayout::new(exe_dir.join(".ULL")).launcher_config()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn at_root_splits_launcher_and_game_homes() {
+        let env = HostEnv::at_root("D:/tmp/ull-demo");
+        assert_eq!(env.layout.home(), Path::new("D:/tmp/ull-demo/.ULL"));
+        assert_eq!(env.game.root(), Path::new("D:/tmp/ull-demo/.minecraft"));
+        assert_eq!(env.mode(), DataMode::Portable);
+        assert!(env.data_line().contains("portable"));
+    }
+
+    #[test]
+    fn portable_request_reads_core_keys_only_when_file_exists() {
+        let dir = std::env::temp_dir().join(format!("ull-host-env-{}", std::process::id()));
+        std::fs::create_dir_all(dir.join(".ULL/config")).expect("建目录");
+        let request = request_from_portable(&dir);
+        assert_eq!(request, DataDirRequest::default());
+
+        std::fs::write(
+            portable_config_path(&dir),
+            r#"{"core":{"data_mode":"custom","data_custom_root":"D:/data/ull"}}"#,
+        )
+        .expect("写配置");
+        let request = request_from_portable(&dir);
+        assert_eq!(request.mode, DataMode::Custom);
+        assert_eq!(
+            request.custom_root.as_deref(),
+            Some(Path::new("D:/data/ull"))
+        );
+        std::fs::remove_dir_all(&dir).ok();
+    }
+}

crates/app/src/host/game.rs

@@ -0,0 +1,260 @@
+//! 实例快照：`profiles.json` + 版本 JSON + 会话索引 + 实例设置 → [`InstanceSummary`]。
+//!
+//! 「磁贴上的每个字」都在这里翻译完：版本号取自继承链根、加载器取自版本 id 前缀、
+//! 最后游玩时间取自会话索引、隔离档位取自实例设置（缺省跟全局 `instances.mode`）。
+
+use std::collections::BTreeMap;
+use std::path::Path;
+
+use unlucky_core::game::install::instance::{
+    read_instance_config, read_profiles, write_instance_config,
+};
+use unlucky_core::game::isolation::IsolationMode;
+use unlucky_core::game::{ProfileList, VersionJson};
+use unlucky_core::launch::session_index;
+
+use crate::dto::{
+    InstanceRuntime, InstanceSummary, LoaderInfo, LoaderKind, NoticeLevel, NoticeView,
+};
+
+use super::env::HostEnv;
+
+/// 全局默认隔离档位（`instances.mode`；缺键/坏值按 D20 默认 `isolated`）。
+pub fn global_mode(env: &HostEnv) -> IsolationMode {
+    env.store()
+        .doc()
+        .effective_str("instances.mode")
+        .and_then(IsolationMode::parse)
+        .unwrap_or_default()
+}
+
+/// 读实例清单（文件缺失 = 空列表，不是错误）。
+pub fn profiles(env: &HostEnv) -> ProfileList {
+    read_profiles(&env.layout).unwrap_or_default()
+}
+
+/// 全会话索引里「每个实例最近一次启动」的时间串。
+pub fn last_played(env: &HostEnv) -> BTreeMap<String, String> {
+    let index = session_index::index_path(&env.sessions_root());
+    let entries = session_index::read_all(&index).unwrap_or_default();
+    let mut map: BTreeMap<String, String> = BTreeMap::new();
+    for entry in entries {
+        if entry.instance_id.is_empty() || entry.started_at.is_empty() {
+            continue;
+        }
+        let current = map.get(&entry.instance_id);
+        if current.is_none_or(|existing| existing.as_str() < entry.started_at.as_str()) {
+            map.insert(entry.instance_id.clone(), entry.started_at);
+        }
+    }
+    map
+}
+
+/// 版本 JSON 的继承链根 id + 加载器（读不到返回 `(version_id, 原版)`）。
+pub fn describe_version(env: &HostEnv, version_id: &str) -> (String, LoaderInfo) {
+    let loader = loader_from_id(version_id);
+    let mut current = version_id.to_string();
+    let mut seen = 0;
+    while seen < 16 {
+        seen += 1;
+        let path = env.game.version_json(&current);
+        let Ok(text) = std::fs::read_to_string(&path) else {
+            break;
+        };
+        let Ok(json) = VersionJson::from_json_str(&text) else {
+            break;
+        };
+        match json.inherits_from {
+            Some(parent) if !parent.is_empty() => current = parent,
+            _ => break,
+        }
+    }
+    (current, loader)
+}
+
+/// 版本 id → 加载器（HMCL 同款命名口径：`1.20.1-forge-47.2.0` / `fabric-loader-0.16.5-1.20.1`）。
+pub fn loader_from_id(version_id: &str) -> LoaderInfo {
+    let lower = version_id.to_ascii_lowercase();
+    let grab = |marker: &str| -> String {
+        lower
+            .split_once(marker)
+            .map(|(_, rest)| rest.trim_start_matches('-').to_string())
+            .unwrap_or_default()
+    };
+    let (kind, version) = if lower.contains("neoforge") {
+        (LoaderKind::NeoForge, grab("neoforge-"))
+    } else if lower.contains("fabric-loader") {
+        (LoaderKind::Fabric, grab("fabric-loader-"))
+    } else if lower.contains("quilt-loader") {
+        (LoaderKind::Quilt, grab("quilt-loader-"))
+    } else if lower.contains("forge") {
+        (LoaderKind::Forge, grab("forge-"))
+    } else if lower.contains("optifine") {
+        (LoaderKind::OptiFine, grab("optifine"))
+    } else if lower.contains("liteloader") {
+        (LoaderKind::LiteLoader, grab("liteloader-"))
+    } else {
+        (LoaderKind::Vanilla, String::new())
+    };
+    LoaderInfo { kind, version }
+}
+
+/// 实例的隔离档位（实例文件优先，缺省显示全局档位）。
+pub fn isolation_of(env: &HostEnv, id: &str) -> String {
+    let global = global_mode(env);
+    match read_instance_config(&env.layout, id) {
+        Ok(Some(config)) => config.effective_isolation(global).as_str().to_string(),
+        _ => global.as_str().to_string(),
+    }
+}
+
+/// 实例快照。
+pub fn instances(env: &HostEnv) -> Vec<InstanceSummary> {
+    let profiles = profiles(env);
+    let played = last_played(env);
+    profiles
+        .profiles
+        .iter()
+        .map(|profile| {
+            let version_id = profile.version_id.clone();
+            let (mc_version, loader) = describe_version(env, &version_id);
+            InstanceSummary {
+                id: profile.id.as_str().to_string(),
+                name: profile.name.clone(),
+                mc_version,
+                loader,
+                last_played: played.get(profile.id.as_str()).cloned(),
+                runtime: InstanceRuntime::Idle,
+                icon: None,
+                isolation: isolation_of(env, profile.id.as_str()),
+                version_present: env.game.is_version_installed(&version_id),
+                version_id,
+            }
+        })
+        .collect()
+}
+
+/// 改实例隔离档位（写实例设置文件；不动任何数据）。
+///
+/// # Errors
+///
+/// 实例不存在、文件读不了/写不了时返回用户可读文案。
+pub fn set_isolation(env: &HostEnv, id: &str, mode: &str) -> Result<(), String> {
+    let parsed = IsolationMode::parse(mode)
+        .ok_or_else(|| format!("未知隔离档位 `{mode}`（isolated / shared）"))?;
+    let profiles = profiles(env);
+    let profile = profiles
+        .profiles
+        .iter()
+        .find(|profile| profile.id.as_str() == id)
+        .ok_or_else(|| format!("找不到实例 `{id}`"))?;
+    let mut config = read_instance_config(&env.layout, id)
+        .map_err(|error| format!("读实例设置失败：{error}"))?
+        .unwrap_or_else(|| {
+            unlucky_core::game::install::instance::InstanceConfig::new(
+                profile.id.as_str(),
+                &profile.version_id,
+            )
+        });
+    config.isolation = Some(match parsed {
+        IsolationMode::Isolated => unlucky_core::game::install::instance::Isolation::Isolated,
+        IsolationMode::Shared => unlucky_core::game::install::instance::Isolation::Shared,
+    });
+    write_instance_config(&env.layout, &config)
+        .map(|_| ())
+        .map_err(|error| format!("写实例设置失败：{error}"))
+}
+
+/// 启动前的切换检测：把 M30 的 `ModeChangeWarning` 翻成横幅通知。
+///
+/// 只在真启动时调用（会写 `lastModeChange.warned`，保证同一次切换只提示一次）。
+pub fn mode_change_notice(env: &HostEnv, id: &str) -> Option<NoticeView> {
+    let mut config = read_instance_config(&env.layout, id).ok()??;
+    let warning = config.take_mode_change_warning()?;
+    let _ = write_instance_config(&env.layout, &config);
+    Some(NoticeView::new(
+        &format!("isolation:{id}"),
+        NoticeLevel::Warn,
+        "隔离档位已切换",
+        &warning.message(),
+    ))
+}
+
+/// 建目录（数据根首次运行时）。
+pub fn ensure_root(env: &HostEnv) {
+    let _ = env.layout.ensure();
+    let _ = std::fs::create_dir_all(env.game.root());
+}
+
+/// 版本本体目录是否存在（启动前快速判断）。
+pub fn version_present(env: &HostEnv, version_id: &str) -> bool {
+    env.game.is_version_installed(version_id)
+}
+
+/// 路径显示成短串（通知/错误文案用）。
+pub fn short_path(path: &Path) -> String {
+    path.display().to_string()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn loader_parsing_covers_all_shapes() {
+        let cases = [
+            ("1.20.4", LoaderKind::Vanilla, ""),
+            (
+                "fabric-loader-0.16.5-1.20.1",
+                LoaderKind::Fabric,
+                "0.16.5-1.20.1",
+            ),
+            (
+                "quilt-loader-0.24.0-1.20.1",
+                LoaderKind::Quilt,
+                "0.24.0-1.20.1",
+            ),
+            ("1.20.1-forge-47.2.0", LoaderKind::Forge, "47.2.0"),
+            ("1.21.1-neoforge-21.1.80", LoaderKind::NeoForge, "21.1.80"),
+        ];
+        for (id, kind, version) in cases {
+            let info = loader_from_id(id);
+            assert_eq!(info.kind, kind, "{id}");
+            assert_eq!(info.version, version, "{id}");
+            assert!(!info.badge().is_empty());
+        }
+    }
+
+    #[test]
+    fn isolation_write_then_read_round_trips() {
+        let dir = std::env::temp_dir().join(format!("ull-host-game-{}", std::process::id()));
+        let _ = std::fs::remove_dir_all(&dir);
+        let env = HostEnv::at_root(&dir);
+        std::fs::create_dir_all(env.layout.config()).expect("config 目录");
+
+        // 直接建一份 profiles.json（register 需要版本本体，这里只测隔离写读）
+        let profiles = ProfileList {
+            profiles: vec![unlucky_core::game::InstanceProfile {
+                id: unlucky_core::game::ProfileId::generate(),
+                name: "demo".to_string(),
+                version_id: "1.20.1".to_string(),
+                game_dir: None,
+                running_dir: None,
+                java_path: None,
+                created_at: None,
+                last_played_at: None,
+                extra: BTreeMap::new(),
+            }],
+            ..ProfileList::default()
+        };
+        unlucky_core::game::install::instance::write_profiles(&env.layout, &profiles)
+            .expect("写清单");
+        let id = profiles.profiles[0].id.as_str().to_string();
+
+        assert_eq!(isolation_of(&env, &id), "isolated");
+        set_isolation(&env, &id, "shared").expect("切档位");
+        assert_eq!(isolation_of(&env, &id), "shared");
+        assert!(set_isolation(&env, &id, "nope").is_err());
+        std::fs::remove_dir_all(&dir).ok();
+    }
+}

crates/app/src/host/handle.rs

@@ -0,0 +1,145 @@
+//! `HostTask` → `CoreEvent` 的翻译（从 `host/mod.rs` 拆出，守 400 行硬限）。
+//!
+//! 父模块的私有字段对子模块可见，所以这里直接读写 `self.tx` / `self.launches` 等。
+
+use crate::dto::{AppEvent, CoreEvent, InstanceRuntime, LogOutcome};
+use crate::toast::ToastKind;
+
+use super::{logs, CoreHost, HostTask, LiveLaunch};
+
+impl CoreHost {
+    /// 后台消息 → 事件。
+    pub(super) fn handle(&mut self, task: HostTask) {
+        match task {
+            HostTask::Versions(Ok(versions)) => self.send(CoreEvent::VersionListChanged(versions)),
+            HostTask::Versions(Err(reason)) => {
+                self.toast(ToastKind::Warn, format!("拉取版本清单失败：{reason}"));
+            }
+            HostTask::Install(progress) => {
+                self.install = Some(*progress.clone());
+                self.send(CoreEvent::InstallProgress(Some(*progress)));
+            }
+            HostTask::InstallDone { progress, result } => {
+                self.install_cancel = None;
+                self.install = Some(*progress.clone());
+                self.send(CoreEvent::InstallProgress(Some(*progress)));
+                match result {
+                    Ok(_) => {
+                        self.refresh_instances();
+                        self.send(CoreEvent::LogSessionsChanged(logs::sessions(&self.env)));
+                    }
+                    Err(reason) => self.toast(ToastKind::Error, reason),
+                }
+            }
+            HostTask::Accounts(accounts) => {
+                self.accounts = accounts.clone();
+                self.send(CoreEvent::AccountsChanged(accounts));
+                self.refresh_instances();
+            }
+            HostTask::Login(view) => self.send(CoreEvent::DeviceLoginChanged(*view)),
+            HostTask::Java(page) => self.send(CoreEvent::JavaChanged(*page)),
+            HostTask::Logs {
+                sessions,
+                lines,
+                diagnosis,
+            } => {
+                self.send(CoreEvent::LogSessionsChanged(sessions));
+                self.send(CoreEvent::LogLinesChanged(lines));
+                if let Some(report) = diagnosis {
+                    self.send(CoreEvent::DiagnosisReady(report));
+                }
+            }
+            HostTask::Sessions(sessions) => self.send(CoreEvent::LogSessionsChanged(sessions)),
+            HostTask::Tail(batch) => {
+                if batch.running {
+                    self.send(CoreEvent::LogLinesChanged(batch.lines));
+                } else {
+                    self.send(CoreEvent::LogAppended(*batch));
+                }
+            }
+            HostTask::LaunchStarted {
+                id,
+                session_id,
+                pid,
+            } => {
+                self.pending.remove(&id);
+                self.failed.remove(&id);
+                self.launches.retain(|live| live.instance != id);
+                self.launches.push(LiveLaunch {
+                    instance: id.clone(),
+                    session: session_id.clone(),
+                    pid,
+                });
+                // 实时尾随一次只跟一场（下载页/日志页共用一个滚动窗口）；
+                // 已有别的实例在尾随时不抢占——它的日志仍在 JSONL 里，收尾后可回放。
+                if self.tail.session().is_none() {
+                    self.tail.attach(
+                        self.env
+                            .sessions_root()
+                            .join("game")
+                            .join(format!("{session_id}.jsonl")),
+                        &session_id,
+                    );
+                }
+                self.send(CoreEvent::InstanceRuntimeChanged {
+                    id,
+                    runtime: InstanceRuntime::Running { pid },
+                });
+            }
+            HostTask::Runtime { id, runtime } => {
+                self.send(CoreEvent::InstanceRuntimeChanged { id, runtime });
+            }
+            HostTask::LaunchEnd(finished) => {
+                // 收尾可能发生在 LaunchStarted 之前（build_request / spawn 失败只发
+                // LaunchEnd）：pending 必须在这里也清掉，否则 in_flight 恒真、该实例
+                // 本会话内再也起不来。
+                self.pending.remove(&finished.id);
+                self.launches.retain(|live| live.instance != finished.id);
+                let runtime = if finished.outcome == LogOutcome::Ok {
+                    self.failed.remove(&finished.id);
+                    InstanceRuntime::Idle
+                } else {
+                    // 记住失败原因：随后的 refresh_instances 会重建快照，
+                    // 不记的话磁贴的「失败/重试」外观会被 Idle 盖掉。
+                    self.failed
+                        .insert(finished.id.clone(), finished.summary.clone());
+                    InstanceRuntime::Failed {
+                        reason: finished.summary.clone(),
+                    }
+                };
+                self.send(CoreEvent::InstanceRuntimeChanged {
+                    id: finished.id.clone(),
+                    runtime,
+                });
+                self.send(CoreEvent::LaunchFinished((*finished).clone()));
+                // 只拆自己那场的尾随：并发时另一实例的实时日志不该被这次收尾掐掉。
+                if self.tail.session() == Some(finished.session.as_str()) {
+                    self.tail.detach();
+                }
+                self.send(CoreEvent::LogSessionsChanged(logs::sessions(&self.env)));
+                self.refresh_instances();
+            }
+            HostTask::Crash(report) => {
+                self.send(CoreEvent::DiagnosisReady(*report));
+            }
+            HostTask::Notice(notice) => self.push_notice(*notice),
+            HostTask::Toast(toast) => self.events.push_back(AppEvent::Toast(*toast)),
+        }
+    }
+
+    /// 尾随运行中会话（每 `TAIL_POLL_TICKS` 拍一次）。
+    pub(super) fn poll_tail(&mut self) {
+        let Some((session, lines)) = self.tail.poll() else {
+            return;
+        };
+        if lines.is_empty() {
+            return;
+        }
+        let running = self.launches.iter().any(|live| live.session == session);
+        self.send(CoreEvent::LogAppended(crate::dto::LiveLogBatch {
+            session,
+            lines,
+            running,
+        }));
+    }
+}

crates/app/src/host/identity.rs

@@ -0,0 +1,103 @@
+//! 启动身份：选中账户 → `AuthPlaceholders`（**凭据只在这里读，读完即丢**）+ 收尾结局映射。
+//!
+//! 与 CLI `commands/identity.rs` 同源：微软轨过期就静默续期并回写凭据（refresh_token 轮换，
+//! 旧值作废）；零账户回落离线占位，保证没有账户时照样能启动。
+
+use unlucky_core::auth::account::{AccountKind, Credentials};
+use unlucky_core::auth::microsoft::MicrosoftAuth;
+use unlucky_core::auth::offline::offline_login;
+use unlucky_core::auth::AccountStore;
+use unlucky_core::download::blocking::block_on;
+use unlucky_core::game::ProfileId;
+use unlucky_core::launch::request::AuthPlaceholders;
+
+use crate::dto::LogOutcome;
+
+use super::env::HostEnv;
+
+/// 把选中账户翻成启动占位符（**凭据只在这里读，读完即丢**）。
+///
+/// 微软轨：过期就静默续期并回写凭据（refresh_token 轮换，旧值作废）。
+///
+/// # Errors
+///
+/// 账户不存在/凭据类型不符/令牌过期且刷新失败时返回用户可读文案。
+pub fn resolve(env: &HostEnv, account: Option<&str>) -> Result<(AuthPlaceholders, String), String> {
+    let store = AccountStore::open(env.layout.auth_data());
+    let chosen = match account {
+        Some(key) => store
+            .find(key)
+            .cloned()
+            .ok_or_else(|| format!("找不到账户 `{key}`"))?,
+        None => match store.accounts() {
+            [] => {
+                let uuid = ProfileId::generate().as_str().replace('-', "");
+                return Ok((
+                    AuthPlaceholders {
+                        player_name: "Player".to_string(),
+                        uuid,
+                        user_type: "legacy".to_string(),
+                        user_properties: "{}".to_string(),
+                        ..AuthPlaceholders::default()
+                    },
+                    "未登录账户，按离线占位启动".to_string(),
+                ));
+            }
+            [only] => only.clone(),
+            many => return Err(format!("有 {} 个账户，请在账户页选一个再启动", many.len())),
+        },
+    };
+    let line = format!("账户 {}（{}）", chosen.display_name(), chosen.kind.label());
+    match chosen.kind {
+        AccountKind::Offline => {
+            let placeholders =
+                offline_login(&chosen).map_err(|error| format!("离线账户解析失败：{error}"))?;
+            Ok((placeholders, line))
+        }
+        AccountKind::Microsoft => {
+            let Some(Credentials::Microsoft(session)) = store.credentials(&chosen.id) else {
+                return Err(format!(
+                    "账户 {} 的微软凭据缺失或类型不符，请重新登录",
+                    chosen.display_name()
+                ));
+            };
+            let auth =
+                MicrosoftAuth::from_env().map_err(|error| format!("微软登录不可用：{error}"))?;
+            let (fresh, _) = block_on(auth.ensure_fresh(session))
+                .map_err(|error| format!("微软令牌刷新失败：{error}"))?;
+            if &fresh != session {
+                // refresh_token 已轮换：立刻回写，旧值作废。
+                let mut store = AccountStore::open(env.layout.auth_data());
+                let _ = store.update_credentials(&chosen.id, Credentials::Microsoft(fresh.clone()));
+                let _ = store.save();
+            }
+            let placeholders = fresh
+                .to_placeholders()
+                .map_err(|error| format!("微软身份转换失败：{error}"))?;
+            Ok((placeholders, line))
+        }
+        AccountKind::AuthlibInjector => {
+            let Some(Credentials::AuthlibInjector(session)) = store.credentials(&chosen.id) else {
+                return Err(format!(
+                    "账户 {} 的第三方凭据缺失或类型不符",
+                    chosen.display_name()
+                ));
+            };
+            let placeholders = session
+                .to_placeholders()
+                .map_err(|error| format!("第三方身份转换失败：{error}"))?;
+            Ok((placeholders, line))
+        }
+    }
+}
+
+/// `SessionHandle` → 日志页的三种结局。
+pub fn outcome_of(handle: &unlucky_core::launch::SessionHandle) -> LogOutcome {
+    if handle.exit.silent_failure.is_some() {
+        LogOutcome::SilentFail
+    } else if handle.succeeded() {
+        LogOutcome::Ok
+    } else {
+        LogOutcome::Crashed
+    }
+}

crates/app/src/host/install.rs

@@ -0,0 +1,313 @@
+//! 安装：新建实例向导 / 下载页「安装」→ core 安装管线（原版 + Fabric/Quilt）→ 登记实例。
+//!
+//! 与 CLI `ull install` 同序：`RemoteSource::resolve → InstallPlan::build → execute → register`。
+//! 差异：进度经 [`super::job::HostTask::Install`] 回流（文件计数 + 字节 + 速度/ETA），
+//! 且整段跑在后台线程里（`block_on` 不占 UI 线程）。
+//!
+//! 加载器范围：原版 + Fabric/Quilt（纯库层）。Forge/NeoForge 要外调 java 跑 installer
+//! processors（M35 的执行器在 CLI 侧），GUI 这一轮**显式拒装并说清去哪装**，
+//! 而不是装出一个启动必崩的骨架。
+
+use std::path::PathBuf;
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::Arc;
+
+use unlucky_core::addon::loader::{
+    LoaderInstallPlan, LoaderKind as CoreLoaderKind, LoaderPlanInput, LoaderSource,
+};
+use unlucky_core::download::blocking::block_on;
+use unlucky_core::download::cache::now_ms;
+use unlucky_core::download::DownloadEngine;
+use unlucky_core::game::arguments::Environment;
+use unlucky_core::game::install::{
+    execute, InstallError, InstallPlan, InstallReport, PlanInput, RemoteSource,
+};
+
+use crate::dto::{CreateRequest, InstallStage, LoaderKind};
+use crate::toast::{Toast, ToastKind};
+
+use super::env::HostEnv;
+use super::job::{spawn, HostTask, JobSender};
+use super::meter::{sink_for, Meter};
+
+/// 文件级并发上限（与 CLI 同值：16 路压满带宽又不至于打爆镜像）。
+pub const CONCURRENCY: usize = 16;
+
+/// 用户取消的稳定文案（阶段边界生效）。
+pub const CANCELLED: &str = "已取消（阶段边界停下；已下载的文件保留，重装会续用）";
+
+/// 加载器徽标（`原版` / `Fabric 0.16.5`）。
+pub fn loader_label(kind: LoaderKind, version: &str) -> String {
+    if kind == LoaderKind::Vanilla || version.trim().is_empty() {
+        kind.label().to_string()
+    } else {
+        format!("{} {}", kind.label(), version)
+    }
+}
+
+/// GUI 侧支持的加载器（Forge/NeoForge 需要 installer processors）。
+pub fn supported(kind: LoaderKind) -> bool {
+    matches!(
+        kind,
+        LoaderKind::Vanilla | LoaderKind::Fabric | LoaderKind::Quilt
+    )
+}
+
+/// 不支持的加载器 → 给用户的可执行建议。
+pub fn unsupported_reason(kind: LoaderKind) -> String {
+    format!(
+        "{} 需要 installer processors（外调 java 改 jar），GUI 这一轮还没接入；请先在终端跑 `ull install <版本> --loader {}`，装完回实例页刷新即可启动。",
+        kind.label(),
+        kind.as_str()
+    )
+}
+
+/// 后台安装（向导提交 / 下载页行内安装共用）。
+pub fn spawn_install(env: HostEnv, tx: JobSender, request: CreateRequest, cancel: Arc<AtomicBool>) {
+    spawn("install", move || {
+        let meter = Arc::new(std::sync::Mutex::new(Meter::new(&request)));
+        let result = run(&env, &tx, &request, &meter, &cancel);
+        let mut progress = meter
+            .lock()
+            .map(|guard| guard.progress.clone())
+            .unwrap_or_else(|_| Meter::new(&request).progress);
+        match result {
+            Ok(name) => {
+                progress.stage = InstallStage::Done;
+                progress.files_done = progress.files_total;
+                progress.message = format!("已安装 {name}（{}）", progress.loader);
+                let _ = tx.send(HostTask::InstallDone {
+                    progress: Box::new(progress),
+                    result: Ok(name),
+                });
+                let _ = tx.send(HostTask::Toast(Box::new(Toast {
+                    id: 0,
+                    kind: ToastKind::Success,
+                    text: "安装完成，实例已登记".to_string(),
+                    remaining_ms: 0,
+                })));
+            }
+            Err(reason) => {
+                progress.stage = if reason == CANCELLED {
+                    InstallStage::Cancelled
+                } else {
+                    InstallStage::Failed
+                };
+                progress.message.clone_from(&reason);
+                let _ = tx.send(HostTask::InstallDone {
+                    progress: Box::new(progress),
+                    result: Err(reason),
+                });
+            }
+        }
+    });
+}
+
+/// 真安装（同步跑完，调用方在后台线程里）。
+fn run(
+    env: &HostEnv,
+    tx: &JobSender,
+    request: &CreateRequest,
+    meter: &Arc<std::sync::Mutex<Meter>>,
+    cancel: &Arc<AtomicBool>,
+) -> Result<String, String> {
+    if request.version.trim().is_empty() {
+        return Err("没有选择版本".to_string());
+    }
+    if !supported(request.loader) {
+        return Err(unsupported_reason(request.loader));
+    }
+    let name = request.instance_name();
+    let engine = super::engine::engine(env);
+    {
+        let mut guard = meter.lock().map_err(|_| "进度锁失效".to_string())?;
+        guard.stage(InstallStage::Planning, "正在解析版本清单…");
+        let _ = tx.send(HostTask::Install(Box::new(guard.progress.clone())));
+    }
+
+    if cancel.load(Ordering::SeqCst) {
+        return Err(CANCELLED.to_string());
+    }
+    let version_id = if request.loader == LoaderKind::Vanilla {
+        install_vanilla(env, &engine, request, tx, meter, cancel)?
+    } else {
+        install_loader(env, &engine, request, tx, meter, cancel)?
+    };
+
+    {
+        let mut guard = meter.lock().map_err(|_| "进度锁失效".to_string())?;
+        guard.stage(InstallStage::Registering, "正在登记实例…");
+        let _ = tx.send(HostTask::Install(Box::new(guard.progress.clone())));
+    }
+    let created_at =
+        unlucky_core::launch::time::format_rfc3339_millis(unlucky_core::launch::time::now());
+    unlucky_core::game::install::instance::register(
+        &env.layout,
+        &name,
+        &version_id,
+        Some(&created_at),
+    )
+    .map_err(|error| format!("登记实例失败：{error}"))?;
+    Ok(name)
+}
+
+/// 原版安装（`resolve → plan → [prefetch 资源索引] → execute`）。
+fn install_vanilla(
+    env: &HostEnv,
+    engine: &DownloadEngine,
+    request: &CreateRequest,
+    tx: &JobSender,
+    meter: &Arc<std::sync::Mutex<Meter>>,
+    cancel: &Arc<AtomicBool>,
+) -> Result<String, String> {
+    let version = request.version.trim();
+    let meta_cache = env.layout.meta_cache();
+    let now = now_ms();
+    let sink = sink_for(tx.clone(), Arc::clone(meter));
+    block_on(async {
+        let source = RemoteSource::new(engine, &env.game, &meta_cache, now);
+        let resolved = source.resolve(version).await.map_err(install_error)?;
+        let fetched = match resolved
+            .asset_index
+            .as_ref()
+            .filter(|index| index.url.is_some())
+        {
+            Some(reference) => {
+                let (index, bytes) = source.asset_index(reference).await.map_err(install_error)?;
+                Some((index, env.game.asset_index(&reference.id), bytes))
+            }
+            None => None,
+        };
+        let mut plan = InstallPlan::build(PlanInput {
+            layout: &env.game,
+            version_id: version,
+            resolved: &resolved,
+            asset_index: fetched.as_ref().map(|(index, _, _)| index),
+            environment: &Environment::host(),
+        })
+        .map_err(|error| error.to_string())?;
+        if let Some((_, dest, bytes)) = fetched {
+            plan.prefetch(dest, bytes);
+        }
+        if !plan.is_installable() {
+            return Err(format!(
+                "版本 {version} 装不全：{}",
+                plan.warnings.join("；")
+            ));
+        }
+        let (bytes_total, _) = plan.total_bytes();
+        {
+            let mut guard = meter.lock().map_err(|_| "进度锁失效".to_string())?;
+            guard.progress.files_total = u64::try_from(plan.file_count()).unwrap_or(u64::MAX);
+            guard.progress.bytes_total = bytes_total;
+            guard.stage(
+                InstallStage::Downloading,
+                &format!("开始下载 {} 个文件…", plan.file_count()),
+            );
+        }
+        if cancel.load(Ordering::SeqCst) {
+            return Err(CANCELLED.to_string());
+        }
+        let report = execute(engine, &plan, CONCURRENCY, Some(sink))
+            .await
+            .map_err(install_error)?;
+        ensure_complete(&report)?;
+        Ok::<String, String>(version.to_string())
+    })
+}
+
+/// 加载器安装（原版前置 → 加载器库 → 版本 JSON 落盘）。
+fn install_loader(
+    env: &HostEnv,
+    engine: &DownloadEngine,
+    request: &CreateRequest,
+    tx: &JobSender,
+    meter: &Arc<std::sync::Mutex<Meter>>,
+    cancel: &Arc<AtomicBool>,
+) -> Result<String, String> {
+    let version = request.version.trim();
+    let kind = CoreLoaderKind::parse(request.loader.as_str())
+        .ok_or_else(|| format!("未知加载器 `{}`", request.loader.as_str()))?;
+    let meta_cache = env.layout.meta_cache();
+    let loader_version = request.loader_version.trim().to_string();
+    let explicit = (!loader_version.is_empty()).then_some(loader_version.as_str());
+    let release = block_on(async {
+        LoaderSource::new(engine, &meta_cache)
+            .resolve(kind, version, explicit)
+            .await
+    })
+    .map_err(|error| error.to_string())?;
+
+    let plan = LoaderInstallPlan::build(LoaderPlanInput {
+        layout: &env.game,
+        release: &release,
+        environment: &Environment::host(),
+        vanilla_installed: env.game.is_version_installed(version),
+    });
+    if plan.vanilla_install_needed {
+        let mut vanilla = request.clone();
+        vanilla.loader = LoaderKind::Vanilla;
+        install_vanilla(env, engine, &vanilla, tx, meter, cancel)?;
+    }
+    {
+        let mut guard = meter.lock().map_err(|_| "进度锁失效".to_string())?;
+        guard.progress.files_total += u64::try_from(plan.files().len()).unwrap_or(u64::MAX);
+        let (bytes, _) = plan.install.total_bytes();
+        guard.progress.bytes_total = guard.progress.bytes_total.max(bytes);
+        guard.stage(
+            InstallStage::Downloading,
+            &format!("开始下载加载器库（{} 个文件）…", plan.files().len()),
+        );
+    }
+    if cancel.load(Ordering::SeqCst) {
+        return Err(CANCELLED.to_string());
+    }
+    let sink = sink_for(tx.clone(), Arc::clone(meter));
+    let report = block_on(async {
+        execute(engine, &plan.install, CONCURRENCY, Some(sink))
+            .await
+            .map_err(install_error)
+    })?;
+    ensure_complete(&report)?;
+    Ok(release.version_id)
+}
+
+/// 安装错误 → 用户可读文案。
+fn install_error(error: InstallError) -> String {
+    match error.hint() {
+        Some(hint) => format!("{}（{hint}）", error.message()),
+        None => error.message().to_string(),
+    }
+}
+
+/// 有文件失败就报错（列前三条明细）。
+fn ensure_complete(report: &InstallReport) -> Result<(), String> {
+    if report.is_complete() {
+        return Ok(());
+    }
+    let details: Vec<String> = report
+        .failures(3)
+        .iter()
+        .filter_map(|outcome| {
+            outcome
+                .failure
+                .as_ref()
+                .map(|failure| format!("{}：{}", outcome.name, failure.message))
+        })
+        .collect();
+    Err(format!(
+        "{} 个文件没下成（共 {} 个）：{}",
+        report.failed(),
+        report.files.len(),
+        details.join("；")
+    ))
+}
+
+/// 安装目录的短显示（诊断/Toast 用）。
+pub fn game_root(env: &HostEnv) -> PathBuf {
+    env.game.root().to_path_buf()
+}
+
+#[cfg(test)]
+#[path = "install_tests.rs"]
+mod tests;

crates/app/src/host/install_tests.rs

@@ -0,0 +1,86 @@
+//! host/install.rs 的单测（拆文件守 400 行上限）。
+
+use std::path::PathBuf;
+use std::sync::atomic::AtomicBool;
+use std::sync::Arc;
+
+use unlucky_core::game::install::{FileOutcome, FileRole, FileStatus};
+
+use super::{run, supported, unsupported_reason};
+use crate::dto::{CreateRequest, LoaderKind};
+use crate::host::env::HostEnv;
+use crate::host::meter::Meter;
+
+#[test]
+fn loader_support_matrix_is_explicit() {
+    assert!(supported(LoaderKind::Vanilla));
+    assert!(supported(LoaderKind::Fabric));
+    assert!(supported(LoaderKind::Quilt));
+    assert!(!supported(LoaderKind::Forge));
+    assert!(!supported(LoaderKind::NeoForge));
+    assert!(unsupported_reason(LoaderKind::Forge).contains("ull install"));
+}
+
+#[test]
+fn meter_counts_files_and_skips_skipped_bytes() {
+    let request = CreateRequest {
+        version: "1.20.4".to_string(),
+        loader: LoaderKind::Fabric,
+        loader_version: "0.16.5".to_string(),
+        name: "生存".to_string(),
+    };
+    let mut meter = Meter::new(&request);
+    assert_eq!(meter.progress.loader, "Fabric 0.16.5");
+    assert_eq!(meter.progress.instance, "生存");
+    meter.progress.files_total = 2;
+
+    let mut outcome = FileOutcome {
+        role: FileRole::Library,
+        name: "a.jar".to_string(),
+        dest: PathBuf::from("a.jar"),
+        status: FileStatus::Downloaded,
+        bytes: 100,
+        source: Some("bmclapi".to_string()),
+        failure: None,
+    };
+    meter.note(&outcome);
+    assert_eq!(meter.progress.files_done, 1);
+    assert_eq!(meter.progress.bytes_done, 100);
+
+    outcome.status = FileStatus::Skipped;
+    outcome.bytes = 500;
+    meter.note(&outcome);
+    assert_eq!(meter.progress.files_done, 2);
+    assert_eq!(meter.progress.bytes_done, 100, "跳过的文件不计入已下载字节");
+    assert!((meter.progress.ratio() - 1.0).abs() < f32::EPSILON);
+}
+
+#[test]
+fn empty_version_is_rejected_before_network() {
+    let dir = std::env::temp_dir().join(format!("ull-host-install-{}", std::process::id()));
+    let _ = std::fs::remove_dir_all(&dir);
+    let env = HostEnv::at_root(&dir);
+    let (tx, _rx) = super::super::job::channel();
+    let request = CreateRequest {
+        version: String::new(),
+        loader: LoaderKind::Vanilla,
+        loader_version: String::new(),
+        name: String::new(),
+    };
+    let meter = Arc::new(std::sync::Mutex::new(Meter::new(&request)));
+    let cancel = Arc::new(AtomicBool::new(false));
+    let err = run(&env, &tx, &request, &meter, &cancel).unwrap_err();
+    assert!(err.contains("没有选择版本"), "{err}");
+
+    let forge = CreateRequest {
+        version: "1.20.1".to_string(),
+        loader: LoaderKind::Forge,
+        ..request
+    };
+    let meter = Arc::new(std::sync::Mutex::new(Meter::new(&forge)));
+    let cancel = Arc::new(AtomicBool::new(false));
+    assert!(run(&env, &tx, &forge, &meter, &cancel)
+        .unwrap_err()
+        .contains("installer processors"));
+    std::fs::remove_dir_all(&dir).ok();
+}

crates/app/src/host/java.rs

@@ -0,0 +1,304 @@
+//! Java 页：四家发行版 + 回退链可视化 + 本地运行时 + 托管 JDK 安装。
+//!
+//! 回退链的两态：
+//! - **计划链**（还没装）：按生效顺序铺一排「待尝试」，让用户先看清会按什么顺序找；
+//! - **真实链**（装过一次/装失败）：`core::game::java::ChainLog` 的每跳结局与原因。
+//!
+//! 安装走 `java::install`（core 自己跑回退链），host 只负责把 `ChainLog` 翻成 DTO。
+
+use unlucky_core::game::java::probe::JavaOrigin;
+use unlucky_core::game::java::source::ChainLog;
+use unlucky_core::game::java::{self, JdkVendor};
+
+use crate::dto::{JavaChainOutcome, JavaChainStep, JavaPageView, JavaRuntimeView, JavaVendorView};
+
+use super::env::HostEnv;
+use super::job::{spawn, HostTask, JobSender};
+
+/// 托管 JDK 的默认目标大版本（D13 基准 JDK17）。
+pub const DEFAULT_JDK_MAJOR: u32 = 17;
+
+/// 该装哪个大版本：取第一个实例版本的要求，没有实例就给 17。
+pub fn target_major(env: &HostEnv) -> u32 {
+    let profiles = super::game::profiles(env);
+    profiles
+        .profiles
+        .first()
+        .map(|profile| {
+            java::requirement_for_version(&env.game, &profile.version_id)
+                .minimum
+                .max(8)
+        })
+        .unwrap_or(DEFAULT_JDK_MAJOR)
+}
+
+/// 四家发行版的展示行（镜像与吞吐口径与 CLI `ull java vendors` 一致）。
+pub fn vendors(env: &HostEnv, installed_vendors: &[String]) -> Vec<JavaVendorView> {
+    let domestic = super::engine::domestic(env);
+    let order = java::vendor::order(&super::engine::java_priority(env), domestic);
+    let table = unlucky_core::download::MirrorTable::builtin();
+    order
+        .iter()
+        .enumerate()
+        .map(|(index, vendor)| {
+            let id = vendor.id();
+            JavaVendorView {
+                id: id.to_string(),
+                display: vendor.display().to_string(),
+                rank: u32::try_from(index + 1).unwrap_or(u32::MAX),
+                majors: vendor
+                    .hint_majors()
+                    .iter()
+                    .map(u32::to_string)
+                    .collect::<Vec<_>>()
+                    .join("/"),
+                sources: sources_of(&table, *vendor),
+                installed: installed_vendors.iter().any(|known| known == id),
+            }
+        })
+        .collect()
+}
+
+/// 一家的源清单（与 CLI 展示同形）。
+fn sources_of(table: &unlucky_core::download::MirrorTable, vendor: JdkVendor) -> Vec<String> {
+    match vendor {
+        JdkVendor::Temurin => table
+            .adoptium
+            .iter()
+            .filter(|mirror| mirror.enabled)
+            .map(|mirror| mirror.name.clone())
+            .chain(std::iter::once(
+                "GitHub 官方（国内套 gh-proxy）".to_string(),
+            ))
+            .collect(),
+        JdkVendor::Oracle => table
+            .oracle_mirrors()
+            .map(|mirror| format!("{} {}", mirror.name, mirror.base()))
+            .collect(),
+        JdkVendor::Microsoft => vec!["aka.ms → VS CDN（无国内镜像）".to_string()],
+        JdkVendor::Zulu => table
+            .zulu()
+            .map(|zulu| vec![format!("{}（{}）", zulu.api, zulu.measured_speed)])
+            .unwrap_or_default(),
+    }
+}
+
+/// 本地运行时（托管 / JAVA_HOME / PATH / 系统安装位置，同一路径只留优先级高者）。
+pub fn runtimes(env: &HostEnv) -> Vec<JavaRuntimeView> {
+    let roots = super::engine::java_scan_roots(env);
+    let candidates = java::discover::dedupe(java::candidates_in_roots(&roots));
+    candidates
+        .iter()
+        .map(|runtime| JavaRuntimeView {
+            binary: runtime.binary.display().to_string(),
+            version: runtime
+                .version
+                .clone()
+                .unwrap_or_else(|| "版本未知".to_string()),
+            major: runtime.major.unwrap_or(java::DEFAULT_MAJOR),
+            vendor: runtime.vendor.clone().unwrap_or_else(|| "—".to_string()),
+            origin: runtime.origin.category().to_string(),
+        })
+        .collect()
+}
+
+/// 托管目录（展示「装到哪」）。
+pub fn managed_roots(env: &HostEnv) -> Vec<String> {
+    super::engine::java_scan_roots(env)
+        .iter()
+        .map(|root| root.display().to_string())
+        .collect()
+}
+
+/// 计划链（按生效顺序铺「待尝试」）。
+pub fn planned_chain(env: &HostEnv) -> Vec<JavaChainStep> {
+    let domestic = super::engine::domestic(env);
+    let order = java::vendor::order(&super::engine::java_priority(env), domestic);
+    order
+        .iter()
+        .map(|vendor| JavaChainStep {
+            vendor: vendor.id().to_string(),
+            outcome: JavaChainOutcome::Pending,
+            detail: String::new(),
+        })
+        .collect()
+}
+
+/// 真实链（`ChainLog` → DTO）。
+pub fn chain_steps(log: &ChainLog) -> Vec<JavaChainStep> {
+    log.attempts()
+        .iter()
+        .map(|attempt| JavaChainStep {
+            vendor: attempt.vendor.id().to_string(),
+            outcome: if attempt.ok {
+                JavaChainOutcome::Hit
+            } else if attempt.detail.contains("不支持") {
+                JavaChainOutcome::Skip
+            } else {
+                JavaChainOutcome::Failed
+            },
+            detail: attempt.detail.clone(),
+        })
+        .collect()
+}
+
+/// 整页快照。
+pub fn page(env: &HostEnv, chain: Vec<JavaChainStep>, busy: bool, message: &str) -> JavaPageView {
+    let runtimes = runtimes(env);
+    let installed_vendors: Vec<String> = runtimes
+        .iter()
+        .filter(|runtime| runtime.origin == JavaOrigin::Managed.category())
+        .map(|runtime| runtime.vendor.clone())
+        .collect();
+    let vendor_rows = vendors(env, &installed_vendors);
+    let domestic = super::engine::domestic(env);
+    let priority_set = !super::engine::java_priority(env).is_empty();
+    let chain = if chain.is_empty() {
+        planned_chain(env)
+    } else {
+        chain
+    };
+    JavaPageView {
+        region: if domestic { "domestic" } else { "global" }.to_string(),
+        priority_source: if priority_set {
+            "java.vendorPriority"
+        } else {
+            "region_default"
+        }
+        .to_string(),
+        order_text: vendor_rows
+            .iter()
+            .map(|vendor| vendor.display.clone())
+            .collect::<Vec<_>>()
+            .join(" → "),
+        vendors: vendor_rows,
+        chain,
+        runtimes,
+        managed_roots: managed_roots(env),
+        busy,
+        message: message.to_string(),
+    }
+}
+
+/// 后台装一个托管 JDK（`vendor` 为空 = 按回退链自己选）。
+pub fn spawn_install(env: HostEnv, tx: JobSender, vendor: Option<JdkVendor>) {
+    spawn("java-install", move || {
+        let major = target_major(&env);
+        let mut busy = page(&env, Vec::new(), true, &format!("正在安装 Java {major}…"));
+        busy.busy = true;
+        let _ = tx.send(HostTask::Java(Box::new(busy)));
+
+        let engine = super::engine::engine(&env);
+        let root = match super::engine::java_install_root(&env) {
+            Ok(root) => root,
+            Err(reason) => {
+                let _ = tx.send(HostTask::Java(Box::new(page(
+                    &env,
+                    Vec::new(),
+                    false,
+                    &format!("解析 Java 安装位置失败：{reason}"),
+                ))));
+                return;
+            }
+        };
+        let request = match vendor {
+            Some(vendor) => java::InstallRequest::with_vendor(major, vendor)
+                .with_priority(super::engine::java_priority(&env)),
+            None => {
+                java::InstallRequest::new(major).with_priority(super::engine::java_priority(&env))
+            }
+        };
+        let result =
+            unlucky_core::download::blocking::block_on(java::install(&engine, &root, request));
+        match result {
+            Ok(installed) => {
+                let message = if installed.reused() {
+                    format!(
+                        "Java {}（{}）已就绪：{}",
+                        installed.major,
+                        installed.vendor.id(),
+                        installed.root.display()
+                    )
+                } else {
+                    format!(
+                        "已安装 Java {}（{}）→ {} · {} 个文件",
+                        installed.major,
+                        installed.vendor.display(),
+                        installed.root.display(),
+                        installed.files
+                    )
+                };
+                let chain = chain_steps(&installed.chain);
+                let _ = tx.send(HostTask::Java(Box::new(page(&env, chain, false, &message))));
+            }
+            Err(error) => {
+                let _ = tx.send(HostTask::Java(Box::new(page(
+                    &env,
+                    Vec::new(),
+                    false,
+                    &format!("Java 安装失败：{error}"),
+                ))));
+            }
+        }
+    });
+}
+
+/// 「安装一个 Java」的 UI 文案（下载页 Java 分组的按钮说明）。
+pub fn install_hint(env: &HostEnv) -> String {
+    let major = target_major(env);
+    format!("按回退链取一个 Java {major}（托管目录，装完自动被启动链选中）")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn planned_chain_covers_four_vendors() {
+        let dir = std::env::temp_dir().join(format!("ull-host-java-{}", std::process::id()));
+        let _ = std::fs::remove_dir_all(&dir);
+        let env = HostEnv::at_root(&dir);
+        std::fs::create_dir_all(env.layout.config()).expect("config");
+        let chain = planned_chain(&env);
+        assert_eq!(chain.len(), 4);
+        assert!(chain
+            .iter()
+            .all(|step| step.outcome == JavaChainOutcome::Pending));
+        assert_eq!(chain[0].vendor, "temurin", "国内/国外默认都是 Temurin 第一");
+        std::fs::remove_dir_all(&dir).ok();
+    }
+
+    #[test]
+    fn chain_log_maps_to_steps() {
+        let mut log = ChainLog::new();
+        log.skip(
+            JdkVendor::Microsoft,
+            "不支持 Java 8（microsoft 只发 11/17/21/25）",
+        );
+        log.hit(JdkVendor::Temurin, "命中 Adoptium 17");
+        let steps = chain_steps(&log);
+        assert_eq!(steps.len(), 2);
+        assert_eq!(steps[0].outcome, JavaChainOutcome::Skip);
+        assert_eq!(steps[1].outcome, JavaChainOutcome::Hit);
+    }
+
+    #[test]
+    fn page_reports_region_and_priority_source() {
+        let dir = std::env::temp_dir().join(format!("ull-host-java-page-{}", std::process::id()));
+        let _ = std::fs::remove_dir_all(&dir);
+        let env = HostEnv::at_root(&dir);
+        std::fs::create_dir_all(env.layout.config()).expect("config");
+        std::fs::write(
+            env.launcher_config(),
+            r#"{"java":{"vendorPriority":["zulu"]}}"#,
+        )
+        .expect("写配置");
+        let page = page(&env, Vec::new(), false, "");
+        assert_eq!(page.priority_source, "java.vendorPriority");
+        assert_eq!(page.vendors[0].id, "zulu");
+        assert_eq!(page.vendors[0].rank, 1);
+        assert!(page.order_text.contains("Azul Zulu"));
+        assert_eq!(page.vendors.len(), 4);
+        std::fs::remove_dir_all(&dir).ok();
+    }
+}

crates/app/src/host/job.rs

@@ -0,0 +1,136 @@
+//! 后台任务的回流消息：`HostTask` 是唯一「线程 → host」的载荷。
+//!
+//! 线程只做 core 调用（网络/磁盘），产出的都是 `crate::dto` 的 DTO；
+//! host 的 `tick` 把它们翻成 [`crate::dto::CoreEvent`]。
+//! 这样「跨线程传的是什么」在一处看全，也不会出现半成品领域类型漏回 UI。
+
+use std::sync::mpsc::{Receiver, Sender};
+
+use crate::dto::{
+    AccountView, DeviceLoginView, DiagnosisReport, InstallProgressView, InstanceId,
+    InstanceRuntime, JavaPageView, LaunchFinished, LiveLogBatch, LogLine, LogOutcome, LogSession,
+    NoticeView, SessionId, VersionSummary,
+};
+use crate::toast::Toast;
+
+/// 后台任务 → host 的消息。
+#[derive(Debug, Clone, PartialEq)]
+pub enum HostTask {
+    /// 版本清单（下载页）
+    Versions(Result<Vec<VersionSummary>, String>),
+    /// 安装进度（高频，host 只做聚合与转发）
+    Install(Box<InstallProgressView>),
+    /// 安装收尾（成功带实例名，失败带文案）
+    InstallDone {
+        /// 最终进度快照
+        progress: Box<InstallProgressView>,
+        /// 成功时为 `Ok(实例名)`
+        result: Result<String, String>,
+    },
+    /// 账户列表
+    Accounts(Vec<AccountView>),
+    /// 设备码登录状态
+    Login(Box<DeviceLoginView>),
+    /// Java 页（发行版/回退链/运行时）
+    Java(Box<JavaPageView>),
+    /// 日志页快照（会话列表 + 选中会话的行 + 诊断）
+    Logs {
+        /// 会话列表
+        sessions: Vec<LogSession>,
+        /// 选中会话的行
+        lines: Vec<LogLine>,
+        /// 诊断结论
+        diagnosis: Option<DiagnosisReport>,
+    },
+    /// 实时日志增量
+    Tail(Box<LiveLogBatch>),
+    /// 启动开始（pid + 会话 id）
+    LaunchStarted {
+        /// 实例 id
+        id: InstanceId,
+        /// 会话 id
+        session_id: SessionId,
+        /// 进程号
+        pid: u32,
+    },
+    /// 启动阶段推进（磁贴进度环）
+    Runtime {
+        /// 实例 id
+        id: InstanceId,
+        /// 阶段状态
+        runtime: InstanceRuntime,
+    },
+    /// 启动收尾
+    LaunchEnd(Box<LaunchFinished>),
+    /// 崩溃日志导入的分析结论
+    Crash(Box<DiagnosisReport>),
+    /// 横幅通知（隔离切换提示等）
+    Notice(Box<NoticeView>),
+    /// Toast
+    Toast(Box<Toast>),
+    /// 会话列表刷新（只换左栏）
+    Sessions(Vec<LogSession>),
+}
+
+/// 后台线程用的发送端（`Sender` 克隆即可）。
+pub type JobSender = Sender<HostTask>;
+
+/// host 侧的接收端。
+pub type JobReceiver = Receiver<HostTask>;
+
+/// 建一对通道。
+pub fn channel() -> (JobSender, JobReceiver) {
+    std::sync::mpsc::channel()
+}
+
+/// 起一个带名字的后台线程（名字只进 panic 信息，方便定位）。
+pub fn spawn(name: &str, job: impl FnOnce() + Send + 'static) -> std::thread::JoinHandle<()> {
+    std::thread::Builder::new()
+        .name(format!("ull-host-{name}"))
+        .spawn(job)
+        .unwrap_or_else(|error| panic!("起不来后台线程 {name}: {error}"))
+}
+
+/// 人读一行「启动结束」。
+pub fn launch_summary(outcome: LogOutcome, exit_code: Option<i32>) -> String {
+    match outcome {
+        LogOutcome::Ok => "正常退出".to_string(),
+        LogOutcome::Crashed => match exit_code {
+            Some(code) => format!("崩溃（exit {code}）"),
+            None => "崩溃".to_string(),
+        },
+        LogOutcome::SilentFail => "静默失败（exit 0 但游戏没起来）".to_string(),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn channel_carries_tasks_across_threads() {
+        let (tx, rx) = channel();
+        let handle = spawn("test", move || {
+            tx.send(HostTask::Toast(Box::new(Toast {
+                id: 1,
+                kind: crate::toast::ToastKind::Info,
+                text: "hi".to_string(),
+                remaining_ms: 0,
+            })))
+            .expect("发送");
+        });
+        handle.join().expect("线程结束");
+        let task = rx.recv().expect("收到");
+        assert!(matches!(task, HostTask::Toast(toast) if toast.text == "hi"));
+    }
+
+    #[test]
+    fn launch_summary_names_the_outcome() {
+        assert_eq!(launch_summary(LogOutcome::Ok, Some(0)), "正常退出");
+        assert_eq!(
+            launch_summary(LogOutcome::Crashed, Some(1)),
+            "崩溃（exit 1）"
+        );
+        assert!(launch_summary(LogOutcome::SilentFail, Some(0)).contains("静默"));
+    }
+}

crates/app/src/host/launch.rs

@@ -0,0 +1,353 @@
+//! 启动全链：实例 → `LaunchRequest` → 子进程 → JSONL 事件流（GUI 版）。
+//!
+//! 与 CLI `ull launch` 同源同序（`core` 的 `game::resolve` / `arguments.expand` /
+//! `launch::adapter::build_request` / `Launcher::spawn`），差异只有两处：
+//! - **不阻塞 UI**：装配与等待都在后台线程里，进度/日志经 [`super::job::HostTask`] 回流；
+//! - **身份来自 GUI 选中的账户**（`AccountStore` → `AuthPlaceholders`），凭据只在
+//!   本模块内被读一次，绝不进 DTO。
+//!
+//! 停止：`kill_tree(pid)`（core 的三段式进程树回收），`finish()` 会照常收尾写索引。
+
+use std::path::PathBuf;
+
+use unlucky_core::game::arguments::Environment;
+use unlucky_core::game::install::instance::read_instance_config;
+use unlucky_core::game::isolation::{derive_game_dir, observe_mode, IsolationMode};
+use unlucky_core::game::{self, VersionJson};
+use unlucky_core::launch::adapter::{
+    self, AdapterOptions, AdapterWarning, LibraryInput, SnapshotInput,
+};
+use unlucky_core::launch::request::{JavaSelection, LaunchRequest, MemoryOptions};
+use unlucky_core::launch::time::{format_rfc3339_millis, now};
+use unlucky_core::launch::tree_kill;
+use unlucky_core::launch::{Launcher, LauncherConfig};
+use unlucky_core::platform::paths::ProcessEnv;
+
+use crate::dto::{
+    InstanceId, InstanceRuntime, LaunchFinished, LaunchStage, LoaderKind, LogOutcome, Progress,
+};
+
+use super::env::HostEnv;
+use super::job::{launch_summary, HostTask, JobSender};
+
+/// 启动器名（与 CLI `meta::LAUNCHER_NAME` 同值）。
+pub const LAUNCHER_NAME: &str = "Unlucky Launcher";
+
+/// 一次启动需要的实例信息。
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct LaunchTarget {
+    /// 实例 id
+    pub id: InstanceId,
+    /// 实例名
+    pub name: String,
+    /// 绑定的版本 id
+    pub version_id: String,
+    /// 账户 id（`None` = 离线占位）
+    pub account: Option<String>,
+}
+
+/// 选中并用起来的 Java（`summary` 给 UI 一行提示）。
+pub struct JavaPick {
+    /// 交给 adapter 的选择
+    pub selection: JavaSelection,
+    /// 人读一行
+    pub summary: String,
+}
+
+/// 选一个能用的 Java：托管 > JAVA_HOME > PATH（`core::game::java` 的探测与优先级）。
+pub fn pick_java(env: &HostEnv, version_id: &str) -> JavaPick {
+    let store = env.store();
+    let install_root = store
+        .doc()
+        .effective_str("java.installRoot")
+        .map(str::trim)
+        .filter(|text| !text.is_empty())
+        .map(PathBuf::from);
+    let roots = unlucky_core::game::java::location::scan_roots(
+        env.mode(),
+        &env.layout,
+        install_root.as_deref(),
+        env.platform,
+        &ProcessEnv,
+    );
+    let candidates = unlucky_core::game::java::candidates_in_roots(&roots);
+    let required = unlucky_core::game::java::requirement_for_version(&env.game, version_id);
+    let picked = unlucky_core::game::java::pick(&candidates, &required).cloned();
+    match picked {
+        Some(runtime) => {
+            let major = runtime
+                .major
+                .unwrap_or(unlucky_core::game::java::DEFAULT_MAJOR);
+            let summary = format!(
+                "Java {}（{}{}）",
+                runtime.version.clone().unwrap_or_else(|| major.to_string()),
+                runtime.origin.category(),
+                runtime
+                    .vendor
+                    .as_ref()
+                    .map(|vendor| format!(" · {vendor}"))
+                    .unwrap_or_default()
+            );
+            JavaPick {
+                selection: JavaSelection::new(runtime.binary, major, runtime.bits),
+                summary,
+            }
+        }
+        None => {
+            let binary = PathBuf::from(unlucky_core::game::java::java_binary_name());
+            let major = required.minimum;
+            JavaPick {
+                selection: JavaSelection::new(binary, major, 64),
+                summary: format!("PATH 上的 Java（未探测到版本，按 Java {major} 启动）"),
+            }
+        }
+    }
+}
+
+/// 装配 [`LaunchRequest`]（与 CLI `snapshot::prepare` 同序）。
+///
+/// # Errors
+///
+/// 版本 JSON 缺失/非法、继承链断裂、隔离派生失败时返回用户可读文案。
+pub fn build_request(
+    env: &HostEnv,
+    target: &LaunchTarget,
+) -> Result<(LaunchRequest, Vec<String>), String> {
+    let version_id = target.version_id.clone();
+    let manifest_path = env.game.version_json(&version_id);
+    let text = std::fs::read_to_string(&manifest_path)
+        .map_err(|error| format!("读版本 JSON 失败 {}：{error}", manifest_path.display()))?;
+    let manifest =
+        VersionJson::from_json_str(&text).map_err(|error| format!("版本 JSON 非法：{error}"))?;
+    let source = |id: &str| -> Option<VersionJson> {
+        std::fs::read_to_string(env.game.version_json(id))
+            .ok()
+            .and_then(|text| VersionJson::from_json_str(&text).ok())
+    };
+    let resolved =
+        game::resolve(&source, &manifest).map_err(|error| format!("解析继承链失败：{error}"))?;
+
+    let environment = Environment::host();
+    let expanded = resolved
+        .arguments
+        .as_ref()
+        .map(|arguments| arguments.expand(&environment))
+        .unwrap_or_default();
+
+    let mut libraries: Vec<LibraryInput> = Vec::new();
+    for library in resolved.libraries.as_deref().unwrap_or_default() {
+        if !library.applies(&environment) || library.native_classifier(&environment).is_some() {
+            continue;
+        }
+        let Ok(coordinate) = library.coordinate() else {
+            continue;
+        };
+        let path = if library.is_local() {
+            env.game.version_library(&version_id, &coordinate)
+        } else {
+            env.game.library(&coordinate)
+        };
+        libraries.push(LibraryInput::new(path, library.name.clone()));
+    }
+    let natives = unlucky_core::launch::natives::collect(
+        &env.game,
+        &version_id,
+        resolved.libraries.as_deref().unwrap_or_default(),
+        &environment,
+    );
+
+    let game_dir = run_dir(env, target)?;
+    let jar_id = resolved.jar.clone().unwrap_or_else(|| version_id.clone());
+    let assets_root = env.game.assets_dir();
+    let assets_index = resolved
+        .assets
+        .clone()
+        .or_else(|| resolved.asset_index.as_ref().map(|index| index.id.clone()));
+    let snapshot = SnapshotInput {
+        version_id: &version_id,
+        version_name: Some(&target.name),
+        version_type: None,
+        game_version: None,
+        main_class: resolved.main_class.as_deref(),
+        jvm_arguments: &expanded.jvm,
+        game_arguments: &expanded.game,
+        legacy_arguments: resolved.minecraft_arguments.as_deref(),
+        libraries: &libraries,
+        natives: &natives,
+        primary_jar: env.game.version_jar(&jar_id),
+        game_dir,
+        assets_index: assets_index.as_deref(),
+        natives_dir: env.game.natives_dir(&version_id),
+        library_dir: env.game.libraries_dir(),
+        assets_root: assets_root.clone(),
+        game_assets: assets_root,
+    };
+
+    let java = pick_java(env, &version_id);
+    let (auth, identity_line) = super::identity::resolve(env, target.account.as_deref())?;
+    let memory = env
+        .store()
+        .effective("java.default_memory_mb")
+        .and_then(serde_json::Value::as_u64)
+        .and_then(|value| u32::try_from(value).ok());
+    let options = AdapterOptions {
+        java: java.selection,
+        memory: MemoryOptions {
+            min_mb: None,
+            max_mb: memory,
+        },
+        auth,
+        launcher_name: LAUNCHER_NAME.to_string(),
+        launcher_version: env!("CARGO_PKG_VERSION").to_string(),
+        language: "zh-CN".to_string(),
+        ..AdapterOptions::strict()
+    };
+    let output = adapter::build_request(&snapshot, options);
+    let mut warnings: Vec<String> = output.warnings.iter().map(describe_warning).collect();
+    warnings.push(java.summary);
+    warnings.push(identity_line);
+    let mut request = output.request;
+    request.instance.id = target.id.clone();
+    request.instance.name = target.name.clone();
+    Ok((request, warnings))
+}
+
+/// 派生运行目录（D20 覆盖链：实例 `isolation` > 全局 `instances.mode`）。
+fn run_dir(env: &HostEnv, target: &LaunchTarget) -> Result<PathBuf, String> {
+    let global = super::game::global_mode(env);
+    let config = read_instance_config(&env.layout, &target.id)
+        .map_err(|error| format!("读实例设置失败：{error}"))?;
+    let derivation = derive_game_dir(&env.game, &target.version_id, global, config.as_ref(), None)
+        .map_err(|error| format!("隔离目录派生失败：{error}"))?;
+    if let Some(mut config) = config {
+        let at = format_rfc3339_millis(now());
+        if observe_mode(&mut config, &env.game, &at, derivation.isolation).unwrap_or(false) {
+            let _ =
+                unlucky_core::game::install::instance::write_instance_config(&env.layout, &config);
+        }
+    }
+    Ok(derivation.game_dir)
+}
+
+/// 起一次启动（后台线程；进度/日志/收尾全部走 `HostTask`）。
+pub fn start(env: HostEnv, tx: JobSender, target: LaunchTarget) {
+    let id = target.id.clone();
+    let tx_progress = tx.clone();
+    super::job::spawn("launch", move || {
+        let _ = tx_progress.send(HostTask::Runtime {
+            id: id.clone(),
+            runtime: InstanceRuntime::Busy {
+                stage: LaunchStage::Launch,
+                progress: Progress { done: 0, total: 1 },
+            },
+        });
+        let (request, warnings) = match build_request(&env, &target) {
+            Ok(ok) => ok,
+            Err(reason) => {
+                let _ = tx.send(HostTask::LaunchEnd(Box::new(LaunchFinished {
+                    id,
+                    session: String::new(),
+                    outcome: LogOutcome::Crashed,
+                    summary: format!("启动失败：{reason}"),
+                })));
+                return;
+            }
+        };
+        for warning in &warnings {
+            let _ = tx.send(HostTask::Notice(Box::new(crate::dto::NoticeView::new(
+                &format!("launch-warn:{}", target.id),
+                crate::dto::NoticeLevel::Info,
+                "启动提示",
+                warning,
+            ))));
+        }
+        let config = LauncherConfig::new(env.sessions_root())
+            .with_launcher(LAUNCHER_NAME, env!("CARGO_PKG_VERSION"));
+        let session = match Launcher::new(config).spawn(&request) {
+            Ok(session) => session,
+            Err(error) => {
+                let _ = tx.send(HostTask::LaunchEnd(Box::new(LaunchFinished {
+                    id,
+                    session: String::new(),
+                    outcome: LogOutcome::Crashed,
+                    summary: format!("启动失败：{error}"),
+                })));
+                return;
+            }
+        };
+        let session_id = session.session_id().to_string();
+        let pid = session.pid();
+        let _ = tx.send(HostTask::LaunchStarted {
+            id: id.clone(),
+            session_id: session_id.clone(),
+            pid,
+        });
+        let _ = tx.send(HostTask::Runtime {
+            id: id.clone(),
+            runtime: InstanceRuntime::Running { pid },
+        });
+        match session.finish() {
+            Ok(handle) => {
+                let outcome = super::identity::outcome_of(&handle);
+                let _ = tx.send(HostTask::LaunchEnd(Box::new(LaunchFinished {
+                    id,
+                    session: session_id,
+                    outcome,
+                    summary: format!(
+                        "{}（{}，{:.1}s）",
+                        launch_summary(outcome, Some(handle.exit.code)),
+                        handle.exit.exit_type.as_str(),
+                        handle.uptime_ms as f64 / 1000.0
+                    ),
+                })));
+            }
+            Err(error) => {
+                let _ = tx.send(HostTask::LaunchEnd(Box::new(LaunchFinished {
+                    id,
+                    session: session_id,
+                    outcome: LogOutcome::SilentFail,
+                    summary: format!("启动收尾失败：{error}"),
+                })));
+            }
+        }
+    });
+}
+
+/// 停止一次启动（按 pid 回收进程树；`finish()` 会在后台线程里照常收尾）。
+pub fn stop(pid: u32) -> Result<(), String> {
+    tree_kill::kill_tree(pid, std::time::Duration::from_secs(3))
+        .map_err(|error| format!("停止进程 {pid} 失败：{error}"))
+}
+
+/// 适配层告警 → 人读一行。
+fn describe_warning(warning: &AdapterWarning) -> String {
+    match warning {
+        AdapterWarning::MissingLibrary { name, path } => {
+            format!("缺少库文件 {name}（{}）", path.display())
+        }
+        AdapterWarning::MissingGameArguments => "版本 JSON 没有游戏参数".to_string(),
+        AdapterWarning::MissingAssetsIndex => "版本 JSON 没有资源索引".to_string(),
+        AdapterWarning::MissingMainClass => "版本 JSON 没有 mainClass".to_string(),
+        AdapterWarning::MissingNativeJar { name, path } => {
+            format!("缺少 natives 构件 {name}（{}）", path.display())
+        }
+    }
+}
+
+/// 加载器 → 适配层的模组加载器标记（GUI 只用于显示，不改命令行）。
+pub fn loader_label(kind: LoaderKind) -> &'static str {
+    match kind {
+        LoaderKind::Vanilla => "原版",
+        LoaderKind::Fabric => "Fabric",
+        LoaderKind::Quilt => "Quilt",
+        LoaderKind::Forge => "Forge",
+        LoaderKind::NeoForge => "NeoForge",
+        LoaderKind::OptiFine => "OptiFine",
+        LoaderKind::LiteLoader => "LiteLoader",
+    }
+}
+
+/// 隔离档位的展示串（`isolated` / `shared`）。
+pub fn isolation_label(mode: IsolationMode) -> &'static str {
+    mode.as_str()
+}

crates/app/src/host/launch_state_tests.rs

@@ -0,0 +1,267 @@
+//! host 启动状态机单测（P2-1/P2-2 的回归网）。
+//!
+//! 覆盖三件事：
+//! 1. `running_pid` 按实例 id 取 pid（并发启动不会把 A 的停止键指到 B）；
+//! 2. 重复启动守卫（`launches` 已落盘 + `pending` 窗口两态都要挡）；
+//! 3. `refresh_instances` 重建快照后仍保留真实运行时（Running / Busy / Failed）。
+
+use unlucky_core::game::install::instance::write_profiles;
+use unlucky_core::game::{InstanceProfile, ProfileId, ProfileList};
+
+use super::*;
+use crate::dto::{LaunchFinished, LogOutcome};
+use crate::toast::ToastKind;
+
+/// 临时数据根守卫：测试结束（含断言 panic）时把目录删掉，不留空壳。
+struct TempRoot(std::path::PathBuf);
+
+impl Drop for TempRoot {
+    fn drop(&mut self) {
+        let _ = std::fs::remove_dir_all(&self.0);
+    }
+}
+
+/// 建一个只有一条实例档案的数据根，返回 `(host, instance_id, 守卫)`。
+fn host_with_instance(label: &str) -> (CoreHost, String, TempRoot) {
+    let dir = std::env::temp_dir().join(format!(
+        "ull-host-launch-{label}-{}-{}",
+        std::process::id(),
+        line!()
+    ));
+    let _ = std::fs::remove_dir_all(&dir);
+    let env = HostEnv::at_root(&dir);
+    std::fs::create_dir_all(env.layout.config()).expect("config 目录");
+
+    let profile = InstanceProfile {
+        id: ProfileId::generate(),
+        name: "demo".to_string(),
+        version_id: "1.20.1".to_string(),
+        game_dir: None,
+        running_dir: None,
+        java_path: None,
+        created_at: None,
+        last_played_at: None,
+        extra: std::collections::BTreeMap::new(),
+    };
+    let id = profile.id.as_str().to_string();
+    let profiles = ProfileList {
+        profiles: vec![profile],
+        ..ProfileList::default()
+    };
+    write_profiles(&env.layout, &profiles).expect("写 profiles");
+    (CoreHost::headless(env), id, TempRoot(dir))
+}
+
+fn live(instance: &str, session: &str, pid: u32) -> LiveLaunch {
+    LiveLaunch {
+        instance: instance.to_string(),
+        session: session.to_string(),
+        pid,
+    }
+}
+
+#[test]
+fn running_pid_is_per_instance_not_a_single_slot() {
+    let (mut host, id, _root) = host_with_instance("pid");
+    host.launches.push(live("a", "s-a", 111));
+    host.launches.push(live("b", "s-b", 222));
+
+    assert_eq!(host.running_pid("a"), Some(111));
+    assert_eq!(host.running_pid("b"), Some(222));
+    assert_eq!(
+        host.running_pid("c"),
+        None,
+        "没启动过的实例不该拿到别人的 pid"
+    );
+
+    // A 收尾后只影响 A：这正是 review r1 P2-1 的场景（旧实现共用一个槽位）。
+    host.launches.retain(|entry| entry.instance != "a");
+    assert_eq!(host.running_pid("a"), None);
+    assert_eq!(host.running_pid("b"), Some(222));
+
+    // 落盘实例默认是 Idle，兜底分支不误报。
+    assert_eq!(host.running_pid(&id), None);
+}
+
+#[test]
+fn duplicate_launch_is_rejected_before_spawning() {
+    let (mut host, id, _root) = host_with_instance("dup");
+    let _ = host.drain_events();
+    host.launches.push(live(&id, "s", 111));
+
+    host.start_launch(&id);
+
+    let events = host.drain_events();
+    assert!(
+        !events.iter().any(|event| matches!(
+            event,
+            AppEvent::Core(CoreEvent::InstanceRuntimeChanged { .. })
+        )),
+        "已在运行/启动中的实例不该再发 Busy（那会起第二个进程）"
+    );
+    assert!(
+        events
+            .iter()
+            .any(|event| matches!(event, AppEvent::Toast(toast) if toast.kind == ToastKind::Warn)),
+        "至少要给用户一条「已经在启动/运行中」的提示"
+    );
+    assert_eq!(host.launches.len(), 1, "启动表不该被重复启动污染");
+}
+
+#[test]
+fn pending_window_also_blocks_a_second_launch() {
+    let (mut host, id, _root) = host_with_instance("pending");
+    // 走 start_launch 用的同一个入口，模拟「已受理、后台线程还没回报 LaunchStarted」。
+    host.mark_pending(&id);
+    assert!(host.in_flight(&id));
+
+    let _ = host.drain_events();
+    host.start_launch(&id);
+    let events = host.drain_events();
+    assert!(
+        !events.iter().any(|event| matches!(
+            event,
+            AppEvent::Core(CoreEvent::InstanceRuntimeChanged { .. })
+        )),
+        "pending 窗口内重复点启动必须被挡住"
+    );
+    assert_eq!(host.pending.len(), 1);
+}
+
+#[test]
+fn launch_started_registers_and_launch_end_clears() {
+    let (mut host, id, _root) = host_with_instance("cycle");
+    host.mark_pending(&id);
+
+    host.handle(HostTask::LaunchStarted {
+        id: id.clone(),
+        session_id: "20261031T120000-abcd12".to_string(),
+        pid: 4_242,
+    });
+    assert!(!host.pending.contains(&id), "回报后 pending 要清掉");
+    assert_eq!(host.running_pid(&id), Some(4_242));
+
+    host.handle(HostTask::LaunchEnd(Box::new(LaunchFinished {
+        id: id.clone(),
+        session: "20261031T120000-abcd12".to_string(),
+        outcome: LogOutcome::Ok,
+        summary: "正常退出".to_string(),
+    })));
+    assert!(host.launches.is_empty(), "收尾后启动表要清空");
+    assert!(!host.failed.contains_key(&id));
+    assert_eq!(host.running_pid(&id), None);
+}
+
+#[test]
+fn refresh_keeps_running_instances_running() {
+    let (mut host, id, _root) = host_with_instance("refresh-run");
+    host.launches.push(live(&id, "s", 4_242));
+    let _ = host.drain_events();
+
+    host.refresh_instances();
+
+    let instance = instances_from_events(host.drain_events())
+        .into_iter()
+        .find(|instance| instance.id == id)
+        .expect("刷新后应有该实例");
+    assert_eq!(
+        instance.runtime,
+        InstanceRuntime::Running { pid: 4_242 },
+        "刷新（装版本/账户变更/别的实例收尾）不能把在跑实例打回 Idle"
+    );
+}
+
+#[test]
+fn refresh_keeps_pending_as_busy_and_failed_as_failed() {
+    let (mut host, id, _root) = host_with_instance("refresh-busy");
+
+    // Busy：走 start_launch 用的同一个入口（mark_pending），而不是直接改字段。
+    host.mark_pending(&id);
+    let pending = instances_from_events({
+        host.refresh_instances();
+        host.drain_events()
+    })
+    .into_iter()
+    .find(|instance| instance.id == id)
+    .expect("实例存在");
+    assert!(matches!(
+        pending.runtime,
+        InstanceRuntime::Busy {
+            stage: crate::dto::LaunchStage::Launch,
+            ..
+        }
+    ));
+
+    // Failed：走唯一真实写入路径 LaunchEnd（不是手动塞 failed 表）。
+    host.handle(HostTask::LaunchEnd(Box::new(LaunchFinished {
+        id: id.clone(),
+        session: "20261031T120000-dead01".to_string(),
+        outcome: LogOutcome::Crashed,
+        summary: "崩溃（exit 1）".to_string(),
+    })));
+    assert!(!host.pending.contains(&id), "LaunchEnd 必须清 pending");
+    assert!(!host.in_flight(&id), "收尾后该实例要能被重新启动");
+
+    let failed = instances_from_events({
+        host.refresh_instances();
+        host.drain_events()
+    })
+    .into_iter()
+    .find(|instance| instance.id == id)
+    .expect("实例存在");
+    assert_eq!(
+        failed.runtime,
+        InstanceRuntime::Failed {
+            reason: "崩溃（exit 1）".to_string()
+        },
+        "失败原因要经得住一次刷新（否则磁贴的「重试」外观会被 Idle 盖掉）"
+    );
+}
+
+#[test]
+fn launch_end_before_launch_started_still_releases_the_instance() {
+    let (mut host, id, _root) = host_with_instance("fail-early");
+    // build_request / spawn 失败的现场：start_launch 已标 pending、后台线程只发 LaunchEnd。
+    host.mark_pending(&id);
+    assert!(host.in_flight(&id));
+
+    host.handle(HostTask::LaunchEnd(Box::new(LaunchFinished {
+        id: id.clone(),
+        session: String::new(),
+        outcome: LogOutcome::Crashed,
+        summary: "启动失败：找不到 Java".to_string(),
+    })));
+
+    assert!(
+        !host.pending.contains(&id),
+        "LaunchEnd 早于 LaunchStarted 时也必须清 pending（否则该实例本会话再也起不来）"
+    );
+    assert!(!host.in_flight(&id), "失败后要能重试");
+
+    let failed = instances_from_events({
+        host.refresh_instances();
+        host.drain_events()
+    })
+    .into_iter()
+    .find(|instance| instance.id == id)
+    .expect("实例存在");
+    assert_eq!(
+        failed.runtime,
+        InstanceRuntime::Failed {
+            reason: "启动失败：找不到 Java".to_string()
+        },
+        "早失败也要在磁贴上留下「失败/重试」，不能被 Idle 盖掉"
+    );
+}
+
+/// 从事件队列里取最后一次 `InstancesChanged`。
+fn instances_from_events(events: Vec<AppEvent>) -> Vec<crate::dto::InstanceSummary> {
+    events
+        .into_iter()
+        .rev()
+        .find_map(|event| match event {
+            AppEvent::Core(CoreEvent::InstancesChanged(instances)) => Some(instances),
+            _ => None,
+        })
+        .unwrap_or_default()
+}

crates/app/src/host/logs.rs

@@ -0,0 +1,342 @@
+//! 日志 / 诊断：会话索引 → 会话列表，事件 JSONL → 日志行，规则引擎 → 诊断卡片。
+//!
+//! 与 CLI `ull logs` / `ull diagnose` 同源（`launch::session_index` + `diagnose` 规则引擎）：
+//! 「同一份 jsonl 的两种读法」只有这一处实现（M39 ports/events.rs 的设计）。
+//! 实时滚动 = host 每拍尾随启动会话的 JSONL（只读新增字节），不额外开第二条事件通道。
+
+use std::io::{Read, Seek, SeekFrom};
+use std::path::{Path, PathBuf};
+
+use serde_json::Value;
+use unlucky_core::diagnose::collectors::{ExitSignal, SignalOrigin};
+use unlucky_core::diagnose::engine::{Diagnoser, DiagnosisInput};
+use unlucky_core::diagnose::loader::RuleLoader;
+use unlucky_core::launch::session_index::{self, SessionIndexEntry};
+
+use crate::dto::{
+    Diagnosis, DiagnosisReport, LogLevel, LogLine, LogOutcome, LogSession, SessionId,
+};
+
+use super::env::HostEnv;
+
+/// 送进规则引擎的默认尾巴行数（与 CLI 同值，避免两条路看到不同证据）。
+pub const DEFAULT_TAIL: usize = 2000;
+
+/// 日志页一次最多渲染的行数（超出的截断，避免大文件把 UI 拖死）。
+pub const MAX_RENDERED_LINES: usize = 2_000;
+
+/// 会话索引目录（`.ULL/data/agent/sessions`）。
+pub fn root(env: &HostEnv) -> PathBuf {
+    env.sessions_root()
+}
+
+/// 会话列表（新→旧）。
+pub fn sessions(env: &HostEnv) -> Vec<LogSession> {
+    let index = session_index::index_path(&root(env));
+    let mut entries = session_index::read_all(&index).unwrap_or_default();
+    entries.sort_by(|a, b| b.started_at.cmp(&a.started_at));
+    entries.iter().map(session_of).collect()
+}
+
+/// 索引条目 → 左栏会话行。
+pub fn session_of(entry: &SessionIndexEntry) -> LogSession {
+    LogSession {
+        id: entry.session_id.clone(),
+        instance: if entry.instance_name.is_empty() {
+            entry.instance_id.clone()
+        } else {
+            entry.instance_name.clone()
+        },
+        when: display_time(&entry.started_at),
+        outcome: outcome_of(entry),
+        duration_secs: entry.duration_ms / 1000,
+    }
+}
+
+/// 结局：静默失败 > 崩溃（非 0 / crash_found） > 正常。
+pub fn outcome_of(entry: &SessionIndexEntry) -> LogOutcome {
+    if entry.silent_failure {
+        LogOutcome::SilentFail
+    } else if entry.crash_found
+        || entry.exit_code.is_some_and(|code| code != 0)
+        || (entry.exit_code.is_none() && !entry.ended_at.is_empty())
+    {
+        LogOutcome::Crashed
+    } else {
+        LogOutcome::Ok
+    }
+}
+
+/// `2026-10-29T19:22:45.123Z` → `10-29 19:22`。
+pub fn display_time(started_at: &str) -> String {
+    let body = started_at.trim_end_matches('Z');
+    let Some((date, time)) = body.split_once('T') else {
+        return started_at.to_string();
+    };
+    let date = date.get(5..).unwrap_or(date);
+    let time = time.get(..5).unwrap_or(time);
+    format!("{date} {time}")
+}
+
+/// 事件流文件路径（`<sessions>/game/<log_path>`）。
+pub fn event_path(env: &HostEnv, entry: &SessionIndexEntry) -> PathBuf {
+    root(env).join("game").join(&entry.log_path)
+}
+
+/// 会话 id 或唯一前缀 → 索引条目。
+fn find(env: &HostEnv, key: &str) -> Option<SessionIndexEntry> {
+    let index = session_index::index_path(&root(env));
+    let entries = session_index::read_all(&index).ok()?;
+    if let Some(exact) = entries.iter().find(|entry| entry.session_id == key) {
+        return Some(exact.clone());
+    }
+    entries
+        .iter()
+        .find(|entry| entry.session_id.starts_with(key))
+        .cloned()
+}
+
+/// 事件 JSON → 一行日志（`stdout`/`stderr` 的 `payload.line`）。
+pub fn line_of(event: &Value) -> Option<LogLine> {
+    let text = event.pointer("/payload/line").and_then(Value::as_str)?;
+    let kind = event
+        .get("kind")
+        .and_then(Value::as_str)
+        .unwrap_or_default();
+    let level = match event
+        .pointer("/payload/level")
+        .and_then(Value::as_str)
+        .unwrap_or_default()
+    {
+        "error" => LogLevel::Error,
+        "warn" | "warning" => LogLevel::Warn,
+        "debug" | "trace" => LogLevel::Debug,
+        _ => {
+            if kind == "stderr" {
+                LogLevel::Warn
+            } else {
+                LogLevel::Info
+            }
+        }
+    };
+    Some(LogLine {
+        text: text.to_string(),
+        level,
+    })
+}
+
+/// 整个事件流 → 日志行（解析失败的行跳过，容忍被 kill 时截断的尾行）。
+pub fn read_lines(path: &Path) -> Vec<LogLine> {
+    let Ok(text) = std::fs::read_to_string(path) else {
+        return Vec::new();
+    };
+    text.lines()
+        .filter(|line| !line.trim().is_empty())
+        .filter_map(|line| serde_json::from_str::<Value>(line).ok())
+        .filter_map(|event| line_of(&event))
+        .collect()
+}
+
+/// 打开一个会话：日志行 + 规则引擎结论。
+pub fn open(env: &HostEnv, key: &str) -> (Vec<LogLine>, Option<DiagnosisReport>) {
+    let Some(entry) = find(env, key) else {
+        return (Vec::new(), None);
+    };
+    let path = event_path(env, &entry);
+    let lines = read_lines(&path);
+    let diagnosis = diagnose_lines(&entry, &lines);
+    (lines, diagnosis)
+}
+
+/// 规则引擎跑一遍（**规则先跑，模型补位**：这里只出规则结论）。
+pub fn diagnose_lines(entry: &SessionIndexEntry, lines: &[LogLine]) -> Option<DiagnosisReport> {
+    let stderr_text: String = lines
+        .iter()
+        .filter(|line| line.level == LogLevel::Error || line.level == LogLevel::Warn)
+        .map(|line| line.text.as_str())
+        .collect::<Vec<_>>()
+        .join("\n");
+    let body: String = lines
+        .iter()
+        .rev()
+        .take(DEFAULT_TAIL)
+        .map(|line| line.text.as_str())
+        .collect::<Vec<_>>()
+        .into_iter()
+        .rev()
+        .collect::<Vec<_>>()
+        .join("\n");
+    if body.is_empty() {
+        return None;
+    }
+    let error_lines = u32::try_from(
+        lines
+            .iter()
+            .filter(|line| line.level == LogLevel::Error)
+            .count(),
+    )
+    .unwrap_or(u32::MAX);
+    let exit = ExitSignal::classify(
+        entry.exit_code,
+        Some(entry.duration_ms),
+        error_lines,
+        &stderr_text,
+    );
+    let mut input = DiagnosisInput::new().with_exit(exit);
+    input.push_text(SignalOrigin::Stderr, body);
+    let loader = RuleLoader::embedded();
+    let report = Diagnoser::new(loader.rule_set().rules().to_vec()).analyze(&input);
+    let finding = report
+        .findings
+        .first()
+        .or_else(|| report.secondary.first())?;
+    Some(DiagnosisReport {
+        session: entry.session_id.clone(),
+        diagnosis: Diagnosis {
+            rule: finding.rule_id.clone(),
+            title: finding.message.clone(),
+            confidence: confidence_percent(finding.confidence),
+            hint: finding.detail.clone().unwrap_or_else(|| {
+                report
+                    .exit
+                    .as_ref()
+                    .map(|exit| exit.exit_type.as_str().to_string())
+                    .unwrap_or_else(|| "未知退出".to_string())
+            }),
+            fix: finding
+                .materialized_actions()
+                .first()
+                .map(|action| action.tool.to_string()),
+        },
+    })
+}
+
+/// 0.0~1.0 → 0~100（四舍五入）。
+pub fn confidence_percent(confidence: f32) -> u8 {
+    let percent = (confidence.clamp(0.0, 1.0) * 100.0).round();
+    u8::try_from(percent as u32).unwrap_or(100)
+}
+
+/// 导入崩溃日志（`hs_err_pid*.log` / `crash-*.txt` / `latest.log`）做规则分析。
+///
+/// 文件名含 `hs_err` 时先走 `hs_err::parse`（结构化字段进规则引擎），否则整份文本当信号喂进去。
+pub fn analyze_crash_file(path: &str) -> Result<(String, DiagnosisReport), String> {
+    let path = Path::new(path);
+    if !path.is_file() {
+        return Err(format!("找不到崩溃日志：{}", path.display()));
+    }
+    let text = std::fs::read_to_string(path).map_err(|error| format!("读崩溃日志失败：{error}"))?;
+    let name = path
+        .file_name()
+        .map(|name| name.to_string_lossy().to_string())
+        .unwrap_or_else(|| "crash.log".to_string());
+    let is_hs_err = name.contains("hs_err");
+    let mut input = DiagnosisInput::new();
+    if is_hs_err {
+        input.push_hs_err(unlucky_core::diagnose::hs_err::parse(&text));
+    }
+    input.push_text(
+        if is_hs_err {
+            SignalOrigin::HsErr
+        } else if name.contains("crash") {
+            SignalOrigin::CrashReport
+        } else {
+            SignalOrigin::LatestLog
+        },
+        text,
+    );
+    let loader = RuleLoader::embedded();
+    let report = Diagnoser::new(loader.rule_set().rules().to_vec()).analyze(&input);
+    let finding = report
+        .findings
+        .first()
+        .or_else(|| report.secondary.first())
+        .ok_or_else(|| "规则引擎没有从这份日志里认出已知问题".to_string())?;
+    Ok((
+        format!("导入的日志：{name}"),
+        DiagnosisReport {
+            session: format!("file:{name}"),
+            diagnosis: Diagnosis {
+                rule: finding.rule_id.clone(),
+                title: finding.message.clone(),
+                confidence: confidence_percent(finding.confidence),
+                hint: finding
+                    .detail
+                    .clone()
+                    .unwrap_or_else(|| "规则引擎命中（详见证据行）".to_string()),
+                fix: finding
+                    .materialized_actions()
+                    .first()
+                    .map(|action| action.tool.to_string()),
+            },
+        },
+    ))
+}
+
+/// 实时尾随器：只读文件新增的字节，解析出完整的 JSON 行。
+#[derive(Debug, Default)]
+pub struct Tail {
+    path: Option<PathBuf>,
+    session: Option<SessionId>,
+    offset: u64,
+}
+
+impl Tail {
+    /// 开始尾随一个会话。
+    pub fn attach(&mut self, path: PathBuf, session: &str) {
+        self.path = Some(path);
+        self.session = Some(session.to_string());
+        self.offset = 0;
+    }
+
+    /// 停止尾随。
+    pub fn detach(&mut self) {
+        self.path = None;
+        self.session = None;
+        self.offset = 0;
+    }
+
+    /// 当前尾随的会话。
+    pub fn session(&self) -> Option<&str> {
+        self.session.as_deref()
+    }
+
+    /// 读新行（返回 `(会话 id, 新行)`；没有新内容返回 `None`）。
+    pub fn poll(&mut self) -> Option<(String, Vec<LogLine>)> {
+        let path = self.path.clone()?;
+        let session = self.session.clone()?;
+        let file = std::fs::File::open(&path).ok()?;
+        let len = file.metadata().ok()?.len();
+        if len <= self.offset {
+            return None;
+        }
+        let mut file = file;
+        file.seek(SeekFrom::Start(self.offset)).ok()?;
+        let mut buffer = String::new();
+        file.read_to_string(&mut buffer).ok()?;
+        // 只吃到最后一个换行：半行留到下一拍（避免把 JSON 截断解析成脏行）
+        let last_newline = buffer.rfind('\n')?;
+        let complete = &buffer[..=last_newline];
+        self.offset += u64::try_from(complete.len()).unwrap_or(u64::MAX);
+        let lines: Vec<LogLine> = complete
+            .lines()
+            .filter(|line| !line.trim().is_empty())
+            .filter_map(|line| serde_json::from_str::<Value>(line).ok())
+            .filter_map(|event| line_of(&event))
+            .collect();
+        Some((session, lines))
+    }
+}
+
+/// 会话是否已收尾（索引里出现 `ended_at` 或文件停止增长超过一拍）。
+pub fn session_finished(env: &HostEnv, session: &str) -> bool {
+    let index = session_index::index_path(&root(env));
+    session_index::read_all(&index)
+        .unwrap_or_default()
+        .iter()
+        .any(|entry| entry.session_id == session && !entry.ended_at.is_empty())
+}
+
+#[cfg(test)]
+#[path = "logs_tests.rs"]
+mod tests;

crates/app/src/host/logs_tests.rs

@@ -0,0 +1,86 @@
+//! host/logs.rs 的单测（拆文件守 400 行上限）。
+
+use super::*;
+
+#[test]
+fn time_display_and_outcomes() {
+    assert_eq!(display_time("2026-10-29T19:22:45.123Z"), "10-29 19:22");
+    assert_eq!(display_time("nope"), "nope");
+    let mut entry = SessionIndexEntry {
+        v: 1,
+        session_id: "s".to_string(),
+        instance_id: String::new(),
+        instance_name: String::new(),
+        game_version: String::new(),
+        started_at: String::new(),
+        ended_at: "2026-10-29T19:22:45Z".to_string(),
+        duration_ms: 1000,
+        exit_code: Some(0),
+        exit_type: Some("normal".to_string()),
+        silent_failure: false,
+        window_detected: true,
+        event_count: 1,
+        log_path: "s.jsonl".to_string(),
+        crash_found: false,
+        diagnosis_top: None,
+    };
+    assert_eq!(outcome_of(&entry), LogOutcome::Ok);
+    entry.exit_code = Some(1);
+    assert_eq!(outcome_of(&entry), LogOutcome::Crashed);
+    entry.silent_failure = true;
+    assert_eq!(outcome_of(&entry), LogOutcome::SilentFail);
+}
+
+#[test]
+fn lines_map_levels_and_skip_non_line_events() {
+    let stdout = serde_json::json!({"kind":"stdout","payload":{"line":"hi","level":"info"}});
+    assert_eq!(line_of(&stdout).unwrap().level, LogLevel::Info);
+    let stderr = serde_json::json!({"kind":"stderr","payload":{"line":"boom","level":"error"}});
+    assert_eq!(line_of(&stderr).unwrap().level, LogLevel::Error);
+    let other = serde_json::json!({"kind":"cmd_built","payload":{"argv":[]}});
+    assert!(line_of(&other).is_none());
+}
+
+#[test]
+fn tail_only_consumes_complete_lines() {
+    let dir = std::env::temp_dir().join(format!("ull-host-tail-{}", std::process::id()));
+    let _ = std::fs::remove_dir_all(&dir);
+    std::fs::create_dir_all(&dir).expect("目录");
+    let path = dir.join("s.jsonl");
+    std::fs::write(
+        &path,
+        "{\"kind\":\"stdout\",\"payload\":{\"line\":\"one\"}}\n",
+    )
+    .expect("写");
+    let mut tail = Tail::default();
+    tail.attach(path.clone(), "s");
+    let (session, lines) = tail.poll().expect("首拍有新行");
+    assert_eq!(session, "s");
+    assert_eq!(lines.len(), 1);
+    assert!(tail.poll().is_none(), "没有新增就不该再产出");
+
+    // 半行不消费
+    let mut text = std::fs::read_to_string(&path).expect("读");
+    text.push_str("{\"kind\":\"stdout\",\"payload\":{\"line\":\"tw");
+    std::fs::write(&path, text).expect("写");
+    assert!(tail.poll().is_none(), "半个 JSON 行不能解析");
+    let mut text = std::fs::read_to_string(&path).expect("读");
+    text.push_str("o\"}}\n");
+    std::fs::write(&path, text).expect("写");
+    let (_, lines) = tail.poll().expect("补全后应产出");
+    assert_eq!(lines[0].text, "two");
+    std::fs::remove_dir_all(&dir).ok();
+}
+
+#[test]
+fn crash_import_reports_missing_file() {
+    let err = analyze_crash_file("D:/definitely/missing/hs_err_pid1.log").unwrap_err();
+    assert!(err.contains("找不到崩溃日志"), "{err}");
+}
+
+#[test]
+fn confidence_percent_is_rounded_and_clamped() {
+    assert_eq!(confidence_percent(0.923), 92);
+    assert_eq!(confidence_percent(-1.0), 0);
+    assert_eq!(confidence_percent(2.0), 100);
+}

crates/app/src/host/meter.rs

@@ -0,0 +1,70 @@
+//! 安装进度的记账器（文件计数 / 字节 / 速度 / ETA）。
+//!
+//! `execute` 的文件级回调已经把每个文件的结局给了我们，这里只做聚合；
+//! 速度用相邻两次采样的字节差算（core 的事件只给绝对值）。
+
+use std::sync::Arc;
+use std::time::Instant;
+
+use unlucky_core::game::install::{FileOutcome, FileStatus, ProgressSink};
+
+use crate::dto::{derive_speed, CreateRequest, InstallProgressView, InstallStage};
+
+use super::install::loader_label;
+use super::job::{HostTask, JobSender};
+/// 一次安装的上下文（进度回调共享）。
+pub(super) struct Meter {
+    pub(super) progress: InstallProgressView,
+    previous: Option<(u64, Instant)>,
+}
+
+impl Meter {
+    pub(super) fn new(request: &CreateRequest) -> Self {
+        Self {
+            progress: InstallProgressView::start(
+                &request.version,
+                &request.instance_name(),
+                &loader_label(request.loader, &request.loader_version),
+            ),
+            previous: None,
+        }
+    }
+
+    /// 换阶段（重置速度采样）。
+    pub(super) fn stage(&mut self, stage: InstallStage, message: &str) {
+        self.progress.stage = stage;
+        self.progress.message = message.to_string();
+        self.previous = None;
+    }
+
+    /// 记账一个文件的结局。
+    pub(super) fn note(&mut self, outcome: &FileOutcome) {
+        self.progress.files_done += 1;
+        if outcome.status != FileStatus::Skipped {
+            self.progress.bytes_done = self.progress.bytes_done.saturating_add(outcome.bytes);
+        }
+        let now = Instant::now();
+        if let Some(previous) = self.previous {
+            if let Some((speed, eta)) = derive_speed(
+                previous,
+                (self.progress.bytes_done, now),
+                self.progress.bytes_total,
+            ) {
+                self.progress.speed_bps = speed;
+                self.progress.eta_secs = eta;
+            }
+        }
+        self.previous = Some((self.progress.bytes_done, now));
+    }
+}
+
+/// 进度 sink（`execute` 的文件级回调）。
+pub(super) fn sink_for(tx: JobSender, meter: Arc<std::sync::Mutex<Meter>>) -> ProgressSink {
+    Arc::new(move |outcome: &FileOutcome| {
+        let Ok(mut meter) = meter.lock() else {
+            return;
+        };
+        meter.note(outcome);
+        let _ = tx.send(HostTask::Install(Box::new(meter.progress.clone())));
+    })
+}

crates/app/src/host/mod.rs

@@ -0,0 +1,341 @@
+//! 真实后端：把 core（game/launch/install/auth/java/diagnose/setting）装配成 GUI 的 host。
+//!
+//! 边界：本模块是整个 app 里**唯一**允许 `use unlucky_core::…` 的地方（连同 `settings_bridge`）；
+//! 出口只有 [`crate::dto`] 的快照/事件。线程模型：
+//!
+//! ```text
+//! dispatch(AppCommand) ──► 立即动作（读盘/写设置）或 spawn 后台线程
+//! 后台线程 ──HostTask──► rx ──tick()──► CoreEvent ──► state.apply()
+//! tick() 另外每 ~600ms 尾随一次运行中会话的 JSONL（实时日志滚动）
+//! ```
+//!
+//! AI 对话暂时仍由 [`MockBackend`] 提供脚本回复（agent 的 GUI host 是后续 mission）；
+//! 其余页面全部走真实 core。
+
+mod accounts;
+mod dispatch;
+mod engine;
+pub mod env;
+mod game;
+mod handle;
+mod identity;
+mod install;
+mod java;
+mod job;
+mod launch;
+mod logs;
+mod meter;
+mod settings;
+mod versions;
+
+use std::collections::{BTreeMap, BTreeSet, VecDeque};
+use std::time::Duration;
+
+use crate::dto::{
+    AccountView, AppCommand, AppEvent, Backend, CoreEvent, DiagnosisReport, InstallProgressView,
+    InstanceRuntime, JavaChainStep, NoticeView,
+};
+use crate::mock::MockBackend;
+use crate::toast::{Toast, ToastKind};
+
+use accounts::LoginJob;
+pub use env::HostEnv;
+use job::{HostTask, JobReceiver, JobSender};
+
+/// 每拍最多处理的后台消息数（防止一次 tick 吃掉整帧预算）。
+const MAX_TASKS_PER_TICK: usize = 64;
+
+/// 实时日志尾随间隔（拍数，33ms/拍 → 约 600ms 一次）。
+const TAIL_POLL_TICKS: u64 = 18;
+
+/// 一次在跑的启动（并发启动时按实例 id 区分，停止/尾随都不会串到别的实例）。
+#[derive(Debug, Clone, PartialEq, Eq)]
+struct LiveLaunch {
+    instance: String,
+    session: String,
+    pid: u32,
+}
+
+/// 真实 host。
+pub struct CoreHost {
+    env: HostEnv,
+    events: VecDeque<AppEvent>,
+    tx: JobSender,
+    rx: JobReceiver,
+    ticks: u64,
+    /// 当前启动账户 id（内存态；跨会话持久化要 core schema 增键，见 handoff）
+    active_account: Option<String>,
+    accounts: Vec<AccountView>,
+    login: Option<LoginJob>,
+    java_chain: Vec<JavaChainStep>,
+    java_busy: bool,
+    java_message: String,
+    install: Option<InstallProgressView>,
+    notices: Vec<NoticeView>,
+    /// 在跑的启动（实例 → 会话 → pid；支持多个实例同时启动，停止按 id 找正确的 pid）
+    launches: Vec<LiveLaunch>,
+    /// 已受理但后台线程还没回报 `LaunchStarted` 的实例（防「启动中重复点启动」起第二个进程）
+    pending: BTreeSet<String>,
+    /// 上次启动失败的实例与原因（刷新快照时保住磁贴的「失败/重试」外观）
+    failed: BTreeMap<String, String>,
+    /// 实时日志尾随器
+    tail: logs::Tail,
+    /// AI 对话的临时后端（agent GUI host 落地前的占位）
+    chat: MockBackend,
+    /// 当前安装任务的取消标记（阶段边界检查）
+    install_cancel: Option<std::sync::Arc<std::sync::atomic::AtomicBool>>,
+}
+
+impl CoreHost {
+    /// 按便携数据根装配；解析不出数据根返回 `None`（调用方退回 mock）。
+    pub fn open() -> Option<Self> {
+        HostEnv::resolve().map(Self::new)
+    }
+
+    /// 用给定环境装配（截图/单测通道）。
+    pub fn new(env: HostEnv) -> Self {
+        Self::build(env, true)
+    }
+
+    /// 单测用：不跑 `refresh_all`（不起版本清单网络线程），其余装配一致。
+    #[cfg(test)]
+    pub(crate) fn headless(env: HostEnv) -> Self {
+        Self::build(env, false)
+    }
+
+    fn build(env: HostEnv, refresh: bool) -> Self {
+        let (tx, rx) = job::channel();
+        game::ensure_root(&env);
+        let mut host = Self {
+            env,
+            events: VecDeque::new(),
+            tx,
+            rx,
+            ticks: 0,
+            active_account: None,
+            accounts: Vec::new(),
+            login: None,
+            java_chain: Vec::new(),
+            java_busy: false,
+            java_message: String::new(),
+            install: None,
+            notices: Vec::new(),
+            launches: Vec::new(),
+            pending: BTreeSet::new(),
+            failed: BTreeMap::new(),
+            tail: logs::Tail::default(),
+            chat: MockBackend::default(),
+            install_cancel: None,
+        };
+        if refresh {
+            host.refresh_all();
+        }
+        host
+    }
+
+    /// 数据根（截图/诊断展示用）。
+    pub fn env(&self) -> &HostEnv {
+        &self.env
+    }
+
+    fn send(&mut self, event: CoreEvent) {
+        self.events.push_back(AppEvent::Core(event));
+    }
+
+    fn toast(&mut self, kind: ToastKind, text: impl Into<String>) {
+        self.events.push_back(AppEvent::Toast(Toast {
+            id: 0,
+            kind,
+            text: text.into(),
+            remaining_ms: 0,
+        }));
+    }
+
+    /// 全量刷新：实例 / 会话 / 账户 / 设置 / Java，并触发一次版本清单拉取。
+    pub fn refresh_all(&mut self) {
+        self.refresh_instances();
+        self.send(CoreEvent::LogSessionsChanged(logs::sessions(&self.env)));
+        self.refresh_accounts();
+        self.send(CoreEvent::SettingsChanged(settings::groups(&self.env)));
+        self.refresh_java();
+        versions::spawn_list(self.env.clone(), self.tx.clone());
+    }
+
+    /// 重建实例快照，并把**真实运行时**盖回去。
+    ///
+    /// `game::instances` 只读盘（每条都是 `Idle`），所以在跑的实例必须在重建后按
+    /// host 自己的启动表覆写 `Running{pid}`/`Busy`，否则任意一次刷新（装版本成功、
+    /// 加删账户、另一实例收尾）都会把磁贴打回 Idle：停止键与「运行中」条消失，
+    /// 进程还在跑却再也停不下来。
+    fn refresh_instances(&mut self) {
+        let mut instances = game::instances(&self.env);
+        for instance in &mut instances {
+            if let Some(live) = self
+                .launches
+                .iter()
+                .find(|live| live.instance == instance.id)
+            {
+                instance.runtime = InstanceRuntime::Running { pid: live.pid };
+            } else if self.pending.contains(&instance.id) {
+                instance.runtime = InstanceRuntime::Busy {
+                    stage: crate::dto::LaunchStage::Launch,
+                    progress: crate::dto::Progress { done: 0, total: 1 },
+                };
+            } else if let Some(reason) = self.failed.get(&instance.id) {
+                instance.runtime = InstanceRuntime::Failed {
+                    reason: reason.clone(),
+                };
+            }
+        }
+        self.send(CoreEvent::InstancesChanged(instances));
+    }
+
+    fn refresh_accounts(&mut self) {
+        self.accounts = accounts::accounts(&self.env, self.active_account.as_deref());
+        if self.active_account.is_none() {
+            // 默认选中第一个账户（没有账户时保持 None = 离线占位）
+            self.active_account = self.accounts.first().map(|account| account.id.clone());
+            self.accounts = accounts::accounts(&self.env, self.active_account.as_deref());
+        }
+        self.send(CoreEvent::AccountsChanged(self.accounts.clone()));
+    }
+
+    fn refresh_java(&mut self) {
+        let page = java::page(
+            &self.env,
+            self.java_chain.clone(),
+            self.java_busy,
+            &self.java_message,
+        );
+        self.send(CoreEvent::JavaChanged(page));
+    }
+
+    fn push_notice(&mut self, notice: NoticeView) {
+        self.notices.retain(|existing| existing.id != notice.id);
+        self.notices.push(notice);
+        self.send(CoreEvent::NoticesChanged(self.notices.clone()));
+    }
+
+    /// 打开一个会话（日志行 + 诊断）。
+    fn open_session(&mut self, id: &str) {
+        let (lines, diagnosis) = logs::open(&self.env, id);
+        self.send(CoreEvent::LogLinesChanged(lines));
+        self.send(CoreEvent::DiagnosisReady(diagnosis.unwrap_or(
+            DiagnosisReport {
+                session: id.to_string(),
+                diagnosis: crate::dto::Diagnosis {
+                    rule: String::new(),
+                    title: "该会话没有命中已知规则".to_string(),
+                    confidence: 0,
+                    hint: "可点「让 AI 详解」把日志交给模型进一步分析".to_string(),
+                    fix: None,
+                },
+            },
+        )));
+    }
+
+    /// 由实例名/版本 id 找启动目标。
+    fn launch_target(&self, id: &str) -> Option<launch::LaunchTarget> {
+        let instance = game::instances(&self.env)
+            .into_iter()
+            .find(|instance| instance.id == id || instance.name == id)?;
+        Some(launch::LaunchTarget {
+            id: instance.id,
+            name: instance.name,
+            version_id: instance.version_id,
+            account: self.active_account.clone(),
+        })
+    }
+
+    /// 某实例是否已在启动/运行（`pending` 与 `launches` 的并集）。
+    ///
+    /// 只查 `launches` 不够：`launch::start` 到后台线程回报 `LaunchStarted` 之间有窗口，
+    /// 这期间重复点启动会起第二个进程、并把旧 pid 在启动表里顶掉（旧进程变孤儿）。
+    fn in_flight(&self, key: &str) -> bool {
+        self.pending.contains(key) || self.launches.iter().any(|live| live.instance == key)
+    }
+
+    /// 标记「已受理、等后台线程回报」（`launch::start` 之后的窗口）。
+    ///
+    /// 单测也走这个入口而不是直接改 `pending`，保证测的是真实状态流转。
+    fn mark_pending(&mut self, id: &str) {
+        self.pending.insert(id.to_string());
+        self.failed.remove(id);
+    }
+
+    fn start_launch(&mut self, id: &str) {
+        if self.in_flight(id) {
+            self.toast(ToastKind::Warn, "这个实例已经在启动/运行中");
+            return;
+        }
+        let Some(target) = self.launch_target(id) else {
+            self.toast(ToastKind::Error, format!("找不到实例 {id}"));
+            return;
+        };
+        let instance_id = target.id.clone();
+        if self.in_flight(&instance_id) {
+            self.toast(ToastKind::Warn, "这个实例已经在启动/运行中");
+            return;
+        }
+        self.mark_pending(&instance_id);
+        if let Some(notice) = game::mode_change_notice(&self.env, &instance_id) {
+            self.push_notice(notice);
+        }
+        self.send(CoreEvent::InstanceRuntimeChanged {
+            id: instance_id.clone(),
+            runtime: InstanceRuntime::Busy {
+                stage: crate::dto::LaunchStage::Launch,
+                progress: crate::dto::Progress { done: 0, total: 1 },
+            },
+        });
+        launch::start(self.env.clone(), self.tx.clone(), target);
+    }
+
+    /// 某实例在跑的 pid（按实例 id 查启动表；不再有「最近一次启动」这种单槽）。
+    ///
+    /// 兜底分支读实例快照的 `Running { pid }`：host 自己发的运行时事件会写回快照，
+    /// 但快照是重建的（`game::instances` 每次 Idle），所以这层只是给将来留的口。
+    fn running_pid(&self, id: &str) -> Option<u32> {
+        if let Some(live) = self.launches.iter().find(|live| live.instance == id) {
+            return Some(live.pid);
+        }
+        game::instances(&self.env)
+            .into_iter()
+            .find(|instance| instance.id == id)
+            .and_then(|instance| match instance.runtime {
+                InstanceRuntime::Running { pid } => Some(pid),
+                _ => None,
+            })
+    }
+}
+
+impl Backend for CoreHost {
+    fn drain_events(&mut self) -> Vec<AppEvent> {
+        self.events.drain(..).collect()
+    }
+
+    fn dispatch(&mut self, command: AppCommand) {
+        self.dispatch_command(command);
+    }
+
+    fn tick(&mut self, elapsed: Duration) {
+        self.chat.tick(elapsed);
+        for event in self.chat.drain_events() {
+            self.events.push_back(event);
+        }
+        for _ in 0..MAX_TASKS_PER_TICK {
+            let Ok(task) = self.rx.try_recv() else {
+                break;
+            };
+            self.handle(task);
+        }
+        self.ticks += 1;
+        if self.ticks.is_multiple_of(TAIL_POLL_TICKS) {
+            self.poll_tail();
+        }
+    }
+}
+
+#[cfg(test)]
+#[path = "launch_state_tests.rs"]
+mod launch_state_tests;

crates/app/src/host/settings.rs

@@ -0,0 +1,398 @@
+//! 设置页分组：按 `core::setting` schema 的键生成行，写回走 `SettingStore::set`。
+//!
+//! 三件纪律（AGENTS §6）：
+//! 1. 读写同一份 `<数据根>/config/launcher.json`（与 `ull config set` / AI `set_config` 同源）；
+//! 2. 不自己拼 JSON，也不绕 schema（非法键/越界值由 `store.set` 拒绝）；
+//! 3. 这里只认「键名 + 字符串值」，领域语义留在 core。
+//!
+//! 分组 id 与设置页子导航同名：`download` / `java` / `data` / `ai` / `mcp`。
+
+use serde_json::Value;
+use unlucky_core::game::java::JdkVendor;
+
+use crate::dto::{SettingGroupView, SettingRowView};
+
+use super::env::HostEnv;
+
+/// 全部设置分组（设置页右栏一次拿全，切分组不再请求）。
+pub fn groups(env: &HostEnv) -> Vec<SettingGroupView> {
+    vec![
+        download_group(env),
+        java_group(env),
+        data_group(env),
+        ai_group(env),
+        mcp_group(env),
+    ]
+}
+
+/// 读一个键的字符串值（缺省给空串）。
+fn text(env: &HostEnv, key: &str) -> String {
+    env.store()
+        .doc()
+        .effective_str(key)
+        .unwrap_or_default()
+        .to_string()
+}
+
+/// 读一个键的整数（缺省给 `fallback`）。
+fn int(env: &HostEnv, key: &str, fallback: i64) -> i64 {
+    env.store()
+        .effective(key)
+        .and_then(Value::as_i64)
+        .unwrap_or(fallback)
+}
+
+/// 读一个键的布尔（缺省给 `fallback`）。
+fn flag(env: &HostEnv, key: &str, fallback: bool) -> bool {
+    env.store()
+        .effective(key)
+        .and_then(Value::as_bool)
+        .unwrap_or(fallback)
+}
+
+/// 枚举值在选项表里的序号（找不到给 0）。
+fn selected(options: &[&str], value: &str) -> i32 {
+    options
+        .iter()
+        .position(|option| *option == value)
+        .map(|index| i32::try_from(index).unwrap_or(0))
+        .unwrap_or(0)
+}
+
+/// 下载（D7）：并发/重试/地区/镜像偏好/代理。
+fn download_group(env: &HostEnv) -> SettingGroupView {
+    let concurrency = int(env, "download.concurrency", 8).to_string();
+    let retry = int(env, "download.retry_limit", 3).to_string();
+    let concurrency_options = ["4", "8", "16"];
+    let retry_options = ["0", "1", "3", "5"];
+    let regions = ["auto", "cn", "global"];
+    let mirrors = ["auto", "official", "mirror"];
+    let proxies = ["none", "system", "manual"];
+    let region_value = text(env, "download.region");
+    let mirror_value = text(env, "download.mirror_preference");
+    let proxy_value = text(env, "download.proxy_mode");
+    SettingGroupView::new("download", "下载与镜像（D7）")
+        .with(SettingRowView::choice(
+            "download.concurrency",
+            "并发数",
+            "同时下载的文件数（海量小文件，16 路足够压满带宽）",
+            &concurrency_options,
+            selected(&concurrency_options, &concurrency),
+        ))
+        .with(SettingRowView::choice(
+            "download.retry_limit",
+            "单文件重试次数",
+            "失败后换源重试的上限",
+            &retry_options,
+            selected(&retry_options, &retry),
+        ))
+        .with(SettingRowView::choice(
+            "download.region",
+            "地区判定",
+            "auto = 时区+语言+探测；决定是否优先国内镜像",
+            &regions,
+            selected(
+                &regions,
+                if region_value.is_empty() {
+                    "auto"
+                } else {
+                    &region_value
+                },
+            ),
+        ))
+        .with(SettingRowView::choice(
+            "download.mirror_preference",
+            "镜像偏好",
+            "auto = 按健康度评分；official = 官方源优先",
+            &mirrors,
+            selected(
+                &mirrors,
+                if mirror_value.is_empty() {
+                    "auto"
+                } else {
+                    &mirror_value
+                },
+            ),
+        ))
+        .with(SettingRowView::choice(
+            "download.proxy_mode",
+            "代理模式",
+            "none / system（跟随系统）/ manual（下面填地址）",
+            &proxies,
+            selected(
+                &proxies,
+                if proxy_value.is_empty() {
+                    "none"
+                } else {
+                    &proxy_value
+                },
+            ),
+        ))
+        .with(SettingRowView::text(
+            "download.proxy_url",
+            "HTTP 代理",
+            "manual 模式生效；留空则用系统代理",
+            &text(env, "download.proxy_url"),
+        ))
+        .with(SettingRowView::action(
+            "download.action.detect_region",
+            "重新检测地区",
+            "清掉 24h 地区缓存，下次下载重新判定",
+            "detect_region",
+        ))
+}
+
+/// Java（D13/D23）：自动安装/内存/选路/发行版优先级。
+fn java_group(env: &HostEnv) -> SettingGroupView {
+    let memory = int(env, "java.default_memory_mb", 2048).to_string();
+    let memory_options = ["1024", "2048", "4096", "8192"];
+    let priority: Vec<String> = env
+        .store()
+        .effective("java.vendorPriority")
+        .and_then(Value::as_array)
+        .map(|items| {
+            items
+                .iter()
+                .filter_map(Value::as_str)
+                .map(str::to_string)
+                .collect()
+        })
+        .unwrap_or_default();
+    let priority_text = if priority.is_empty() {
+        "地区默认序（Temurin → …）".to_string()
+    } else {
+        priority.join(" → ")
+    };
+    let roots = super::engine::java_scan_roots(env);
+    SettingGroupView::new("java", "Java（D13）")
+        .with(SettingRowView::toggle(
+            "java.auto_install",
+            "缺 Java 时自动下载",
+            "按回退链装一个托管 JDK（基准 JDK17）",
+            flag(env, "java.auto_install", true),
+        ))
+        .with(SettingRowView::choice(
+            "java.default_memory_mb",
+            "默认最大堆内存",
+            "实例没单独指定时用这个值（MB）",
+            &memory_options,
+            selected(&memory_options, &memory),
+        ))
+        .with(SettingRowView::text(
+            "java.selected_path",
+            "指定 Java 可执行文件",
+            "留空 = 自动挑（托管 > JAVA_HOME > PATH）",
+            &text(env, "java.selected_path"),
+        ))
+        .with(SettingRowView::text(
+            "java.installRoot",
+            "托管 JDK 安装根",
+            "留空 = 按数据目录模式派生（portable 进数据根 / standard 进系统目录）",
+            &text(env, "java.installRoot"),
+        ))
+        .with(SettingRowView::text(
+            "java.extra_args",
+            "附加 JVM 参数",
+            "原样拼到命令行尾部",
+            &text(env, "java.extra_args"),
+        ))
+        .with(SettingRowView::read_only(
+            "发行版优先级（java.vendorPriority）",
+            &priority_text,
+        ))
+        .with(SettingRowView::read_only(
+            "托管根",
+            &roots
+                .iter()
+                .map(|root| root.display().to_string())
+                .collect::<Vec<_>>()
+                .join(" · "),
+        ))
+}
+
+/// 数据目录（D6 三模式）。
+fn data_group(env: &HostEnv) -> SettingGroupView {
+    let modes = ["portable", "standard", "custom"];
+    let mode = env.mode().as_str().to_string();
+    SettingGroupView::new("data", "数据目录（D6 三模式）")
+        .with(SettingRowView::choice(
+            "core.data_mode",
+            "存储模式",
+            "便携（运行目录）/ 标准（系统应用数据目录）/ 自定义",
+            &modes,
+            selected(&modes, &mode),
+        ))
+        .with(SettingRowView::text(
+            "core.data_custom_root",
+            "自定义根目录",
+            "custom 模式生效（绝对路径）",
+            &text(env, "core.data_custom_root"),
+        ))
+        .with(SettingRowView::read_only(
+            "启动器数据目录",
+            &env.data.launcher_home.display().to_string(),
+        ))
+        .with(SettingRowView::read_only(
+            "游戏目录",
+            &env.data.game_home.display().to_string(),
+        ))
+        .with(SettingRowView::read_only(
+            "生效模式",
+            &format!("{}（改数据根需重启启动器）", env.mode()),
+        ))
+}
+
+/// AI（D4）：开关/端点/模型/YOLO。
+fn ai_group(env: &HostEnv) -> SettingGroupView {
+    let providers = ["openai_compatible", "anthropic", "ollama"];
+    let provider = text(env, "ai.provider");
+    SettingGroupView::new("ai", "AI 助手（D4）")
+        .with(SettingRowView::toggle(
+            "ai.enabled",
+            "启用 AI 助手",
+            "关闭后规则引擎诊断仍可用",
+            flag(env, "ai.enabled", true),
+        ))
+        .with(SettingRowView::choice(
+            "ai.provider",
+            "模型端点",
+            "OpenAI 兼容（含本地 llama.cpp）/ Anthropic / Ollama",
+            &providers,
+            selected(
+                &providers,
+                if provider.is_empty() {
+                    "openai_compatible"
+                } else {
+                    &provider
+                },
+            ),
+        ))
+        .with(SettingRowView::text(
+            "ai.base_url",
+            "端点 base_url",
+            "如 http://127.0.0.1:8080/v1",
+            &text(env, "ai.base_url"),
+        ))
+        .with(SettingRowView::text(
+            "ai.model",
+            "模型名",
+            "如 deepseek-chat",
+            &text(env, "ai.model"),
+        ))
+        .with(SettingRowView::toggle(
+            "ai.yolo",
+            "YOLO 模式",
+            "跳过确认弹窗（审计照记；账户/凭据操作永不 YOLO）",
+            flag(env, "ai.yolo", false),
+        ))
+}
+
+/// M39 的对外 MCP server（默认关、默认只读）。
+fn mcp_group(env: &HostEnv) -> SettingGroupView {
+    let port = int(env, "agent.mcp.port", 47_823);
+    SettingGroupView::new("mcp", "MCP server（M39）")
+        .with(SettingRowView::toggle(
+            "agent.mcp.enabled",
+            "对外提供 MCP server",
+            "127.0.0.1 上的 Streamable HTTP（stdio 需显式启动）",
+            flag(env, "agent.mcp.enabled", false),
+        ))
+        .with(SettingRowView::text(
+            "agent.mcp.port",
+            "端口",
+            "1024~65535，只绑 127.0.0.1",
+            &port.to_string(),
+        ))
+        .with(SettingRowView::toggle(
+            "agent.mcp.allow_write",
+            "允许外部客户端写配置",
+            "默认只读；写仍受 schema 白名单与分级确认约束",
+            flag(env, "agent.mcp.allow_write", false),
+        ))
+        .with(SettingRowView::read_only(
+            "客户端地址",
+            &format!("http://127.0.0.1:{port}/mcp（令牌见 agent.mcp.token，AI 不可写）"),
+        ))
+}
+
+/// 写一条设置。`value` 是字符串形态，按 schema 键的类型转换后交 `store.set`。
+///
+/// # Errors
+///
+/// 未知键、值类型不符、越界、落盘失败时返回用户可读文案。
+pub fn set(env: &HostEnv, key: &str, value: &str) -> Result<(), String> {
+    if key == "download.action.detect_region" {
+        return detect_region(env);
+    }
+    let parsed = parse_value(key, value)?;
+    let mut store = env.store();
+    store
+        .set(key, parsed)
+        .map_err(|error| format!("设置 {key} 失败：{error}"))?;
+    store
+        .save()
+        .map_err(|error| format!("保存设置失败：{error}"))?;
+    Ok(())
+}
+
+/// 键 → 正确类型的 JSON 值（schema 会再校验范围/枚举）。
+fn parse_value(key: &str, value: &str) -> Result<Value, String> {
+    if matches!(key, "download.concurrency" | "download.retry_limit") {
+        let number: u32 = value
+            .trim()
+            .parse()
+            .map_err(|_| format!("{key} 需要整数：{value}"))?;
+        return Ok(Value::from(number));
+    }
+    if matches!(key, "java.default_memory_mb" | "agent.mcp.port") {
+        let number: u32 = value
+            .trim()
+            .parse()
+            .map_err(|_| format!("{key} 需要整数：{value}"))?;
+        return Ok(Value::from(number));
+    }
+    if matches!(
+        key,
+        "java.auto_install"
+            | "ai.enabled"
+            | "ai.yolo"
+            | "agent.mcp.enabled"
+            | "agent.mcp.allow_write"
+    ) {
+        let flag = match value.trim().to_ascii_lowercase().as_str() {
+            "1" | "true" | "on" | "yes" => true,
+            "0" | "false" | "off" | "no" => false,
+            _ => return Err(format!("{key} 需要布尔值：{value}")),
+        };
+        return Ok(Value::Bool(flag));
+    }
+    Ok(Value::String(value.to_string()))
+}
+
+/// 清掉 24h 地区缓存（下次建引擎重新判定）。
+fn detect_region(env: &HostEnv) -> Result<(), String> {
+    let path = env.layout.cache().join("region.json");
+    if path.is_file() {
+        std::fs::remove_file(&path).map_err(|error| format!("清地区缓存失败：{error}"))?;
+    }
+    Ok(())
+}
+
+/// 设置页「重置发行版优先级」用（清空 enum_list）。
+///
+/// # Errors
+///
+/// 落盘失败时返回用户可读文案。
+pub fn clear_vendor_priority(env: &HostEnv) -> Result<(), String> {
+    let mut store = env.store();
+    store
+        .set("java.vendorPriority", Value::Array(Vec::new()))
+        .and_then(|()| store.save())
+        .map_err(|error| format!("清空发行版优先级失败：{error}"))?;
+    let _ = JdkVendor::ALL;
+    Ok(())
+}
+
+#[cfg(test)]
+#[path = "settings_tests.rs"]
+mod tests;

crates/app/src/host/settings_tests.rs

@@ -0,0 +1,77 @@
+//! host/settings.rs 的单测（拆文件守 400 行上限）。
+
+use super::*;
+
+fn env_in(dir: &std::path::Path) -> HostEnv {
+    std::fs::create_dir_all(dir.join(".ULL/config")).expect("config");
+    HostEnv::at_root(dir)
+}
+
+#[test]
+fn groups_cover_the_six_required_areas() {
+    let dir = std::env::temp_dir().join(format!("ull-host-settings-{}", std::process::id()));
+    let _ = std::fs::remove_dir_all(&dir);
+    let env = env_in(&dir);
+    let groups = groups(&env);
+    let ids: Vec<&str> = groups.iter().map(|group| group.id.as_str()).collect();
+    assert_eq!(ids, vec!["download", "java", "data", "ai", "mcp"]);
+    let keys: Vec<&str> = groups
+        .iter()
+        .flat_map(|group| group.rows.iter())
+        .map(|row| row.key.as_str())
+        .collect();
+    for key in [
+        "download.region",
+        "download.mirror_preference",
+        "java.default_memory_mb",
+        "core.data_mode",
+        "agent.mcp.enabled",
+        "agent.mcp.port",
+        "ai.base_url",
+    ] {
+        assert!(keys.contains(&key), "缺少 {key}");
+    }
+    std::fs::remove_dir_all(&dir).ok();
+}
+
+#[test]
+fn set_parses_types_and_persists() {
+    let dir = std::env::temp_dir().join(format!("ull-host-settings-w-{}", std::process::id()));
+    let _ = std::fs::remove_dir_all(&dir);
+    let env = env_in(&dir);
+
+    set(&env, "download.concurrency", "16").expect("写并发");
+    set(&env, "agent.mcp.enabled", "true").expect("写开关");
+    set(&env, "agent.mcp.port", "48000").expect("写端口");
+    set(&env, "download.region", "cn").expect("写地区");
+
+    let groups = groups(&env);
+    let row = |key: &str| {
+        groups
+            .iter()
+            .flat_map(|g| g.rows.iter())
+            .find(|r| r.key == key)
+            .cloned()
+    };
+    assert_eq!(row("download.concurrency").unwrap().selected, 2);
+    assert!(row("agent.mcp.enabled").unwrap().flag);
+    assert_eq!(row("agent.mcp.port").unwrap().value_text, "48000");
+    assert_eq!(row("download.region").unwrap().selected, 1);
+
+    assert!(set(&env, "download.concurrency", "abc").is_err());
+    assert!(set(&env, "agent.mcp.enabled", "maybe").is_err());
+    std::fs::remove_dir_all(&dir).ok();
+}
+
+#[test]
+fn detect_region_action_removes_cache() {
+    let dir = std::env::temp_dir().join(format!("ull-host-settings-r-{}", std::process::id()));
+    let _ = std::fs::remove_dir_all(&dir);
+    let env = env_in(&dir);
+    let path = env.layout.cache().join("region.json");
+    std::fs::create_dir_all(env.layout.cache()).expect("cache");
+    std::fs::write(&path, "{}").expect("写缓存");
+    set(&env, "download.action.detect_region", "").expect("检测");
+    assert!(!path.exists());
+    std::fs::remove_dir_all(&dir).ok();
+}

crates/app/src/host/versions.rs

@@ -0,0 +1,173 @@
+//! 版本清单（下载页）：远端 manifest（12h 缓存）+ 内嵌 unlisted 清单 → 分类好的行。
+//!
+//! 分类口径抄 analyse/03 §2.4：官方 `type` 决定 release/snapshot/远古；远古再按 id
+//! 前缀拆 classic（`rd-*`）/ old_alpha（`a*`）/ old_beta（`b*`），其余归 unlisted 汇总。
+//! 拉取失败但有旧缓存时用旧缓存（离线可用），全无才报错。
+
+use std::collections::BTreeSet;
+
+use unlucky_core::download::blocking::block_on;
+use unlucky_core::download::cache::now_ms;
+use unlucky_core::game::install::RemoteSource;
+use unlucky_core::game::unlisted;
+use unlucky_core::game::version::{ReleaseType, RemoteVersion};
+
+use crate::dto::{AncientKind, VersionKind, VersionSummary};
+
+use super::env::HostEnv;
+use super::job::{spawn, HostTask, JobSender};
+
+/// 版本 id / 官方类型 → 下载页的四种归类。
+pub fn kind_of(id: &str, release_type: ReleaseType) -> VersionKind {
+    match release_type {
+        ReleaseType::Release => VersionKind::Release,
+        ReleaseType::Snapshot | ReleaseType::Pending | ReleaseType::Unobfuscated => {
+            VersionKind::Snapshot
+        }
+        ReleaseType::OldAlpha | ReleaseType::OldBeta | ReleaseType::Modified => {
+            VersionKind::Ancient(ancient_kind(id))
+        }
+        ReleaseType::Unknown => {
+            if id.starts_with("rd-") || id.starts_with("a") || id.starts_with("b") {
+                VersionKind::Ancient(ancient_kind(id))
+            } else {
+                VersionKind::Release
+            }
+        }
+    }
+}
+
+/// 远古版子类（`rd-*` → classic；`a1.*` → old_alpha；`b1.*` → old_beta；其余 unlisted）。
+pub fn ancient_kind(id: &str) -> AncientKind {
+    if id.starts_with("rd-") || id.starts_with("inf-") {
+        AncientKind::Classic
+    } else if id.starts_with("a1.") || id.starts_with("a0.") || id.starts_with('a') {
+        AncientKind::OldAlpha
+    } else if id.starts_with("b1.") || id.starts_with('b') {
+        AncientKind::OldBeta
+    } else {
+        AncientKind::Unlisted
+    }
+}
+
+/// 发布日期取 `releaseTime` 的日期部分（缺失时退回 `time`，再退回空串）。
+fn released_of(version: &RemoteVersion) -> String {
+    version
+        .release_time
+        .as_deref()
+        .or(version.time.as_deref())
+        .map(|text| text.get(..10).unwrap_or(text).to_string())
+        .unwrap_or_default()
+}
+
+/// 拉清单并翻译成 DTO（安装状态按盘上版本判定）。
+fn fetch(env: &HostEnv) -> Result<Vec<VersionSummary>, String> {
+    let engine = super::engine::engine(env);
+    let meta_cache = env.layout.meta_cache();
+    let now = now_ms();
+    let (mut list, _freshness) = block_on(async {
+        RemoteSource::new(&engine, &env.game, &meta_cache, now)
+            .manifest(false)
+            .await
+    })
+    .map_err(|error| format!("拉取版本清单失败：{error}"))?;
+    // 内嵌 unlisted 清单先合（同 id 先插入者胜），保证远古版显式可达（09 §G2）。
+    unlisted::merge_into(&mut list);
+    list.sort_newest_first();
+
+    let installed: BTreeSet<String> = env
+        .game
+        .installed_versions()
+        .unwrap_or_default()
+        .into_iter()
+        .collect();
+    Ok(list
+        .versions
+        .iter()
+        .map(|version| VersionSummary {
+            id: version.id.clone(),
+            kind: kind_of(&version.id, version.version_type),
+            released: released_of(version),
+            installed: installed.contains(&version.id),
+        })
+        .collect())
+}
+
+/// 后台拉清单（网络在后台线程里，UI 不卡）。
+pub fn spawn_list(env: HostEnv, tx: JobSender) {
+    spawn("versions", move || {
+        let result = fetch(&env);
+        let _ = tx.send(HostTask::Versions(result));
+    });
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn kinds_follow_official_types() {
+        assert_eq!(
+            kind_of("1.21.9", ReleaseType::Release),
+            VersionKind::Release
+        );
+        assert_eq!(
+            kind_of("1.21.9-pre3", ReleaseType::Snapshot),
+            VersionKind::Snapshot
+        );
+        assert_eq!(
+            kind_of("rd-132211", ReleaseType::OldAlpha),
+            VersionKind::Ancient(AncientKind::Classic)
+        );
+        assert_eq!(
+            kind_of("a1.1.1", ReleaseType::OldAlpha),
+            VersionKind::Ancient(AncientKind::OldAlpha)
+        );
+        assert_eq!(
+            kind_of("b1.7.3", ReleaseType::OldBeta),
+            VersionKind::Ancient(AncientKind::OldBeta)
+        );
+        assert_eq!(
+            kind_of("x-modified", ReleaseType::Modified),
+            VersionKind::Ancient(AncientKind::Unlisted)
+        );
+    }
+
+    #[test]
+    fn released_uses_date_part() {
+        let version = RemoteVersion {
+            id: "1.20.4".to_string(),
+            version_type: ReleaseType::Release,
+            url: String::new(),
+            time: None,
+            release_time: Some("2023-12-07T12:00:00+00:00".to_string()),
+            sha1: None,
+            size: None,
+        };
+        assert_eq!(released_of(&version), "2023-12-07");
+        let empty = RemoteVersion {
+            id: "x".to_string(),
+            version_type: ReleaseType::Unknown,
+            url: String::new(),
+            time: None,
+            release_time: None,
+            sha1: None,
+            size: None,
+        };
+        assert_eq!(released_of(&empty), "");
+    }
+
+    #[test]
+    fn unlisted_merge_keeps_ancient_versions_reachable() {
+        // core 的内嵌清单里一定有远古版（`rd-*` / `a1.*` / `b1.*`）
+        let mut list = unlucky_core::game::version::VersionList::default();
+        let added = unlisted::merge_into(&mut list);
+        assert!(added > 0, "内嵌 unlisted 清单不该为空");
+        assert!(
+            list.versions.iter().any(|v| v.id.starts_with("a1.")
+                || v.id.starts_with("b1.")
+                || v.id.starts_with("rd-")),
+            "远古版必须显式可达"
+        );
+    }
+}

crates/app/src/main.rs

@@ -32,36 +32,40 @@
 #![allow(missing_docs, dead_code)]
 
 mod appearance_bind;
+mod backend;
 mod bg_image;
 mod callbacks;
+mod callbacks_pages;
 mod conv;
 mod dialogs;
 mod dto;
+mod host;
 mod mock;
 mod mock_data;
+mod page_sync;
 mod png;
 mod prefs;
 mod router;
+mod screenshot;
 mod settings_bridge;
 mod state;
 mod theme_runtime;
 mod toast;
 mod ui_bind;
+mod wizard;
 
 slint::include_modules!();
 
 fn main() -> Result<(), slint::PlatformError> {
     apply_renderer_flag();
 
-    let app = ui_bind::AppUi::new(MainWindow::new()?);
+    let app = ui_bind::AppUi::with_options(MainWindow::new()?, screenshot::app_options());
 
     // 截图验收通道（M41 视觉验收；无交互桌面/无 GPU 环境下的唯一可靠取图方式：
     // 不截屏幕，而是让 Slint 把当前场景渲染进内存像素缓冲再自己编码 PNG）。
-    if let Some(path) = screenshot_path() {
-        if std::env::args().any(|arg| arg == "--screenshot-settings") {
-            app.open_settings_appearance();
-        }
-        app.render_screenshot(&path)?;
+    // P3 追加页面选择与中间态（安装进度 / 启动事件流），见 `crate::screenshot`。
+    if let Some(options) = screenshot::shot_options() {
+        screenshot::capture(&app, &options)?;
         return Ok(());
     }
 
@@ -78,17 +82,3 @@ fn apply_renderer_flag() {
         std::env::set_var("SLINT_BACKEND", "winit-software");
     }
 }
-
-/// `--screenshot <path>` / `--screenshot=<path>`：渲染一帧并写 PNG 后退出。
-fn screenshot_path() -> Option<String> {
-    let mut args = std::env::args().skip(1);
-    while let Some(arg) = args.next() {
-        if let Some(value) = arg.strip_prefix("--screenshot=") {
-            return Some(value.to_owned());
-        }
-        if arg == "--screenshot" {
-            return args.next();
-        }
-    }
-    None
-}

crates/app/src/mock.rs

@@ -260,9 +260,9 @@ impl Backend for MockBackend {
                     crate::mock_data::mock_diagnosis(id),
                 )));
             }
-            AppCommand::RefreshInstances
-            | AppCommand::RefreshLogSessions
-            | AppCommand::StopAgent => {}
+            AppCommand::RefreshAll | AppCommand::RefreshLogSessions | AppCommand::StopAgent => {}
+            // 其余指令（安装向导/账户/Java/设置/通知）由真实 host 承接：mock 不模拟
+            _ => {}
         }
     }
 

crates/app/src/mock_data.rs

@@ -22,6 +22,9 @@ pub fn mock_instances() -> Vec<InstanceSummary> {
             last_played: Some("2026-10-29T19:22:00Z".to_string()),
             runtime: InstanceRuntime::Idle,
             icon: None,
+            isolation: "isolated".to_string(),
+            version_id: "1.20.4".to_string(),
+            version_present: true,
         },
         InstanceSummary {
             id: "vanilla-latest".to_string(),
@@ -34,6 +37,9 @@ pub fn mock_instances() -> Vec<InstanceSummary> {
             last_played: Some("2026-10-28T21:03:00Z".to_string()),
             runtime: InstanceRuntime::Idle,
             icon: None,
+            isolation: "isolated".to_string(),
+            version_id: "1.21.9".to_string(),
+            version_present: true,
         },
         InstanceSummary {
             id: "ancient-1.7.10".to_string(),
@@ -46,6 +52,9 @@ pub fn mock_instances() -> Vec<InstanceSummary> {
             last_played: None,
             runtime: InstanceRuntime::Idle,
             icon: None,
+            isolation: "shared".to_string(),
+            version_id: "1.7.10".to_string(),
+            version_present: false,
         },
         InstanceSummary {
             id: "modded-dev".to_string(),
@@ -60,6 +69,9 @@ pub fn mock_instances() -> Vec<InstanceSummary> {
                 reason: "exit0 静默失败".to_string(),
             },
             icon: None,
+            isolation: "isolated".to_string(),
+            version_id: "1.21.1-neoforge-21.1.72".to_string(),
+            version_present: true,
         },
     ]
 }

crates/app/src/page_sync.rs

@@ -0,0 +1,36 @@
+//! `PageState` global 的状态灌入（从 `ui_bind` 拆出，守 400 行上限）。
+//!
+//! 一个函数只做「AppState → Slint global 属性」的搬运，同步发生在每一拍末尾
+//! （`ui_bind::Inner::sync`）。分文件而不是砍内容：这些字段每一行都对应一个页面元素。
+
+use crate::conv;
+use crate::state::AppState;
+use crate::ui_bind::model;
+use crate::{MainWindow, PageState};
+use slint::ComponentHandle;
+
+/// 把页面状态灌进 `PageState`。
+pub(crate) fn apply(ui: &MainWindow, state: &AppState) {
+    // 导航底部账户 + PageState 全量页面状态（账户/Java/安装/设置/通知/向导）
+    ui.set_account_name(conv::active_account_name(state).into());
+    let page = ui.global::<PageState<'_>>();
+    page.set_accounts(model(conv::accounts(state)));
+    page.set_active_account(conv::active_account_name(state).into());
+    page.set_device(conv::device(state));
+    page.set_java_vendors(model(conv::java_vendors(state)));
+    page.set_java_chain(model(conv::java_chain(state)));
+    page.set_java_runtimes(model(conv::java_runtimes(state)));
+    page.set_java_order(state.java.order_text.clone().into());
+    page.set_java_region(state.java.region.clone().into());
+    page.set_java_priority_source(state.java.priority_source.clone().into());
+    page.set_java_message(state.java.message.clone().into());
+    page.set_java_busy(state.java.busy);
+    let major = state.java.majors().last().copied().unwrap_or(17);
+    page.set_java_target_major(i32::try_from(major).unwrap_or(17));
+    page.set_install(conv::install(state));
+    page.set_setting_groups(model(conv::setting_groups(state)));
+    page.set_setting_tab(state.settings_tab.clone().into());
+    page.set_notices(model(conv::notices(state)));
+    page.set_wizard(conv::wizard(state));
+    page.set_wizard_versions(model(conv::wizard_versions(state)));
+}

crates/app/src/screenshot.rs

@@ -0,0 +1,160 @@
+//! 截图验收通道的参数解析与流程（`--screenshot*` / `--data-dir` / `--mock`）。
+//!
+//! 为什么用进程内渲染而不是截屏：验收机没有交互桌面（`CopyFromScreen` 直接失败），
+//! 而 Slint 的软件渲染器能把场景渲进内存像素缓冲（`Window::take_snapshot`），
+//! 结果与屏幕上逐像素一致且不需要 GPU（M41 落地的通道，这里只加页面/中间态参数）。
+//!
+//! 中间态（安装进度 / 启动事件流）走真实后端：`--screenshot-install <版本>` 会真的发起
+//! 一次安装并停若干毫秒后取图，`--screenshot-launch <实例>` 同理。
+
+use std::path::PathBuf;
+
+use crate::backend::AppOptions;
+use crate::dto::AppCommand;
+use crate::ui_bind::AppUi;
+
+/// 一次截图请求。
+#[derive(Debug, Clone, Default)]
+pub struct ShotOptions {
+    /// 输出 PNG 路径
+    pub path: String,
+    /// 页面名（instances / download / java / logs / settings / account / appearance / agent）
+    pub page: Option<String>,
+    /// 打开新建实例向导
+    pub wizard: bool,
+    /// 发起一次真实安装并停 `dwell_ms` 后取图（中间态）
+    pub install: Option<String>,
+    /// 发起一次真实启动并停 `dwell_ms` 后取图（中间态）
+    pub launch: Option<String>,
+    /// 打开一个日志会话（日志页有数据态：日志行 + 诊断卡片）
+    pub session: Option<String>,
+    /// 中间态停留毫秒（默认 2500）
+    pub dwell_ms: u64,
+}
+
+impl ShotOptions {
+    /// 中间态默认停留时长。
+    pub const DEFAULT_DWELL_MS: u64 = 2_500;
+}
+
+/// 从命令行读启动选项（数据根 / mock）。
+pub fn app_options() -> AppOptions {
+    AppOptions {
+        data_root: value_of("--data-dir").map(PathBuf::from),
+        mock: flag("--mock"),
+    }
+}
+
+/// 从命令行读截图请求；没有 `--screenshot` 时返回 `None`。
+pub fn shot_options() -> Option<ShotOptions> {
+    let path = value_of("--screenshot")?;
+    let page = value_of("--screenshot-page");
+    let mut options = ShotOptions {
+        path,
+        page: if flag("--screenshot-settings") {
+            Some("appearance".to_string())
+        } else {
+            page
+        },
+        wizard: flag("--screenshot-wizard"),
+        install: value_of("--screenshot-install"),
+        launch: value_of("--screenshot-launch"),
+        session: value_of("--screenshot-session"),
+        dwell_ms: value_of("--screenshot-dwell")
+            .and_then(|value| value.parse().ok())
+            .unwrap_or(ShotOptions::DEFAULT_DWELL_MS),
+    };
+    if options.dwell_ms < 500 {
+        options.dwell_ms = 500;
+    }
+    options.page = options.page.filter(|page| !page.trim().is_empty());
+    Some(options)
+}
+
+/// 执行截图流程：切页 → （可选）中间态 → 渲染 PNG。
+///
+/// # Errors
+/// 窗口显示/快照/写文件失败时返回错误。
+pub fn capture(app: &AppUi, options: &ShotOptions) -> Result<(), slint::PlatformError> {
+    if let Some(page) = &options.page {
+        app.open_page(page);
+        // 先给后端一次全量刷新：版本清单要在后台线程里拉（12h 缓存），
+        // 下载页/Java 页/向导需要它才有「有数据态」。
+        let warmup = if matches!(page.as_str(), "download" | "java") {
+            4_000
+        } else {
+            1_200
+        };
+        app.dispatch_and_run(AppCommand::RefreshAll, warmup);
+    }
+    if options.wizard {
+        app.open_wizard();
+    }
+    if let Some(version) = &options.install {
+        app.dispatch_and_run(
+            AppCommand::InstallVersion(version.clone()),
+            options.dwell_ms,
+        );
+    }
+    if let Some(session) = &options.session {
+        app.open_session(session);
+        app.dispatch_and_run(AppCommand::RefreshLogSessions, options.dwell_ms.min(1_000));
+    }
+    if let Some(instance) = &options.launch {
+        app.dispatch_and_run(
+            AppCommand::LaunchInstance(instance.clone()),
+            options.dwell_ms,
+        );
+    }
+    app.render_screenshot(&options.path)?;
+    // 启动中间态截完就把进程收掉：截图进程退出后子进程会变孤儿，
+    // 所以在取图之后显式 stop（kill_tree），不留给系统。
+    if let Some(instance) = &options.launch {
+        app.dispatch_and_run(AppCommand::StopInstance(instance.clone()), 1_500);
+    }
+    Ok(())
+}
+
+/// `--flag` 是否存在。
+pub fn flag(name: &str) -> bool {
+    std::env::args().skip(1).any(|arg| arg == name)
+}
+
+/// `--key value` / `--key=value` 的取值。
+pub fn value_of(name: &str) -> Option<String> {
+    let mut args = std::env::args().skip(1);
+    while let Some(arg) = args.next() {
+        if let Some(value) = arg.strip_prefix(&format!("{name}=")) {
+            return Some(value.to_string());
+        }
+        if arg == name {
+            return args.next();
+        }
+    }
+    None
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn default_dwell_is_a_visible_mid_state() {
+        const DEFAULT: u64 = ShotOptions::DEFAULT_DWELL_MS;
+        let dwell = DEFAULT;
+        assert!(dwell >= 1_000, "中间态至少要停 1 秒才看得见进度");
+    }
+
+    #[test]
+    fn options_without_screenshot_are_none() {
+        // 测试进程没有 --screenshot 参数
+        assert!(
+            shot_options().is_none() || std::env::args().any(|arg| arg.contains("--screenshot"))
+        );
+    }
+
+    #[test]
+    fn value_of_ignores_absent_flags() {
+        assert!(value_of("--definitely-not-a-real-flag").is_none());
+    }
+}

crates/app/src/state.rs

@@ -5,12 +5,14 @@
 
 use crate::dialogs::DialogQueue;
 use crate::dto::{
-    AgentEvent, AppEvent, ChatMessage, ChatRole, CoreEvent, DiagnosisReport, InstanceRuntime,
-    InstanceSummary, LogLine, LogSession, Progress, ToolCallView, VersionSummary,
+    AccountView, AgentEvent, AppEvent, ChatMessage, ChatRole, CoreEvent, DeviceLoginView,
+    DiagnosisReport, InstallProgressView, InstanceRuntime, InstanceSummary, JavaPageView, LogLine,
+    LogSession, NoticeView, Progress, SettingGroupView, ToolCallView, VersionSummary,
 };
 use crate::prefs::UiPrefs;
 use crate::router::{AiPanelMode, Route, Router};
-use crate::toast::ToastCenter;
+use crate::toast::{ToastCenter, ToastKind};
+use crate::wizard::WizardState;
 
 /// AI 会话状态（右侧栏与独立页共享同一份，切换不丢）。
 #[derive(Debug, Clone, PartialEq, Eq)]
@@ -75,6 +77,9 @@ pub fn grid_positions(count: usize, columns: usize) -> Vec<(usize, usize)> {
         .collect()
 }
 
+/// 实时日志最多保留的行数（滚动窗口；更多行由日志页的筛选/历史会话承担）。
+pub const MAX_LIVE_LINES: usize = 2_000;
+
 /// 应用全局状态。
 #[derive(Debug)]
 pub struct AppState {
@@ -106,6 +111,24 @@ pub struct AppState {
     pub installed_only: bool,
     /// 下载页版本号筛选词
     pub download_query: String,
+    /// 账户列表（三轨统一视图；凭据不在其中）
+    pub accounts: Vec<AccountView>,
+    /// 微软设备码登录状态
+    pub device_login: DeviceLoginView,
+    /// Java 页快照（发行版 / 回退链 / 运行时）
+    pub java: JavaPageView,
+    /// 安装进度（None = 没有安装任务）
+    pub install: Option<InstallProgressView>,
+    /// 设置分组（设置页右栏）
+    pub settings_groups: Vec<SettingGroupView>,
+    /// 当前选中的设置分组（download / java / data / ai / mcp）
+    pub settings_tab: String,
+    /// 横幅通知
+    pub notices: Vec<NoticeView>,
+    /// 新建实例向导
+    pub wizard: WizardState,
+    /// 正在实时尾随的会话
+    pub live_session: Option<String>,
 }
 
 impl Default for AppState {
@@ -132,6 +155,15 @@ impl AppState {
             instance_query: String::new(),
             installed_only: false,
             download_query: String::new(),
+            accounts: Vec::new(),
+            device_login: DeviceLoginView::new(),
+            java: JavaPageView::new(),
+            install: None,
+            settings_groups: Vec::new(),
+            settings_tab: "download".to_string(),
+            notices: Vec::new(),
+            wizard: WizardState::new(),
+            live_session: None,
         }
     }
 
@@ -186,12 +218,51 @@ impl AppState {
             }
             CoreEvent::VersionListChanged(versions) => self.versions = versions,
             CoreEvent::LogSessionsChanged(sessions) => self.log_sessions = sessions,
-            CoreEvent::LogLinesChanged(lines) => self.log_lines = lines,
+            CoreEvent::LogLinesChanged(lines) => {
+                self.log_lines = lines;
+                self.live_session = None;
+            }
+            CoreEvent::LogAppended(batch) => self.append_live_lines(&batch),
+            CoreEvent::LaunchFinished(finished) => {
+                self.live_session = None;
+                self.selected_session = Some(finished.session.clone());
+                let kind = if finished.outcome == crate::dto::LogOutcome::Ok {
+                    ToastKind::Success
+                } else {
+                    ToastKind::Error
+                };
+                self.toasts.push(kind, finished.summary);
+            }
             CoreEvent::DiagnosisReady(report) => self.diagnosis = Some(report),
+            CoreEvent::AccountsChanged(accounts) => self.accounts = accounts,
+            CoreEvent::DeviceLoginChanged(view) => {
+                if view.phase == crate::dto::DeviceLoginPhase::Succeeded {
+                    self.toasts
+                        .push(ToastKind::Success, format!("已登录：{}", view.account_name));
+                }
+                if view.phase == crate::dto::DeviceLoginPhase::Failed {
+                    self.toasts.push(ToastKind::Error, view.message.clone());
+                }
+                self.device_login = view;
+            }
+            CoreEvent::JavaChanged(page) => self.java = page,
+            CoreEvent::InstallProgress(progress) => match progress {
+                Some(progress) => {
+                    let terminal = progress.stage.is_terminal();
+                    self.install = Some(progress);
+                    if terminal {
+                        self.wizard.open = false;
+                        self.wizard.submitting = false;
+                    }
+                }
+                None => self.install = None,
+            },
+            CoreEvent::SettingsChanged(groups) => self.settings_groups = groups,
+            CoreEvent::NoticesChanged(notices) => self.notices = notices,
         }
     }
 
-    /// agent 事件。
+    /// agent 事件（AI 会话的流式消息与工具调用）。
     pub fn apply_agent(&mut self, event: AgentEvent) {
         match event {
             AgentEvent::MessageAppended(message) => {
@@ -242,6 +313,25 @@ impl AppState {
         }
     }
 
+    /// 实时日志增量：只追加，封顶 [`MAX_LIVE_LINES`] 行（滚动窗口）。
+    fn append_live_lines(&mut self, batch: &crate::dto::LiveLogBatch) {
+        if self
+            .live_session
+            .as_deref()
+            .is_some_and(|session| session != batch.session)
+        {
+            // 换了一个会话在跑：清掉上一场的行，避免两场日志混在一起
+            self.log_lines.clear();
+        }
+        self.live_session = batch.running.then(|| batch.session.clone());
+        self.selected_session = Some(batch.session.clone());
+        self.log_lines.extend(batch.lines.iter().cloned());
+        if self.log_lines.len() > MAX_LIVE_LINES {
+            let drop = self.log_lines.len() - MAX_LIVE_LINES;
+            self.log_lines.drain(..drop);
+        }
+    }
+
     /// 按搜索词过滤后的磁贴网格（顺序稳定 = 实例列表顺序）。
     pub fn tiles(&self) -> Vec<TileCell<'_>> {
         let query = self.instance_query.trim().to_lowercase();

crates/app/src/state_tests.rs

@@ -23,6 +23,9 @@ fn instance(id: &str, name: &str) -> InstanceSummary {
         last_played: None,
         runtime: InstanceRuntime::Idle,
         icon: None,
+        isolation: "isolated".to_string(),
+        version_id: "1.20.4".to_string(),
+        version_present: true,
     }
 }
 

crates/app/src/toast.rs

@@ -3,11 +3,13 @@
 //! 与模态对话框队列（[`crate::dialogs`]）分开：Toast 不阻塞、不排序、可叠加，
 //! 只做「先进先出 + 上限裁剪 + TTL 到期」。UI 侧由 Rust 定时器每帧调用 [`ToastCenter::expire`]。
 
+use serde::{Deserialize, Serialize};
+
 /// Toast 标识。
 pub type ToastId = u64;
 
 /// Toast 语义色。
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ToastKind {
     /// 一般信息
     Info,
@@ -20,7 +22,7 @@ pub enum ToastKind {
 }
 
 /// 一条 Toast；`remaining_ms` 由 [`ToastCenter::expire`] 递减。
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct Toast {
     /// 队列内唯一 id（由 [`ToastCenter::push_request`] 重新编号）
     pub id: ToastId,

crates/app/src/ui_bind.rs

@@ -14,14 +14,14 @@ use std::time::Duration;
 
 use slint::{ComponentHandle, ModelRc, VecModel};
 
+use crate::backend::{build_backend, config_path, AppOptions};
 use crate::bg_image::BackgroundLayers;
 use crate::conv;
-use crate::dto::{AppCommand, Backend, InstanceId};
-use crate::mock::MockBackend;
+use crate::dto::{AppCommand, Backend};
 use crate::prefs::BgFill;
 use crate::settings_bridge::SettingsBridge;
 use crate::state::AppState;
-use crate::{MainWindow, SettingSection};
+use crate::{MainWindow, PageState, SettingSection};
 
 /// 定时器节拍：33ms ≈ 30fps（磁贴进度环 / 流式文本 / Toast TTL 的刷新下限）。
 const TICK_MS: u64 = 33;
@@ -67,19 +67,28 @@ pub(crate) struct BackgroundKey {
 }
 
 impl AppUi {
-    /// 建状态 + 假后端、读配置、接全部回调、灌初始事件并做第一次同步。
+    /// 建状态 + 真实后端、读配置、接全部回调、灌初始事件并做第一次同步。
     pub fn new(ui: MainWindow) -> Self {
+        Self::with_options(ui, AppOptions::default())
+    }
+
+    /// 带启动选项装配（数据根覆盖 / 强制 mock）。
+    pub fn with_options(ui: MainWindow, options: AppOptions) -> Self {
         // 先读一次落盘配置：主题三态 + 外观四件必须在首帧前就位（否则会闪一下出厂外观）
-        let bridge = SettingsBridge::open();
+        let bridge = match &options.data_root {
+            Some(root) => SettingsBridge::with_path(config_path(root)),
+            None => SettingsBridge::open(),
+        };
         let (appearance, theme) = bridge.load();
         let mut state = AppState::new();
         state.prefs.appearance = appearance;
         state.prefs.theme = theme;
 
+        let backend = build_backend(&options);
         let inner = Rc::new(Inner {
             ui,
             state: RefCell::new(state),
-            backend: RefCell::new(Box::new(MockBackend::new())),
+            backend: RefCell::new(backend),
             bridge: RefCell::new(bridge),
             background: RefCell::new(BackgroundLayers::default()),
             background_key: RefCell::new(None),
@@ -88,6 +97,7 @@ impl AppUi {
         });
 
         crate::callbacks::wire(Rc::downgrade(&inner));
+        crate::callbacks_pages::wire_pages(Rc::downgrade(&inner));
         inner.drain_events();
         inner.align_system_theme();
         inner.apply_theme();
@@ -134,6 +144,71 @@ impl AppUi {
         slint::platform::update_timers_and_animations();
     }
 
+    /// 直接跳到一个页面（截图验收用：每页一张）。
+    pub fn open_page(&self, page: &str) {
+        let route = match page {
+            "download" | "java" => crate::router::Route::Download,
+            "logs" => crate::router::Route::Logs,
+            "settings" | "account" | "appearance" => crate::router::Route::Settings,
+            "agent" => crate::router::Route::Agent,
+            _ => crate::router::Route::Instances,
+        };
+        {
+            let mut state = self.inner.state.borrow_mut();
+            state.navigate(route);
+            match page {
+                "account" => state.settings_tab = "account".to_string(),
+                "java" => state.settings_tab = "java".to_string(),
+                "settings" => state.settings_tab = "download".to_string(),
+                _ => {}
+            }
+            let download_tab = i32::from(page == "java");
+            self.inner
+                .ui
+                .global::<PageState<'_>>()
+                .set_download_tab(download_tab);
+        }
+        match page {
+            "account" => self.inner.ui.set_settings_section(SettingSection::Account),
+            "java" => self.inner.ui.set_settings_section(SettingSection::Java),
+            "appearance" => self
+                .inner
+                .ui
+                .set_settings_section(SettingSection::Appearance),
+            "settings" => self.inner.ui.set_settings_section(SettingSection::Download),
+            _ => {}
+        }
+        self.inner.sync();
+        slint::platform::update_timers_and_animations();
+    }
+
+    /// 打开新建实例向导（截图验收用）。
+    pub fn open_wizard(&self) {
+        self.inner.state.borrow_mut().wizard = crate::wizard::WizardState::open();
+        self.inner.sync();
+        slint::platform::update_timers_and_animations();
+    }
+
+    /// 打开一个日志会话（截图验收：日志行 + 诊断卡片 + 头部标题都要有值）。
+    pub fn open_session(&self, id: &str) {
+        self.inner.state.borrow_mut().selected_session = Some(id.to_string());
+        self.inner
+            .dispatch(AppCommand::OpenLogSession(id.to_string()));
+        self.inner.sync();
+        slint::platform::update_timers_and_animations();
+    }
+
+    /// 派发一条指令并跑若干毫秒（截图中间态：安装进度 / 启动事件流）。
+    pub fn dispatch_and_run(&self, command: AppCommand, millis: u64) {
+        self.inner.dispatch(command);
+        let steps = (millis / TICK_MS).max(1);
+        for _ in 0..steps {
+            self.inner.tick();
+            slint::platform::update_timers_and_animations();
+            std::thread::sleep(Duration::from_millis(TICK_MS));
+        }
+    }
+
     /// 渲染当前场景并存成 PNG（`--screenshot` 通道；见 `crate::png`）。
     ///
     /// 为什么要这条通道：验收环境可能没有交互桌面（`CopyFromScreen` 直接失败），
@@ -150,8 +225,8 @@ impl AppUi {
             .set_size(slint::WindowSize::Logical(slint::LogicalSize::new(
                 1180.0, 760.0,
             )));
-        // 先走几拍：把 mock 事件（实例/版本/日志）与 33ms 节拍的效果灌进去
-        for _ in 0..4 {
+        // 先走几拍：把后端事件（实例/版本/日志/账户/设置）与 33ms 节拍的效果灌进去
+        for _ in 0..8 {
             self.tick_once();
             std::thread::sleep(Duration::from_millis(TICK_MS));
         }
@@ -245,89 +320,13 @@ impl Inner {
         ui.set_dialog(dialog);
         ui.set_dialog_open(open);
         ui.set_dialog_queued(queued);
+
+        // PageState（账户/Java/安装/设置/通知/向导）在独立模块里灌，守 400 行
+        crate::page_sync::apply(ui, &state);
     }
 }
 
+/// Slint 列表模型（VecModel → ModelRc）。
 pub(crate) fn model<T: Clone + 'static>(items: Vec<T>) -> ModelRc<T> {
     ModelRc::new(VecModel::from(items))
 }
-
-/// 停止实例的指令构造（阶段 C 的磁贴「停止」键用；P0 只保留 API）。
-#[allow(dead_code)]
-pub fn stop_instance(id: &InstanceId) -> AppCommand {
-    AppCommand::StopInstance(id.clone())
-}
-
-#[cfg(test)]
-mod tests {
-    use std::time::Duration;
-
-    use super::send_agent_message;
-    use crate::dto::{Backend, ChatRole};
-    use crate::mock::MockBackend;
-    use crate::state::AppState;
-
-    /// 集成测试（callbacks→state→mock 全链路）：发一次提问后
-    /// ①用户消息恰出现一次（无本地回显重复）②所有 assistant 气泡收敛（无幽灵气泡）。
-    ///
-    /// 分层单测漏掉这条正是 review P1-1 的根因，故这里用真实 mock 后端跑完整事件流。
-    #[test]
-    fn send_path_has_no_duplicate_user_message_and_no_ghost_stream() {
-        let mut state = AppState::new();
-        let mut backend = MockBackend::new();
-        // 先灌入种子事件（实例/版本/日志快照）
-        for event in backend.drain_events() {
-            state.apply(event);
-        }
-
-        send_agent_message(&mut state, &mut backend, "装哪个版本");
-
-        fn user_count(state: &AppState) -> usize {
-            state
-                .ai
-                .messages
-                .iter()
-                .filter(|message| message.role == ChatRole::User)
-                .count()
-        }
-        assert_eq!(
-            user_count(&state),
-            1,
-            "用户消息必须恰好一条（本地回显会造成两条）"
-        );
-        assert!(state.ai.streaming);
-
-        // 推进到流式收敛（mock 300ms/片 + 工具调用 + 收尾消息）
-        for _ in 0..12 {
-            backend.tick(Duration::from_millis(400));
-            for event in backend.drain_events() {
-                state.apply(event);
-            }
-        }
-
-        assert_eq!(user_count(&state), 1, "事件回流后用户消息仍应只有一条");
-        assert!(
-            state.ai.messages.iter().all(|message| !message.streaming),
-            "所有气泡必须收敛（幽灵气泡会永久 streaming）"
-        );
-        assert!(!state.ai.streaming);
-        assert!(
-            state
-                .ai
-                .messages
-                .iter()
-                .any(|message| message.role == ChatRole::Assistant && !message.text.is_empty()),
-            "增量应累积到 assistant 正文"
-        );
-        assert_eq!(
-            state
-                .ai
-                .messages
-                .iter()
-                .filter(|message| message.role == ChatRole::Assistant)
-                .count(),
-            2,
-            "一轮对话 = 流式回复 + 收尾回复"
-        );
-    }
-}

crates/app/src/wizard.rs

@@ -0,0 +1,275 @@
+//! 新建实例向导（09 §G5）的纯状态机：版本 → 加载器 → 实例名 → 确认 → 进度。
+//!
+//! 放纯 Rust 而不是 Slint 里：步骤推进、名字合法性、加载器约束都能单测，
+//! Slint 只负责画。提交时由 host 转成 [`crate::dto::CreateRequest`] 走安装管线。
+
+use crate::dto::LoaderKind;
+
+/// 向导步骤。
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+pub enum WizardStep {
+    /// 选版本
+    #[default]
+    Version,
+    /// 选加载器
+    Loader,
+    /// 起名
+    Name,
+    /// 确认（显示将下载的项）
+    Confirm,
+    /// 进度（提交后由安装进度接管）
+    Progress,
+}
+
+impl WizardStep {
+    /// 步骤序号（0 起，用于「第 N 步」文案）。
+    pub fn index(self) -> usize {
+        match self {
+            Self::Version => 0,
+            Self::Loader => 1,
+            Self::Name => 2,
+            Self::Confirm => 3,
+            Self::Progress => 4,
+        }
+    }
+
+    /// 步骤标题。
+    pub fn title(self) -> &'static str {
+        match self {
+            Self::Version => "选择版本",
+            Self::Loader => "选择加载器",
+            Self::Name => "实例名",
+            Self::Confirm => "确认",
+            Self::Progress => "安装中",
+        }
+    }
+
+    /// 下一步（进度是终点）。
+    pub fn next(self) -> Self {
+        match self {
+            Self::Version | Self::Progress => {
+                if self == Self::Progress {
+                    Self::Progress
+                } else {
+                    Self::Loader
+                }
+            }
+            Self::Loader => Self::Name,
+            Self::Name => Self::Confirm,
+            Self::Confirm => Self::Progress,
+        }
+    }
+
+    /// 上一步（版本是起点）。
+    pub fn back(self) -> Self {
+        match self {
+            Self::Version | Self::Progress => Self::Version,
+            Self::Loader => Self::Version,
+            Self::Name => Self::Loader,
+            Self::Confirm => Self::Name,
+        }
+    }
+}
+
+/// 向导状态。
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct WizardState {
+    /// 是否打开（全屏模态）
+    pub open: bool,
+    /// 当前步骤
+    pub step: WizardStep,
+    /// 选中的版本 id
+    pub version: String,
+    /// 选中的加载器
+    pub loader: LoaderKind,
+    /// 加载器版本（空 = 最新）
+    pub loader_version: String,
+    /// 实例名草稿
+    pub name: String,
+    /// 校验错误（显示在向导内，不弹 Toast）
+    pub error: String,
+    /// 已提交（防重复点）
+    pub submitting: bool,
+}
+
+impl Default for WizardState {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl WizardState {
+    /// 关闭态。
+    pub fn new() -> Self {
+        Self {
+            open: false,
+            step: WizardStep::Version,
+            version: String::new(),
+            loader: LoaderKind::Vanilla,
+            loader_version: String::new(),
+            name: String::new(),
+            error: String::new(),
+            submitting: false,
+        }
+    }
+
+    /// 打开向导并复位。
+    pub fn open() -> Self {
+        Self {
+            open: true,
+            ..Self::new()
+        }
+    }
+
+    /// 选了版本：自动把实例名填成版本号（用户不改就用它）。
+    pub fn select_version(&mut self, version: &str) {
+        self.version = version.to_string();
+        if self.name.trim().is_empty() {
+            self.name = version.to_string();
+        }
+        self.error.clear();
+    }
+
+    /// 选加载器（原版会清掉加载器版本）。
+    pub fn select_loader(&mut self, loader: LoaderKind) {
+        self.loader = loader;
+        if loader == LoaderKind::Vanilla {
+            self.loader_version.clear();
+        }
+        self.error.clear();
+    }
+
+    /// 推进到下一步；校验不通过时留在原地并写 `error`。
+    pub fn advance(&mut self) -> bool {
+        match self.step {
+            WizardStep::Version => {
+                if self.version.trim().is_empty() {
+                    self.error = "请先选择一个版本".to_string();
+                    return false;
+                }
+            }
+            WizardStep::Name => {
+                if let Err(error) = validate_name(&self.name) {
+                    self.error = error;
+                    return false;
+                }
+            }
+            WizardStep::Loader | WizardStep::Confirm | WizardStep::Progress => {}
+        }
+        self.error.clear();
+        self.step = self.step.next();
+        true
+    }
+
+    /// 回退一步。
+    pub fn step_back(&mut self) {
+        self.error.clear();
+        self.step = self.step.back();
+    }
+
+    /// 提交前的最后校验（Confirm 步）。
+    pub fn ready_to_submit(&self) -> Result<(), String> {
+        if self.version.trim().is_empty() {
+            return Err("版本为空".to_string());
+        }
+        validate_name(&self.name)?;
+        Ok(())
+    }
+
+    /// 提交成功后进入进度步（关掉可编辑态）。
+    pub fn submitted(&mut self) {
+        self.submitting = true;
+        self.step = WizardStep::Progress;
+        self.error.clear();
+    }
+}
+
+/// 实例名合法性（不能空、不能含路径分隔符/控制字符、长度上限 64）。
+pub fn validate_name(name: &str) -> Result<(), String> {
+    let trimmed = name.trim();
+    if trimmed.is_empty() {
+        return Err("实例名不能为空".to_string());
+    }
+    if trimmed.chars().count() > 64 {
+        return Err("实例名最多 64 个字符".to_string());
+    }
+    if trimmed.contains(['/', '\\', ':', '*', '?', '"', '<', '>', '|']) {
+        return Err("实例名不能包含 / \\ : * ? \" < > |".to_string());
+    }
+    if trimmed.chars().any(|ch| ch.is_control()) {
+        return Err("实例名不能包含控制字符".to_string());
+    }
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn steps_walk_forward_and_back() {
+        assert_eq!(WizardStep::Version.next(), WizardStep::Loader);
+        assert_eq!(WizardStep::Loader.next(), WizardStep::Name);
+        assert_eq!(WizardStep::Name.next(), WizardStep::Confirm);
+        assert_eq!(WizardStep::Confirm.next(), WizardStep::Progress);
+        assert_eq!(WizardStep::Progress.next(), WizardStep::Progress);
+        assert_eq!(WizardStep::Confirm.back(), WizardStep::Name);
+        assert_eq!(WizardStep::Version.back(), WizardStep::Version);
+        assert_eq!(WizardStep::Progress.index(), 4);
+    }
+
+    #[test]
+    fn version_selection_fills_name_but_does_not_overwrite() {
+        let mut wizard = WizardState::open();
+        assert!(wizard.open);
+        wizard.select_version("1.20.4");
+        assert_eq!(wizard.name, "1.20.4");
+        wizard.name = "生存".to_string();
+        wizard.select_version("1.21");
+        assert_eq!(wizard.name, "生存", "用户改过的名字不该被覆盖");
+    }
+
+    #[test]
+    fn advance_requires_a_version_and_a_valid_name() {
+        let mut wizard = WizardState::open();
+        assert!(!wizard.advance(), "没有版本不能进下一步");
+        assert_eq!(wizard.error, "请先选择一个版本");
+
+        wizard.select_version("1.20.4");
+        assert!(wizard.advance());
+        assert_eq!(wizard.step, WizardStep::Loader);
+        assert!(wizard.advance());
+        assert_eq!(wizard.step, WizardStep::Name);
+
+        wizard.name = "a/b".to_string();
+        assert!(!wizard.advance(), "非法名字不能确认");
+        assert!(wizard.error.contains("不能包含"));
+
+        wizard.name = "生存".to_string();
+        assert!(wizard.advance());
+        assert_eq!(wizard.step, WizardStep::Confirm);
+        assert!(wizard.ready_to_submit().is_ok());
+        wizard.submitted();
+        assert_eq!(wizard.step, WizardStep::Progress);
+        assert!(wizard.submitting);
+    }
+
+    #[test]
+    fn loader_selection_clears_loader_version_for_vanilla() {
+        let mut wizard = WizardState::open();
+        wizard.loader_version = "0.16.5".to_string();
+        wizard.select_loader(LoaderKind::Fabric);
+        assert_eq!(wizard.loader_version, "0.16.5");
+        wizard.select_loader(LoaderKind::Vanilla);
+        assert_eq!(wizard.loader, LoaderKind::Vanilla);
+        assert!(wizard.loader_version.is_empty());
+    }
+
+    #[test]
+    fn name_validation_rejects_long_and_control_input() {
+        assert!(validate_name("生存").is_ok());
+        assert!(validate_name("").is_err());
+        assert!(validate_name(&"x".repeat(65)).is_err());
+        assert!(validate_name("a\u{7}b").is_err());
+    }
+}

crates/app/ui/components/install-panel.slint

@@ -0,0 +1,73 @@
+// 安装进度卡片（下载页底部 / 向导进度步共用）：阶段 + 进度条 + 文件/字节/速度/剩余 + 取消。
+import { Theme } from "../theme/tokens.slint";
+import { Metrics } from "../theme/metrics.slint";
+import { UiInstallProgress, InstallStage } from "../models.slint";
+import { UiText, TextRole } from "../components/label.slint";
+import { ProgressBar } from "../components/progress-bar.slint";
+import { AppIcon, IconKind } from "../components/icons.slint";
+import { MetroButton, ButtonKind } from "../widgets/button.slint";
+
+export component InstallPanel inherits Rectangle {
+    in property <UiInstallProgress> data;
+    callback cancel();
+
+    height: 96px;
+    visible: root.data.visible;
+    background: Theme.bg-surface;
+    border-width: 1px;
+    border-color: Theme.stroke;
+
+    VerticalLayout {
+        padding: Metrics.gap-3;
+        spacing: Metrics.gap-1;
+
+        HorizontalLayout {
+            spacing: Metrics.gap-2;
+
+            AppIcon {
+                icon-size: 16px;
+                kind: root.data.failed ? IconKind.error
+                    : root.data.terminal ? IconKind.check
+                    : IconKind.download;
+                tint: root.data.failed ? Theme.state-danger
+                    : root.data.terminal ? Theme.state-success
+                    : Theme.accent;
+            }
+            UiText {
+                role: TextRole.bodyStrong;
+                text: root.data.instance + " · " + root.data.loader;
+                horizontal-stretch: 1;
+            }
+            UiText {
+                role: TextRole.caption;
+                text: root.data.stage_label;
+                color: root.data.failed ? Theme.state-danger : Theme.fg-secondary;
+            }
+            if !root.data.terminal : MetroButton {
+                kind: ButtonKind.subtle;
+                text: "取消";
+                button-height: 24px;
+                clicked => { root.cancel(); }
+            }
+        }
+
+        ProgressBar {
+            ratio: root.data.ratio;
+            known: root.data.known;
+        }
+
+        HorizontalLayout {
+            spacing: Metrics.gap-3;
+            UiText {
+                role: TextRole.caption;
+                text: root.data.message;
+                horizontal-stretch: 1;
+                overflow: elide;
+            }
+            UiText { role: TextRole.caption; text: root.data.files_label; }
+            UiText { role: TextRole.caption; text: root.data.bytes_label; }
+            UiText { role: TextRole.caption; text: root.data.speed; color: Theme.accent; }
+            UiText { role: TextRole.caption; text: root.data.eta; }
+        }
+    }
+}

crates/app/ui/components/notice-bar.slint

@@ -0,0 +1,57 @@
+// 横幅通知条：隔离档位切换提示（M30 ModeChangeWarning）/ 启动失败 / 启动告警。
+// 与 Toast 的分工：Toast 是「刚发生了什么」，通知条是「现在需要你处理」（用户点了才收）。
+import { Theme } from "../theme/tokens.slint";
+import { Metrics } from "../theme/metrics.slint";
+import { UiNotice, NoticeKind } from "../models.slint";
+import { PageState } from "../page_state.slint";
+import { UiText, TextRole } from "../components/label.slint";
+import { AppIcon, IconKind } from "../components/icons.slint";
+import { MetroButton, ButtonKind } from "../widgets/button.slint";
+
+// 横幅通知：隔离档位切换提示（M30 ModeChangeWarning）/ 启动失败 / 启动告警。
+// 与 Toast 的分工：Toast 是「刚发生了什么」，通知条是「现在需要你处理」。
+export component NoticeBar inherits Rectangle {
+    in property <[UiNotice]> notices;
+
+    visible: root.notices.length > 0;
+    height: root.notices.length > 0 ? 48px : 0px;
+    background: Theme.state-warn-soft;
+
+    HorizontalLayout {
+        padding-left: Metrics.gap-4;
+        padding-right: Metrics.gap-3;
+        spacing: Metrics.gap-2;
+
+        for notice in root.notices : Rectangle {
+            horizontal-stretch: 1;
+            background: transparent;
+            HorizontalLayout {
+                spacing: Metrics.gap-2;
+                AppIcon {
+                    icon-size: 16px;
+                    kind: notice.kind == NoticeKind.error ? IconKind.error : IconKind.warn;
+                    tint: notice.kind == NoticeKind.error ? Theme.state-danger : Theme.state-warn;
+                }
+                VerticalLayout {
+                    vertical-stretch: 1;
+                    spacing: 0px;
+                    UiText { role: TextRole.caption; text: notice.title; horizontal-stretch: 1; }
+                    UiText {
+                        role: TextRole.caption;
+                        text: notice.body;
+                        horizontal-stretch: 1;
+                        overflow: elide;
+                        color: Theme.fg-secondary;
+                    }
+                }
+                MetroButton {
+                    kind: ButtonKind.subtle;
+                    text: "知道了";
+                    button-height: 22px;
+                    clicked => { PageState.notice-dismiss(notice.id); }
+                }
+            }
+        }
+    }
+}
+

crates/app/ui/components/progress-bar.slint

@@ -0,0 +1,34 @@
+// 细进度条（0.0~1.0）：安装进度 / 下载页顶部 / 向导进度共用。
+// 未知总量（known = false）时画一条不确定态的弱色轨道，而不是假装 0%。
+import { Theme } from "../theme/tokens.slint";
+import { Metrics } from "../theme/metrics.slint";
+
+export component ProgressBar inherits Rectangle {
+    in property <float> ratio: 0.0;
+    in property <bool> known: true;
+    in property <length> bar-height: 6px;
+
+    height: root.bar-height;
+    border-radius: root.bar-height / 2;
+    background: Theme.bg-hover;
+    clip: true;
+
+    Rectangle {
+        x: 0;
+        y: 0;
+        width: root.known ? max(0px, root.width * clamp(root.ratio, 0.0, 1.0)) : 0px;
+        height: root.height;
+        border-radius: root.bar-height / 2;
+        background: Theme.accent;
+        animate width { duration: 180ms; easing: ease-out; }
+    }
+
+    if !root.known : Rectangle {
+        x: 0;
+        y: 0;
+        width: root.width / 3;
+        height: root.height;
+        border-radius: root.bar-height / 2;
+        background: Theme.accent-soft;
+    }
+}

crates/app/ui/main.slint

@@ -9,6 +9,8 @@
 // 亮/暗双套色板（LightPalette/DarkPalette）、主题三态解析、排版 ramp 与字体栈；M11 的占位
 // NavItem/Tile 组件由 `components/nav.slint` 与 `components/tile.slint` 取代，占位内核不再保留。
 
+// P3：页面状态 global 从根文件再导出一遍，Rust 侧才能拿到 `PageState` 类型。
+export { PageState } from "page_state.slint";
 import { AppShell } from "shell.slint";
 import { Theme } from "theme/tokens.slint";
 import { Metrics } from "theme/metrics.slint";

crates/app/ui/models.slint

@@ -216,3 +216,149 @@ export struct UiToast {
     kind: ToastKind,
     text: string,
 }
+
+// ── P3 全量接线的视图模型（账户 / Java / 安装 / 设置分组 / 通知 / 向导）──────────
+// 这些类型由 Rust 的 dto 单向转换（`conv/pages.rs`），Slint 只读不写业务真相。
+// 全部经 `page_state.slint` 的 `PageState` global 下发（避免 main/shell 的属性转发膨胀）。
+
+export enum AccountKind {
+    offline,
+    microsoft,
+    authlib,
+}
+
+export struct UiAccount {
+    id: string,
+    name: string,
+    kind: AccountKind,
+    kind_label: string,
+    profile_id: string,
+    login_name: string,
+    created: string,
+    active: bool,
+}
+
+/// 设备码登录面板（用户码/链接不是凭据，可直接展示）。
+export struct UiDeviceCode {
+    visible: bool,
+    busy: bool,
+    user_code: string,
+    verification_uri: string,
+    qr_link: string,
+    expires: int,
+    message: string,
+    phase_label: string,
+}
+
+export enum JavaStepOutcome {
+    pending,
+    skip,
+    failed,
+    hit,
+}
+
+export struct UiJavaStep {
+    vendor: string,
+    outcome: JavaStepOutcome,
+    outcome_label: string,
+    detail: string,
+}
+
+export struct UiJavaVendor {
+    id: string,
+    display: string,
+    rank: int,
+    majors: string,
+    sources: string,
+    installed: bool,
+}
+
+export struct UiJavaRuntime {
+    binary: string,
+    version: string,
+    vendor: string,
+    origin: string,
+}
+
+export enum InstallStage {
+    planning,
+    downloading,
+    installing,
+    registering,
+    done,
+    failed,
+    cancelled,
+}
+
+export struct UiInstallProgress {
+    visible: bool,
+    version: string,
+    instance: string,
+    loader: string,
+    stage: InstallStage,
+    stage_label: string,
+    ratio: float,
+    known: bool,
+    files_label: string,
+    bytes_label: string,
+    speed: string,
+    eta: string,
+    message: string,
+    terminal: bool,
+    failed: bool,
+}
+
+export enum SettingControl {
+    toggle,
+    choice,
+    text,
+    readonly,
+    action,
+}
+
+export struct UiSettingRow {
+    key: string,
+    label: string,
+    description: string,
+    control: SettingControl,
+    flag: bool,
+    selected: int,
+    options: [string],
+    value_text: string,
+    action: string,
+}
+
+export struct UiSettingGroup {
+    id: string,
+    title: string,
+    rows: [UiSettingRow],
+}
+
+export enum NoticeKind {
+    info,
+    warn,
+    error,
+}
+
+export struct UiNotice {
+    id: string,
+    kind: NoticeKind,
+    title: string,
+    body: string,
+}
+
+export struct UiWizard {
+    open: bool,
+    step: int,
+    step_label: string,
+    step_index: int,
+    step_total: int,
+    version: string,
+    loader: int,
+    loader_label: string,
+    loader_version: string,
+    name: string,
+    error: string,
+    busy: bool,
+    can-next: bool,
+}

crates/app/ui/page_state.slint

@@ -0,0 +1,76 @@
+// P3 全量接线的页面状态：一个导出的 global，Slint 任何页面都能直接读/回推。
+//
+// 为什么用 global 而不是继续经 main.slint → shell.slint 逐层转发：属性表已经 100+ 条，
+// 再加五页的数据会把 main.slint 顶破 400 行上限（AGENTS §3）。global 在同一个 Slint
+// 编译单元内是单例，Rust 侧用 `ui.global::<PageState>()` 读写，语义与 property 相同。
+//
+// 纪律：这里只放「页面要显示什么」与「用户点了什么」，业务真相在 Rust 的 state.rs。
+import { UiAccount, UiDeviceCode, UiJavaVendor, UiJavaStep, UiJavaRuntime, UiInstallProgress, UiSettingGroup, UiNotice, UiWizard, UiVersion } from "models.slint";
+
+export global PageState {
+    // ── 账户页 ────────────────────────────────────────────────
+    in-out property <[UiAccount]> accounts;
+    in property <string> active-account: "";
+    in property <UiDeviceCode> device;
+    /// 离线添加表单的输入（不落盘，点「添加」才提交）
+    in-out property <string> offline-name: "";
+
+    // ── Java（下载页 Java 分组 / 设置页 Java 分组）──────────────
+    in property <[UiJavaVendor]> java-vendors;
+    in property <[UiJavaStep]> java-chain;
+    in property <[UiJavaRuntime]> java-runtimes;
+    in property <string> java-order: "";
+    in property <string> java-region: "";
+    in property <string> java-priority-source: "";
+    in property <string> java-message: "";
+    in property <bool> java-busy: false;
+    in property <int> java-target-major: 17;
+
+    // ── 安装进度（下载页 + 向导共用）────────────────────────────
+    in property <UiInstallProgress> install;
+    /// 下载页右侧视图：0 = 版本列表，1 = Java 运行时（截图通道也从这里切）
+    in-out property <int> download-tab: 0;
+
+    // ── 设置分组（settings_bridge 同源 launcher.json）──────────
+    in property <[UiSettingGroup]> setting-groups;
+    in-out property <string> setting-tab: "download";
+
+    // ── 通知条 / 向导 ─────────────────────────────────────────
+    in property <[UiNotice]> notices;
+    in property <UiWizard> wizard;
+    in property <[UiVersion]> wizard-versions;
+
+    // ── 账户 ──────────────────────────────────────────────────
+    callback account-add-offline(string);
+    callback account-remove(string);
+    callback account-switch(string);
+    callback msa-begin();
+    callback msa-cancel();
+
+    // ── Java ──────────────────────────────────────────────────
+    callback java-install(string);
+
+    // ── 设置 ──────────────────────────────────────────────────
+    callback setting-changed(string, string);
+    callback setting-action(string);
+    callback settings-tab-changed(string);
+
+    // ── 通知 ──────────────────────────────────────────────────
+    callback notice-dismiss(string);
+
+    // ── 向导 ──────────────────────────────────────────────────
+    callback wizard-open();
+    callback wizard-close();
+    callback wizard-select-version(string);
+    callback wizard-select-loader(int);
+    callback wizard-name-changed(string);
+    callback wizard-next();
+    callback wizard-back();
+    callback wizard-confirm();
+    callback install-cancel();
+
+    // ── 日志页：崩溃日志导入 / 手动刷新 ──────────────────────────
+    in-out property <string> crash-path: "";
+    callback crash-import(string);
+    callback logs-refresh();
+}

crates/app/ui/pages/download-java.slint

@@ -0,0 +1,204 @@
+// 下载页 · Java 分组（G2 的第二个分类）：四家发行版 + 回退链可视化 + 本地运行时。
+//
+// 回退链是「可观测性」核心：安装失败时用户要能看见 Temurin 跳过 → Oracle 失败 →
+// Microsoft 命中的每一步原因（D23），而不是只看到一句「下载失败」。
+import { Theme } from "../theme/tokens.slint";
+import { Metrics } from "../theme/metrics.slint";
+import { UiJavaVendor, UiJavaStep, UiJavaRuntime, JavaStepOutcome } from "../models.slint";
+import { PageState } from "../page_state.slint";
+import { UiText, TextRole } from "../components/label.slint";
+import { Badge } from "../components/badge.slint";
+import { AppIcon, IconKind } from "../components/icons.slint";
+import { MetroButton, ButtonKind } from "../widgets/button.slint";
+import { ScrollView } from "std-widgets.slint";
+
+component ChainStep inherits Rectangle {
+    in property <UiJavaStep> step;
+
+    height: 26px;
+    background: transparent;
+
+    HorizontalLayout {
+        spacing: Metrics.gap-1;
+
+        AppIcon {
+            icon-size: 12px;
+            kind: root.step.outcome == JavaStepOutcome.hit ? IconKind.check
+                : root.step.outcome == JavaStepOutcome.failed ? IconKind.error
+                : root.step.outcome == JavaStepOutcome.skip ? IconKind.warn
+                : IconKind.more;
+            tint: root.step.outcome == JavaStepOutcome.hit ? Theme.state-success
+                : root.step.outcome == JavaStepOutcome.failed ? Theme.state-danger
+                : Theme.fg-secondary;
+        }
+        UiText {
+            role: TextRole.caption;
+            text: root.step.vendor;
+            width: 72px;
+            color: root.step.outcome == JavaStepOutcome.hit ? Theme.state-success : Theme.fg-primary;
+        }
+        Badge {
+            text: root.step.outcome_label;
+            tint: root.step.outcome == JavaStepOutcome.hit ? Theme.state-success
+                : root.step.outcome == JavaStepOutcome.failed ? Theme.state-danger
+                : Theme.fg-secondary;
+        }
+        UiText {
+            role: TextRole.caption;
+            text: root.step.detail;
+            horizontal-stretch: 1;
+            overflow: elide;
+        }
+    }
+}
+
+component VendorRow inherits Rectangle {
+    in property <UiJavaVendor> data;
+    callback install();
+
+    height: 56px;
+    background: vendor-touch.has-hover ? Theme.bg-hover : transparent;
+
+    HorizontalLayout {
+        padding-left: Metrics.gap-3;
+        padding-right: Metrics.gap-3;
+        spacing: Metrics.gap-2;
+
+        UiText {
+            role: TextRole.bodyStrong;
+            text: root.data.rank + ". " + root.data.display;
+            width: 170px;
+        }
+        if root.data.installed : Badge { text: "已装"; tint: Theme.state-success; }
+        UiText {
+            role: TextRole.caption;
+            text: "Java " + root.data.majors;
+            width: 96px;
+        }
+        UiText {
+            role: TextRole.caption;
+            text: root.data.sources;
+            horizontal-stretch: 1;
+            overflow: elide;
+        }
+        MetroButton {
+            kind: ButtonKind.standard;
+            text: "安装此家";
+            button-height: 26px;
+            enabled: !PageState.java-busy;
+            clicked => { root.install(); }
+        }
+    }
+
+    vendor-touch := TouchArea {
+        mouse-cursor: pointer;
+        clicked => { root.install(); }
+    }
+}
+
+export component JavaPanel inherits Rectangle {
+    background: Theme.bg-canvas;
+
+    VerticalLayout {
+        // 顶栏：地区 / 优先级来源 / 目标大版本 / 一键按回退链安装
+        Rectangle {
+            height: 56px;
+            background: Theme.bg-canvas;
+
+            HorizontalLayout {
+                padding-left: Metrics.gap-4;
+                padding-right: Metrics.gap-4;
+                spacing: Metrics.gap-3;
+
+                UiText {
+                    role: TextRole.subtitle;
+                    text: "Java 运行时";
+                    width: 110px;
+                }
+                UiText {
+                    role: TextRole.caption;
+                    text: "地区 " + PageState.java-region + " · 优先级 " + PageState.java-priority-source
+                        + " · 目标 Java " + PageState.java-target-major;
+                    horizontal-stretch: 1;
+                    overflow: elide;
+                }
+                MetroButton {
+                    kind: ButtonKind.accent;
+                    text: PageState.java-busy ? "安装中…" : "按回退链安装";
+                    button-height: 28px;
+                    enabled: !PageState.java-busy;
+                    clicked => { PageState.java-install(""); }
+                }
+            }
+        }
+
+        UiText {
+            x: Metrics.gap-4;
+            role: TextRole.caption;
+            text: PageState.java-order;
+            horizontal-stretch: 1;
+            overflow: elide;
+        }
+
+        if PageState.java-message != "" : Rectangle {
+            height: 30px;
+            background: Theme.accent-soft;
+            UiText {
+                x: Metrics.gap-4;
+                role: TextRole.caption;
+                text: PageState.java-message;
+                overflow: elide;
+            }
+        }
+
+        Rectangle { height: 1px; background: Theme.stroke; }
+
+        ScrollView {
+            vertical-stretch: 1;
+
+            VerticalLayout {
+                padding-bottom: Metrics.gap-4;
+
+                // 回退链
+                UiText {
+                    x: Metrics.gap-4;
+                    role: TextRole.bodyStrong;
+                    text: "回退链";
+                }
+                for step in PageState.java-chain : ChainStep { step: step; }
+
+                UiText {
+                    x: Metrics.gap-4;
+                    role: TextRole.bodyStrong;
+                    text: "四家发行版";
+                }
+                for vendor in PageState.java-vendors : VendorRow {
+                    data: vendor;
+                    install => { PageState.java-install(vendor.id); }
+                }
+
+                UiText {
+                    x: Metrics.gap-4;
+                    role: TextRole.bodyStrong;
+                    text: "本地已发现";
+                }
+                if PageState.java-runtimes.length == 0 : UiText {
+                    x: Metrics.gap-4;
+                    role: TextRole.caption;
+                    text: "还没有探测到 Java：点上面的「按回退链安装」装一个托管 JDK。";
+                }
+                for runtime in PageState.java-runtimes : Rectangle {
+                    height: 24px;
+                    HorizontalLayout {
+                        padding-left: Metrics.gap-4;
+                        spacing: Metrics.gap-2;
+                        UiText { role: TextRole.caption; text: "Java " + runtime.version; width: 120px; }
+                        UiText { role: TextRole.caption; text: runtime.vendor; width: 96px; }
+                        UiText { role: TextRole.caption; text: runtime.origin; width: 80px; }
+                        UiText { role: TextRole.caption; text: runtime.binary; horizontal-stretch: 1; overflow: elide; }
+                    }
+                }
+            }
+        }
+    }
+}

crates/app/ui/pages/download.slint

@@ -1,14 +1,19 @@
 // G2 下载页（09 §2 P0·G2 / Q24-4 定案）：页内独立左侧分类栏（常驻，非 tab）+ 右侧版本列表。
 // 远古版入口显式可达（ULL 对 HMCL「隐藏」行为的纠偏），下挂 classic/alpha/beta/unlisted 子类树，
 // 进入远古版分类时顶部提示兼容性 + 每行带「远古版」徽标（防误装）。
+//
+// P3 接线：右侧多一个「Java 运行时」视图（四家发行版 + 回退链），页面底部常驻安装进度条。
 import { Theme } from "../theme/tokens.slint";
 import { Metrics } from "../theme/metrics.slint";
 import { UiVersion, VersionKind, DownloadCategory } from "../models.slint";
+import { PageState } from "../page_state.slint";
 import { UiText, TextRole } from "../components/label.slint";
 import { AppIcon, IconKind } from "../components/icons.slint";
 import { Badge } from "../components/badge.slint";
 import { MetroButton, ButtonKind } from "../widgets/button.slint";
 import { SearchField, CheckBox } from "../widgets/inputs.slint";
+import { InstallPanel } from "../components/install-panel.slint";
+import { JavaPanel } from "download-java.slint";
 import { ListView } from "std-widgets.slint";
 
 component CategoryRow inherits Rectangle {
@@ -112,6 +117,8 @@ export component DownloadPage inherits Rectangle {
     in-out property <string> query: "";
     /// 远古版子类树是否展开（默认展开，显式可达）
     in-out property <bool> ancient-expanded: true;
+    /// 右侧视图：0 = 版本列表，1 = Java 运行时
+    in-out property <int> view-tab <=> PageState.download-tab;
 
     callback category-changed(DownloadCategory);
     callback install(string);
@@ -123,148 +130,191 @@ export component DownloadPage inherits Rectangle {
 
     background: Theme.bg-canvas;
 
-    HorizontalLayout {
-        // ── 页内分类侧栏（常驻）───────────────────────────────────
+    VerticalLayout {
+        // 视图切换（版本 / Java）
         Rectangle {
-            width: 200px;
+            height: 40px;
             background: Theme.bg-surface;
-            border-width: 1px;
-            border-color: Theme.stroke;
+            HorizontalLayout {
+                padding-left: Metrics.gap-4;
+                spacing: Metrics.gap-2;
+                UiText {
+                    role: TextRole.subtitle;
+                    text: "版本获取";
+                    width: 96px;
+                }
+                MetroButton {
+                    kind: root.view-tab == 0 ? ButtonKind.accent : ButtonKind.subtle;
+                    text: "版本列表";
+                    button-height: 26px;
+                    clicked => { root.view-tab = 0; }
+                }
+                MetroButton {
+                    kind: root.view-tab == 1 ? ButtonKind.accent : ButtonKind.subtle;
+                    text: "Java 运行时";
+                    button-height: 26px;
+                    clicked => { root.view-tab = 1; }
+                }
+                Rectangle { horizontal-stretch: 1; background: transparent; }
+                if PageState.java-busy : UiText {
+                    role: TextRole.caption;
+                    text: "Java 安装中…";
+                    color: Theme.accent;
+                }
+            }
+        }
+        Rectangle { height: 1px; background: Theme.stroke; }
 
+        if root.view-tab == 0 : HorizontalLayout {
+            vertical-stretch: 1;
+
+            // ── 页内分类侧栏（常驻）───────────────────────────────────
+            Rectangle {
+                width: 200px;
+                background: Theme.bg-surface;
+                border-width: 1px;
+                border-color: Theme.stroke;
+
+                VerticalLayout {
+                    padding-top: Metrics.gap-2;
+
+                    CategoryRow {
+                        label: "正式版 release";
+                        active: root.category == DownloadCategory.release;
+                        clicked => { root.category-changed(DownloadCategory.release); }
+                    }
+                    CategoryRow {
+                        label: "预览版 snapshot";
+                        active: root.category == DownloadCategory.snapshot;
+                        clicked => { root.category-changed(DownloadCategory.snapshot); }
+                    }
+
+                    // 远古版：可展开的父节点 + 子类树
+                    CategoryRow {
+                        label: root.ancient-expanded ? "远古版 ▾" : "远古版 ▸";
+                        active: root.category == DownloadCategory.ancientClassic
+                            || root.category == DownloadCategory.ancientAlpha
+                            || root.category == DownloadCategory.ancientBeta
+                            || root.category == DownloadCategory.ancientUnlisted;
+                        clicked => { root.toggle-ancient(); }
+                    }
+                    if root.ancient-expanded : CategoryRow {
+                        label: "classic（rd-*）";
+                        sub: true;
+                        active: root.category == DownloadCategory.ancientClassic;
+                        clicked => { root.category-changed(DownloadCategory.ancientClassic); }
+                    }
+                    if root.ancient-expanded : CategoryRow {
+                        label: "old_alpha（a1.*）";
+                        sub: true;
+                        active: root.category == DownloadCategory.ancientAlpha;
+                        clicked => { root.category-changed(DownloadCategory.ancientAlpha); }
+                    }
+                    if root.ancient-expanded : CategoryRow {
+                        label: "old_beta（b1.*）";
+                        sub: true;
+                        active: root.category == DownloadCategory.ancientBeta;
+                        clicked => { root.category-changed(DownloadCategory.ancientBeta); }
+                    }
+                    if root.ancient-expanded : CategoryRow {
+                        label: "unlisted 汇总";
+                        sub: true;
+                        active: root.category == DownloadCategory.ancientUnlisted;
+                        clicked => { root.category-changed(DownloadCategory.ancientUnlisted); }
+                    }
+
+                    CategoryRow {
+                        label: "整合包（P1）";
+                        disabled: true;
+                    }
+                    CategoryRow {
+                        label: "Mod（P1）";
+                        disabled: true;
+                    }
+
+                    Rectangle { vertical-stretch: 1; background: transparent; }
+                }
+            }
+
+            // ── 右侧版本列表 ──────────────────────────────────────────
             VerticalLayout {
-                padding-top: Metrics.gap-2;
+                vertical-stretch: 1;
 
-                CategoryRow {
-                    label: "正式版 release";
-                    active: root.category == DownloadCategory.release;
-                    clicked => { root.category-changed(DownloadCategory.release); }
-                }
-                CategoryRow {
-                    label: "预览版 snapshot";
-                    active: root.category == DownloadCategory.snapshot;
-                    clicked => { root.category-changed(DownloadCategory.snapshot); }
+                Rectangle {
+                    height: Metrics.page-header-height;
+                    background: Theme.bg-canvas;
+
+                    HorizontalLayout {
+                        padding-left: Metrics.gap-4;
+                        padding-right: Metrics.gap-4;
+                        spacing: Metrics.gap-3;
+
+                        SearchField {
+                            width: 220px;
+                            placeholder: "筛选版本号";
+                            text <=> root.query;
+                            edited(t) => { root.query-changed(t); }
+                        }
+                        CheckBox {
+                            text: "仅已装";
+                            checked: root.installed-only;
+                            toggled(v) => { root.installed-only-changed(v); }
+                        }
+                        Rectangle { horizontal-stretch: 1; background: transparent; }
+                    }
                 }
 
-                // 远古版：可展开的父节点 + 子类树
-                CategoryRow {
-                    label: root.ancient-expanded ? "远古版 ▾" : "远古版 ▸";
-                    active: root.category == DownloadCategory.ancientClassic
+                // 远古版兼容性提示条（首次进入显示，显式可达的代价告知）
+                Rectangle {
+                    height: 44px;
+                    visible: root.category == DownloadCategory.ancientClassic
                         || root.category == DownloadCategory.ancientAlpha
                         || root.category == DownloadCategory.ancientBeta
                         || root.category == DownloadCategory.ancientUnlisted;
-                    clicked => { root.toggle-ancient(); }
-                }
-                if root.ancient-expanded : CategoryRow {
-                    label: "classic（rd-*）";
-                    sub: true;
-                    active: root.category == DownloadCategory.ancientClassic;
-                    clicked => { root.category-changed(DownloadCategory.ancientClassic); }
-                }
-                if root.ancient-expanded : CategoryRow {
-                    label: "old_alpha（a1.*）";
-                    sub: true;
-                    active: root.category == DownloadCategory.ancientAlpha;
-                    clicked => { root.category-changed(DownloadCategory.ancientAlpha); }
-                }
-                if root.ancient-expanded : CategoryRow {
-                    label: "old_beta（b1.*）";
-                    sub: true;
-                    active: root.category == DownloadCategory.ancientBeta;
-                    clicked => { root.category-changed(DownloadCategory.ancientBeta); }
-                }
-                if root.ancient-expanded : CategoryRow {
-                    label: "unlisted 汇总";
-                    sub: true;
-                    active: root.category == DownloadCategory.ancientUnlisted;
-                    clicked => { root.category-changed(DownloadCategory.ancientUnlisted); }
+                    background: Theme.state-warn-soft;
+
+                    HorizontalLayout {
+                        padding-left: Metrics.gap-4;
+                        padding-right: Metrics.gap-4;
+                        spacing: Metrics.gap-2;
+
+                        AppIcon { kind: IconKind.warn; icon-size: 16px; tint: Theme.state-warn; }
+                        UiText {
+                            role: TextRole.caption;
+                            text: "远古版（classic/alpha/beta）需要旧版 Java 与旧启动参数，装完请先看兼容性说明。";
+                            wrap: word-wrap;
+                            horizontal-stretch: 1;
+                        }
+                        MetroButton {
+                            kind: ButtonKind.subtle;
+                            text: "说明";
+                            button-height: 26px;
+                            clicked => { root.ancient-help(); }
+                        }
+                    }
                 }
 
-                CategoryRow {
-                    label: "整合包（P1）";
-                    disabled: true;
-                }
-                CategoryRow {
-                    label: "Mod（P1）";
-                    disabled: true;
-                }
+                Rectangle { height: 1px; background: Theme.stroke; }
 
-                Rectangle { vertical-stretch: 1; background: transparent; }
+                ListView {
+                    vertical-stretch: 1;
+
+                    for v in root.versions : VersionRow {
+                        data: v;
+                        install => { root.install(v.id); }
+                    }
+                }
             }
         }
 
-        // ── 右侧版本列表 ──────────────────────────────────────────
-        VerticalLayout {
+        if root.view-tab == 1 : JavaPanel {
             vertical-stretch: 1;
+        }
 
-            Rectangle {
-                height: Metrics.page-header-height;
-                background: Theme.bg-canvas;
-
-                HorizontalLayout {
-                    padding-left: Metrics.gap-4;
-                    padding-right: Metrics.gap-4;
-                    spacing: Metrics.gap-3;
-
-                    UiText {
-                        role: TextRole.subtitle;
-                        text: "版本获取";
-                        width: 96px;
-                    }
-                    SearchField {
-                        width: 220px;
-                        placeholder: "筛选版本号";
-                        text <=> root.query;
-                        edited(t) => { root.query-changed(t); }
-                    }
-                    CheckBox {
-                        text: "仅已装";
-                        checked: root.installed-only;
-                        toggled(v) => { root.installed-only-changed(v); }
-                    }
-                    Rectangle { horizontal-stretch: 1; background: transparent; }
-                }
-            }
-
-            // 远古版兼容性提示条（首次进入显示，显式可达的代价告知）
-            Rectangle {
-                height: 44px;
-                visible: root.category == DownloadCategory.ancientClassic
-                    || root.category == DownloadCategory.ancientAlpha
-                    || root.category == DownloadCategory.ancientBeta
-                    || root.category == DownloadCategory.ancientUnlisted;
-                background: Theme.state-warn-soft;
-
-                HorizontalLayout {
-                    padding-left: Metrics.gap-4;
-                    padding-right: Metrics.gap-4;
-                    spacing: Metrics.gap-2;
-
-                    AppIcon { kind: IconKind.warn; icon-size: 16px; tint: Theme.state-warn; }
-                    UiText {
-                        role: TextRole.caption;
-                        text: "远古版（classic/alpha/beta）需要旧版 Java 与旧启动参数，装完请先看兼容性说明。";
-                        wrap: word-wrap;
-                        horizontal-stretch: 1;
-                    }
-                    MetroButton {
-                        kind: ButtonKind.subtle;
-                        text: "说明";
-                        button-height: 26px;
-                        clicked => { root.ancient-help(); }
-                    }
-                }
-            }
-
-            Rectangle { height: 1px; background: Theme.stroke; }
-
-            ListView {
-                vertical-stretch: 1;
-
-                for v in root.versions : VersionRow {
-                    data: v;
-                    install => { root.install(v.id); }
-                }
-            }
+        // 安装进度（下载页行内安装 / 向导共用同一份进度）
+        InstallPanel {
+            data: PageState.install;
+            cancel => { PageState.install-cancel(); }
         }
     }
 }

crates/app/ui/pages/logs.slint

@@ -8,6 +8,7 @@ import { AppIcon, IconKind } from "../components/icons.slint";
 import { Badge } from "../components/badge.slint";
 import { MetroButton, ButtonKind } from "../widgets/button.slint";
 import { SearchField } from "../widgets/inputs.slint";
+import { PageState } from "../page_state.slint";
 import { ListView } from "std-widgets.slint";
 
 component SessionRow inherits Rectangle {
@@ -106,6 +107,8 @@ export component LogsPage inherits Rectangle {
     callback ask-ai(string);
     callback apply-fix();
     callback query-changed(string);
+    /// 重新扫会话索引（手动刷新）
+    callback refresh();
 
     background: Theme.bg-canvas;
 
@@ -157,30 +160,57 @@ export component LogsPage inherits Rectangle {
         VerticalLayout {
             vertical-stretch: 1;
 
+            // 会话头：标题 + 实时标记 + 筛选 + 刷新（第一行），崩溃日志导入（第二行）
             Rectangle {
-                height: 44px;
+                height: 84px;
                 background: Theme.bg-surface;
 
-                HorizontalLayout {
-                    padding-left: Metrics.gap-3;
-                    padding-right: Metrics.gap-3;
-                    spacing: Metrics.gap-2;
+                VerticalLayout {
+                    HorizontalLayout {
+                        height: 44px;
+                        padding-left: Metrics.gap-3;
+                        padding-right: Metrics.gap-3;
+                        spacing: Metrics.gap-2;
 
-                    UiText {
-                        role: TextRole.bodyStrong;
-                        text: root.selected == "" ? "未选择会话" : root.selected;
-                        horizontal-stretch: 1;
+                        UiText {
+                            role: TextRole.bodyStrong;
+                            text: root.selected == "" ? "未选择会话" : root.selected;
+                            horizontal-stretch: 1;
+                            overflow: elide;
+                        }
+                        if root.live : Badge { text: "实时"; tint: Theme.state-success; }
+                        SearchField {
+                            width: 140px;
+                            placeholder: "筛选日志行";
+                            text <=> root.query;
+                            edited(t) => { root.query-changed(t); }
+                        }
+                        MetroButton {
+                            kind: ButtonKind.subtle;
+                            text: "刷新";
+                            button-height: 26px;
+                            clicked => { root.refresh(); }
+                        }
                     }
-                    SearchField {
-                        width: 200px;
-                        placeholder: "筛选日志行";
-                        text <=> root.query;
-                        edited(t) => { root.query-changed(t); }
-                    }
-                    MetroButton {
-                        kind: ButtonKind.subtle;
-                        text: "打开目录";
-                        button-height: 26px;
+
+                    // 崩溃日志导入分析（hs_err_pid*.log / crash-*.txt / latest.log）
+                    HorizontalLayout {
+                        height: 40px;
+                        padding-left: Metrics.gap-3;
+                        padding-right: Metrics.gap-3;
+                        spacing: Metrics.gap-2;
+                        SearchField {
+                            horizontal-stretch: 1;
+                            placeholder: "崩溃日志路径（如 .minecraft/crash-reports/crash-*.txt）";
+                            text <=> PageState.crash-path;
+                        }
+                        MetroButton {
+                            kind: ButtonKind.standard;
+                            text: "导入分析";
+                            button-height: 26px;
+                            enabled: PageState.crash-path != "";
+                            clicked => { PageState.crash-import(PageState.crash-path); }
+                        }
                     }
                 }
             }

crates/app/ui/pages/settings-account.slint

@@ -0,0 +1,194 @@
+// 设置 → 账户（D9 / G6）：三轨账户列表 + 离线添加 + 微软设备码登录 + 删除/切换。
+//
+// 凭据红线：这里能看到的只有「名字 / 轨道 / 公开 UUID / 登录名 / 创建时间」——
+// token 与密码永远不进 UI（Rust 侧的 AccountView 不含这些字段）。
+import { Theme } from "../theme/tokens.slint";
+import { Metrics } from "../theme/metrics.slint";
+import { AccountKind, UiAccount } from "../models.slint";
+import { PageState } from "../page_state.slint";
+import { UiText, TextRole } from "../components/label.slint";
+import { Badge } from "../components/badge.slint";
+import { AppIcon, IconKind } from "../components/icons.slint";
+import { MetroButton, ButtonKind } from "../widgets/button.slint";
+import { SearchField } from "../widgets/inputs.slint";
+import { SettingGroup } from "../widgets/setting-item.slint";
+
+component AccountRow inherits Rectangle {
+    in property <UiAccount> data;
+    callback activate();
+    callback remove();
+
+    height: 56px;
+    background: root.data.active ? Theme.accent-soft : transparent;
+
+    if root.data.active : Rectangle {
+        x: 0;
+        y: 0;
+        width: 3px;
+        height: root.height;
+        background: Theme.accent;
+    }
+
+    HorizontalLayout {
+        padding-left: Metrics.gap-3;
+        padding-right: Metrics.gap-3;
+        spacing: Metrics.gap-2;
+
+        AppIcon {
+            icon-size: 16px;
+            kind: root.data.kind == AccountKind.offline ? IconKind.instances : IconKind.ai;
+            tint: root.data.active ? Theme.accent : Theme.fg-secondary;
+        }
+        VerticalLayout {
+            spacing: 0px;
+            vertical-stretch: 1;
+            UiText { role: TextRole.bodyStrong; text: root.data.name; horizontal-stretch: 1; }
+            UiText {
+                role: TextRole.caption;
+                text: root.data.profile_id + (root.data.login_name == "" ? "" : " · " + root.data.login_name);
+                horizontal-stretch: 1;
+                overflow: elide;
+            }
+        }
+        Badge { text: root.data.kind_label; tint: Theme.fg-secondary; }
+        UiText { role: TextRole.caption; text: root.data.created; width: 108px; }
+        if !root.data.active : MetroButton {
+            kind: ButtonKind.standard;
+            text: "用这个";
+            button-height: 24px;
+            clicked => { root.activate(); }
+        }
+        if root.data.active : Badge { text: "启动中"; tint: Theme.accent; }
+        MetroButton {
+            kind: ButtonKind.subtle;
+            text: "删除";
+            button-height: 24px;
+            clicked => { root.remove(); }
+        }
+    }
+}
+
+export component AccountSection inherits Rectangle {
+    background: transparent;
+
+    VerticalLayout {
+        // 设备码登录面板（Waiting 时显示用户码 + 链接；失败显示原因）
+        if PageState.device.visible : Rectangle {
+            height: PageState.device.busy ? 96px : 84px;
+            background: PageState.device.phase_label == "失败" ? Theme.state-danger-soft : Theme.accent-soft;
+
+            VerticalLayout {
+                padding: Metrics.gap-3;
+                spacing: Metrics.gap-1;
+
+                HorizontalLayout {
+                    spacing: Metrics.gap-2;
+                    AppIcon {
+                        icon-size: 16px;
+                        kind: PageState.device.phase_label == "失败" ? IconKind.error : IconKind.ai;
+                        tint: PageState.device.phase_label == "失败" ? Theme.state-danger : Theme.accent;
+                    }
+                    UiText {
+                        role: TextRole.bodyStrong;
+                        text: "微软登录 · " + PageState.device.phase_label;
+                        horizontal-stretch: 1;
+                    }
+                    if PageState.device.busy : MetroButton {
+                        kind: ButtonKind.subtle;
+                        text: "取消";
+                        button-height: 24px;
+                        clicked => { PageState.msa-cancel(); }
+                    }
+                    if !PageState.device.busy : MetroButton {
+                        kind: ButtonKind.subtle;
+                        text: "关闭";
+                        button-height: 24px;
+                        clicked => { PageState.msa-cancel(); }
+                    }
+                }
+
+                if PageState.device.user_code != "" : HorizontalLayout {
+                    spacing: Metrics.gap-3;
+                    UiText {
+                        role: TextRole.title;
+                        text: PageState.device.user_code;
+                        color: Theme.accent;
+                    }
+                    UiText {
+                        role: TextRole.caption;
+                        text: "在浏览器打开 " + PageState.device.verification_uri + " 输入上面的用户码";
+                        horizontal-stretch: 1;
+                        overflow: elide;
+                    }
+                }
+                UiText {
+                    role: TextRole.caption;
+                    text: PageState.device.message;
+                    horizontal-stretch: 1;
+                    wrap: word-wrap;
+                }
+                if PageState.device.qr_link != "" : UiText {
+                    role: TextRole.monoSmall;
+                    text: PageState.device.qr_link;
+                    horizontal-stretch: 1;
+                    overflow: elide;
+                }
+            }
+        }
+
+        // 离线添加表单
+        SettingGroup { title: "添加离线账户"; }
+        HorizontalLayout {
+            padding-left: Metrics.gap-4;
+            padding-right: Metrics.gap-4;
+            spacing: Metrics.gap-2;
+            SearchField {
+                width: 220px;
+                text <=> PageState.offline-name;
+                placeholder: "玩家名（离线 UUID 自动生成）";
+            }
+            MetroButton {
+                kind: ButtonKind.accent;
+                text: "添加离线";
+                button-height: 28px;
+                enabled: PageState.offline-name != "";
+                clicked => { PageState.account-add-offline(PageState.offline-name); }
+            }
+            MetroButton {
+                kind: ButtonKind.standard;
+                text: "微软登录（设备码）";
+                button-height: 28px;
+                enabled: !PageState.device.busy;
+                clicked => { PageState.msa-begin(); }
+            }
+        }
+
+        // 账户列表
+        SettingGroup { title: "账户（" + PageState.accounts.length + "）"; }
+        if PageState.accounts.length == 0 : Rectangle {
+            height: 72px;
+            VerticalLayout {
+                alignment: center;
+                spacing: 2px;
+                UiText {
+                    role: TextRole.caption;
+                    text: "还没有账户：启动时会用「Player」离线占位。";
+                    horizontal-alignment: center;
+                }
+            }
+        }
+        for account in PageState.accounts : AccountRow {
+            data: account;
+            activate => { PageState.account-switch(account.id); }
+            remove => { PageState.account-remove(account.id); }
+        }
+
+        UiText {
+            role: TextRole.caption;
+            x: Metrics.gap-4;
+            text: "凭据只存在 <数据根>/data/auth/（账号文件与凭据文件分离），界面与 AI 都拿不到 token。";
+            horizontal-stretch: 1;
+            wrap: word-wrap;
+        }
+    }
+}

crates/app/ui/pages/settings-groups.slint

@@ -0,0 +1,117 @@
+// 设置页右栏的「schema 分组」渲染器：下载 / Java / 数据 / AI / MCP 五组。
+//
+// 行来自 Rust 侧的 `SettingGroupView`（core::setting schema 的键），这里只按控件类型画：
+// 开关 → toggle；分段 → segmented；文本 → text；只读 → 纯文案；动作 → 按钮。
+// 写回一律 `PageState.setting-changed(key, value)` / `setting-action(action)`，
+// 由 host 走 `SettingStore::set`（同源 launcher.json）。
+import { Theme } from "../theme/tokens.slint";
+import { Metrics } from "../theme/metrics.slint";
+import { UiSettingGroup, UiSettingRow, SettingControl } from "../models.slint";
+import { PageState } from "../page_state.slint";
+import { UiText, TextRole } from "../components/label.slint";
+import { SettingItem, SettingGroup, ControlKind } from "../widgets/setting-item.slint";
+
+component RowView inherits Rectangle {
+    in property <UiSettingRow> item;
+    /// 文本编辑的本地缓冲（编辑中不回写模型，失焦/回车才提交）
+    in-out property <string> draft;
+
+    height: root.item.control == SettingControl.readonly ? 48px
+        : root.item.description == "" ? 44px : 58px;
+    background: transparent;
+
+    init => { self.draft = root.item.value_text; }
+    changed item => { self.draft = root.item.value_text; }
+
+    if root.item.control == SettingControl.toggle : SettingItem {
+        label: root.item.label;
+        description: root.item.description;
+        kind: ControlKind.toggle;
+        checked: root.item.flag;
+        toggled(v) => { PageState.setting-changed(root.item.key, v ? "true" : "false"); }
+    }
+
+    if root.item.control == SettingControl.choice : SettingItem {
+        label: root.item.label;
+        description: root.item.description;
+        kind: ControlKind.segmented;
+        options: root.item.options;
+        selected: root.item.selected;
+        changed(i) => {
+            if (i >= 0 && i < root.item.options.length) {
+                PageState.setting-changed(root.item.key, root.item.options[i]);
+            }
+        }
+    }
+
+    if root.item.control == SettingControl.text : SettingItem {
+        label: root.item.label;
+        description: root.item.description;
+        kind: ControlKind.text;
+        value: root.draft;
+        edited(t) => {
+            root.draft = t;
+            PageState.setting-changed(root.item.key, t);
+        }
+    }
+
+    if root.item.control == SettingControl.action : SettingItem {
+        label: root.item.label;
+        description: root.item.description;
+        kind: ControlKind.button;
+        button-text: "执行";
+        clicked => { PageState.setting-action(root.item.action); }
+    }
+
+    if root.item.control == SettingControl.readonly : HorizontalLayout {
+        padding-left: Metrics.gap-4;
+        padding-right: Metrics.gap-4;
+        spacing: Metrics.gap-3;
+
+        UiText {
+            role: TextRole.body;
+            text: root.item.label;
+            width: 200px;
+        }
+        UiText {
+            role: TextRole.caption;
+            text: root.item.description;
+            horizontal-stretch: 1;
+            wrap: word-wrap;
+        }
+    }
+}
+
+export component SettingsGroups inherits Rectangle {
+    in property <string> tab: "";
+
+    background: transparent;
+
+    VerticalLayout {
+        padding-bottom: Metrics.gap-5;
+
+        if PageState.setting-groups.length == 0 : Rectangle {
+            height: 120px;
+            VerticalLayout {
+                alignment: center;
+                spacing: 2px;
+                UiText {
+                    role: TextRole.caption;
+                    text: "设置还没加载出来（host 未就绪或数据根不可写）";
+                    horizontal-alignment: center;
+                }
+            }
+        }
+
+        for group in PageState.setting-groups : Rectangle {
+            visible: group.id == root.tab;
+            height: group.rows.length * 58px + 40px;
+            background: transparent;
+
+            VerticalLayout {
+                SettingGroup { title: group.title; }
+                for setting-row in group.rows : RowView { item: setting-row; }
+            }
+        }
+    }
+}

crates/app/ui/pages/settings.slint

@@ -8,6 +8,9 @@ import { SettingSection, TileSize, ThemeMode, BgFillKind } from "../models.slint
 import { UiText, TextRole } from "../components/label.slint";
 import { SettingItem, SettingGroup, ControlKind } from "../widgets/setting-item.slint";
 import { AppearanceSection } from "settings-appearance.slint";
+import { AccountSection } from "settings-account.slint";
+import { SettingsGroups } from "settings-groups.slint";
+import { PageState } from "../page_state.slint";
 import { SearchField } from "../widgets/inputs.slint";
 import { AboutSlint, ScrollView } from "std-widgets.slint";
 
@@ -235,101 +238,15 @@ export component SettingsPage inherits Rectangle {
                         toggled(v) => { root.close-to-tray-changed(v); }
                     }
 
-                    // ── 数据 ────────────────────────────────────────
-                    if root.section == SettingSection.data : SettingGroup { title: "数据目录（D6 三模式）"; }
-                    if root.section == SettingSection.data : SettingItem {
-                        label: "存储模式";
-                        description: "便携（运行目录 .ULL/.minecraft）/ 标准（系统应用数据目录）/ 自定义";
-                        kind: ControlKind.segmented;
-                        options: ["便携", "标准", "自定义"];
-                        selected: root.data-mode;
-                        changed(i) => {
-                            root.data-mode = i;
-                            root.data-mode-changed(i);
-                        }
-                    }
-                    if root.section == SettingSection.data : SettingItem {
-                        label: "当前路径";
-                        description: root.data-path;
-                        kind: ControlKind.button;
-                        button-text: "迁移…";
-                        clicked => { root.migrate-data(); }
-                    }
-
-                    // ── 下载 ────────────────────────────────────────
-                    if root.section == SettingSection.download : SettingGroup { title: "下载（D7）"; }
-                    if root.section == SettingSection.download : SettingItem {
-                        label: "并发数";
-                        kind: ControlKind.segmented;
-                        options: ["4", "8", "16"];
-                        selected: root.download-concurrency;
-                        changed(i) => {
-                            root.download-concurrency = i;
-                            root.download-concurrency-changed(i);
-                        }
-                    }
-                    if root.section == SettingSection.download : SettingItem {
-                        label: "地区判定";
-                        description: "当前：" + root.region-label + "（决定是否走国内镜像）";
-                        kind: ControlKind.button;
-                        button-text: "重新检测";
-                        clicked => { root.detect-region(); }
-                    }
-
-                    // ── Java ────────────────────────────────────────
-                    if root.section == SettingSection.java : SettingGroup { title: "Java（D13）"; }
-                    if root.section == SettingSection.java : SettingItem {
-                        label: "Java 管理";
-                        description: "基准 JDK17 自动下载 · 多版本可选 · 不匹配时黄条提示";
-                        kind: ControlKind.button;
-                        button-text: "管理多版本";
-                        clicked => { root.manage-java(); }
-                    }
-
-                    // ── 账户 ────────────────────────────────────────
-                    if root.section == SettingSection.account : SettingGroup { title: "账户（D9）"; }
-                    if root.section == SettingSection.account : SettingItem {
-                        label: "当前账户";
-                        description: root.account-label;
-                        kind: ControlKind.button;
-                        button-text: "登录 / 切换";
-                        clicked => { root.login(); }
-                    }
-
-                    // ── AI ──────────────────────────────────────────
-                    if root.section == SettingSection.ai : SettingGroup { title: "AI 助手（D4）"; }
-                    if root.section == SettingSection.ai : SettingItem {
-                        label: "模型端点";
-                        description: "OpenAI 兼容 / 本地 llama.cpp / Anthropic / 自定义";
-                        kind: ControlKind.segmented;
-                        options: ["OpenAI", "llama.cpp", "Anthropic", "自定义"];
-                        selected: root.ai-endpoint;
-                        changed(i) => {
-                            root.ai-endpoint = i;
-                            root.ai-endpoint-changed(i);
-                        }
-                    }
-                    if root.section == SettingSection.ai : SettingItem {
-                        label: "YOLO 模式";
-                        description: "跳过全部确认弹窗（审计照记），账户/凭据操作永不 YOLO";
-                        kind: ControlKind.toggle;
-                        checked: root.yolo;
-                        toggled(v) => { root.yolo-changed(v); }
-                    }
-                    if root.section == SettingSection.ai : SettingItem {
-                        label: "MCP server";
-                        description: "允许外部客户端（如 Claude Desktop）调用工具集";
-                        kind: ControlKind.toggle;
-                        checked: root.mcp-enabled;
-                        toggled(v) => { root.mcp-changed(v); }
-                    }
-                    if root.section == SettingSection.ai : SettingItem {
-                        label: "审计日志";
-                        description: "AI 的所有写操作都有记录";
-                        kind: ControlKind.button;
-                        button-text: "查看";
-                        clicked => { root.open-audit-log(); }
-                    }
+                    // ── 数据 / 下载 / Java / 账户 / AI / MCP ────────────
+                    // 行来自 core::setting schema（`PageState.setting-groups`），写回走
+                    // `SettingStore::set`——与 `ull config set` / AI `set_config` 同一份 launcher.json。
+                    if root.section == SettingSection.data : SettingsGroups { tab: "data"; }
+                    if root.section == SettingSection.download : SettingsGroups { tab: "download"; }
+                    if root.section == SettingSection.java : SettingsGroups { tab: "java"; }
+                    if root.section == SettingSection.ai : SettingsGroups { tab: "ai"; }
+                    if root.section == SettingSection.ai : SettingsGroups { tab: "mcp"; }
+                    if root.section == SettingSection.account : AccountSection { }
 
                     // ── 代理 ────────────────────────────────────────
                     if root.section == SettingSection.proxy : SettingGroup { title: "代理"; }

crates/app/ui/shell.slint

@@ -7,6 +7,8 @@ import {
     RouteKind, TileSize, InstanceView, SettingSection, DownloadCategory, ThemeMode, BgFillKind,
     UiTile, UiVersion, UiLogSession, UiLogLine, UiDiagnosis, UiChatMessage, UiDialog, UiToast,
 } from "models.slint";
+import { PageState } from "page_state.slint";
+import { NewInstanceWizard } from "widgets/wizard.slint";
 import { TitleBar } from "components/titlebar.slint";
 import { Nav } from "components/nav.slint";
 import { AiPanel } from "components/ai-panel.slint";
@@ -14,11 +16,13 @@ import { UiText, TextRole } from "components/label.slint";
 import { MetroButton, ButtonKind } from "widgets/button.slint";
 import { DialogHost } from "widgets/dialog.slint";
 import { ToastHost } from "widgets/toast.slint";
+import { NoticeBar } from "components/notice-bar.slint";
 import { InstancesPage } from "pages/instances.slint";
 import { DownloadPage } from "pages/download.slint";
 import { LogsPage } from "pages/logs.slint";
 import { SettingsPage } from "pages/settings.slint";
 
+
 export component AppShell inherits Rectangle {
     // ── 窗口 ────────────────────────────────────────────────────
     in property <string> app-title: "Unlucky Launcher";
@@ -189,6 +193,10 @@ export component AppShell inherits Rectangle {
             request-close => { root.request-close(); }
         }
 
+        NoticeBar {
+            notices: PageState.notices;
+        }
+
         HorizontalLayout {
             // 左侧主导航
             Nav {
@@ -259,6 +267,7 @@ export component AppShell inherits Rectangle {
                     select(id) => { root.log-select(id); }
                     ask-ai(id) => { root.log-ask-ai(id); }
                     apply-fix => { root.log-apply-fix(); }
+                    refresh => { PageState.logs-refresh(); }
                 }
 
                 if root.route == RouteKind.settings : SettingsPage {
@@ -356,6 +365,11 @@ export component AppShell inherits Rectangle {
         }
     }
 
+    // 新建实例向导（全屏模态；数据来自 PageState）
+    NewInstanceWizard {
+        versions: root.versions;
+    }
+
     // 覆盖层：模态队列（一次一条）+ 右下 Toast
     DialogHost {
         current: root.dialog;

crates/app/ui/widgets/wizard.slint

@@ -0,0 +1,301 @@
+// 新建实例向导（G5，全屏模态）：版本 → 加载器 → 名字 → 确认 → 进度。
+// 步骤推进/校验在 Rust（`crate::wizard`），这里只画当前步与提交按钮。
+import { Theme } from "../theme/tokens.slint";
+import { Metrics } from "../theme/metrics.slint";
+import { UiVersion, VersionKind } from "../models.slint";
+import { PageState } from "../page_state.slint";
+import { UiText, TextRole } from "../components/label.slint";
+import { Badge } from "../components/badge.slint";
+import { AppIcon, IconKind } from "../components/icons.slint";
+import { MetroButton, ButtonKind } from "../widgets/button.slint";
+import { SearchField } from "../widgets/inputs.slint";
+import { InstallPanel } from "../components/install-panel.slint";
+import { ScrollView } from "std-widgets.slint";
+
+component StepDot inherits Rectangle {
+    in property <int> index: 0;
+    in property <string> label: "";
+
+    height: 28px;
+    background: transparent;
+
+    HorizontalLayout {
+        spacing: Metrics.gap-1;
+        alignment: center;
+        Rectangle {
+            width: 18px;
+            height: 18px;
+            border-radius: 9px;
+            background: PageState.wizard.step >= root.index ? Theme.accent : Theme.bg-hover;
+            UiText {
+                role: TextRole.caption;
+                text: root.index + 1;
+                horizontal-alignment: center;
+                color: PageState.wizard.step >= root.index ? Theme.fg-on-accent : Theme.fg-secondary;
+            }
+        }
+        UiText {
+            role: TextRole.caption;
+            text: root.label;
+            color: PageState.wizard.step >= root.index ? Theme.fg-primary : Theme.fg-disabled;
+        }
+    }
+}
+
+component VersionChoice inherits Rectangle {
+    in property <UiVersion> data;
+    callback picked();
+
+    height: 36px;
+    background: PageState.wizard.version == root.data.id ? Theme.accent-soft
+        : (touch.has-hover ? Theme.bg-hover : transparent);
+
+    HorizontalLayout {
+        padding-left: Metrics.gap-3;
+        padding-right: Metrics.gap-3;
+        spacing: Metrics.gap-2;
+        UiText { role: TextRole.body; text: root.data.id; width: 160px; }
+        Badge {
+            text: root.data.kind == VersionKind.release ? "正式版" : "预览版";
+            tint: Theme.fg-secondary;
+        }
+        UiText { role: TextRole.caption; text: root.data.released; horizontal-stretch: 1; }
+        if PageState.wizard.version == root.data.id : AppIcon {
+            kind: IconKind.check;
+            icon-size: 14px;
+            tint: Theme.accent;
+        }
+    }
+
+    touch := TouchArea {
+        mouse-cursor: pointer;
+        clicked => { root.picked(); }
+    }
+}
+
+component LoaderChoice inherits Rectangle {
+    in property <string> label: "";
+    in property <string> hint: "";
+    in property <int> index: 0;
+    callback picked();
+
+    height: 48px;
+    background: PageState.wizard.loader == root.index ? Theme.accent-soft
+        : (touch.has-hover ? Theme.bg-hover : transparent);
+
+    HorizontalLayout {
+        padding-left: Metrics.gap-3;
+        padding-right: Metrics.gap-3;
+        spacing: Metrics.gap-2;
+        VerticalLayout {
+            vertical-stretch: 1;
+            spacing: 0px;
+            UiText { role: TextRole.body; text: root.label; }
+            UiText { role: TextRole.caption; text: root.hint; horizontal-stretch: 1; }
+        }
+        if PageState.wizard.loader == root.index : AppIcon {
+            kind: IconKind.check;
+            icon-size: 14px;
+            tint: Theme.accent;
+        }
+    }
+
+    touch := TouchArea {
+        mouse-cursor: pointer;
+        clicked => { root.picked(); }
+    }
+}
+
+export component NewInstanceWizard inherits Rectangle {
+    // 版本列表由 shell 传入（与下载页共用一份，避免二次拉取）
+    in property <[UiVersion]> versions;
+    in-out property <string> query: "";
+
+    visible: PageState.wizard.open;
+    background: rgba(0, 0, 0, 0.45);
+
+    // 吃掉底层点击（模态）
+    TouchArea { }
+
+    Rectangle {
+        x: (parent.width - self.width) / 2;
+        y: (parent.height - self.height) / 2;
+        width: min(parent.width - 80px, 720px);
+        height: min(parent.height - 60px, 560px);
+        background: Theme.bg-surface;
+        border-radius: Metrics.radius-md;
+        border-width: 1px;
+        border-color: Theme.stroke;
+
+        VerticalLayout {
+            // 标题栏
+            Rectangle {
+                height: 52px;
+                background: transparent;
+                HorizontalLayout {
+                    padding-left: Metrics.gap-4;
+                    padding-right: Metrics.gap-3;
+                    spacing: Metrics.gap-2;
+                    UiText {
+                        role: TextRole.subtitle;
+                        text: "新建实例 · " + PageState.wizard.step_label;
+                        horizontal-stretch: 1;
+                    }
+                    MetroButton {
+                        kind: ButtonKind.subtle;
+                        text: "关闭";
+                        button-height: 24px;
+                        clicked => { PageState.wizard-close(); }
+                    }
+                }
+            }
+
+            // 步骤指示
+            HorizontalLayout {
+                padding-left: Metrics.gap-4;
+                spacing: Metrics.gap-3;
+                StepDot { index: 0; label: "版本"; }
+                StepDot { index: 1; label: "加载器"; }
+                StepDot { index: 2; label: "名字"; }
+                StepDot { index: 3; label: "确认"; }
+                StepDot { index: 4; label: "进度"; }
+            }
+
+            Rectangle { height: 1px; background: Theme.stroke; }
+
+            // 步骤内容
+            Rectangle {
+                vertical-stretch: 1;
+                background: transparent;
+
+                // ① 选版本（只列正式版/快照，远古版走下载页的显式入口）
+                if PageState.wizard.step == 0 : VerticalLayout {
+                    padding: Metrics.gap-3;
+                    spacing: Metrics.gap-2;
+                    SearchField {
+                        width: 220px;
+                        text <=> root.query;
+                        placeholder: "筛选版本号";
+                    }
+                    ScrollView {
+                        vertical-stretch: 1;
+                        VerticalLayout {
+                            for v in root.versions : VersionChoice {
+                                visible: !v.ancient;
+                                data: v;
+                                picked => { PageState.wizard-select-version(v.id); }
+                            }
+                        }
+                    }
+                }
+
+                // ② 选加载器
+                if PageState.wizard.step == 1 : VerticalLayout {
+                    padding: Metrics.gap-3;
+                    spacing: 0px;
+                    LoaderChoice { index: 0; label: "原版（Vanilla）"; hint: "不装加载器，最快最稳"; picked => { PageState.wizard-select-loader(0); } }
+                    LoaderChoice { index: 1; label: "Fabric"; hint: "轻量模组加载器（GUI 可直接装）"; picked => { PageState.wizard-select-loader(1); } }
+                    LoaderChoice { index: 2; label: "Quilt"; hint: "Fabric 的分支（GUI 可直接装）"; picked => { PageState.wizard-select-loader(2); } }
+                    LoaderChoice { index: 3; label: "Forge"; hint: "需要 installer processors：本轮请用 ull install"; picked => { PageState.wizard-select-loader(3); } }
+                    LoaderChoice { index: 4; label: "NeoForge"; hint: "需要 installer processors：本轮请用 ull install"; picked => { PageState.wizard-select-loader(4); } }
+                }
+
+                // ③ 名字
+                if PageState.wizard.step == 2 : VerticalLayout {
+                    padding: Metrics.gap-4;
+                    spacing: Metrics.gap-2;
+                    UiText { role: TextRole.body; text: "实例名（默认用版本号）"; }
+                    SearchField {
+                        width: 320px;
+                        text: PageState.wizard.name;
+                        placeholder: "例如：生存 1.20.4";
+                        edited(t) => { PageState.wizard-name-changed(t); }
+                    }
+                    if PageState.wizard.error != "" : UiText {
+                        role: TextRole.caption;
+                        text: PageState.wizard.error;
+                        color: Theme.state-danger;
+                    }
+                    UiText {
+                        role: TextRole.caption;
+                        text: "不能包含 / \\ : * ? \" < > |，最多 64 个字符。";
+                    }
+                }
+
+                // ④ 确认
+                if PageState.wizard.step == 3 : VerticalLayout {
+                    padding: Metrics.gap-4;
+                    spacing: Metrics.gap-2;
+                    UiText { role: TextRole.bodyStrong; text: "将创建实例"; }
+                    UiText { role: TextRole.body; text: "版本 " + PageState.wizard.version; }
+                    UiText { role: TextRole.body; text: "加载器 " + PageState.wizard.loader_label; }
+                    UiText { role: TextRole.body; text: "实例名 " + PageState.wizard.name; }
+                    UiText {
+                        role: TextRole.caption;
+                        text: "确认后会按 core 安装管线下载：版本 JSON → 客户端 jar → 库 → 资源索引 → 登记实例。";
+                        wrap: word-wrap;
+                    }
+                    if PageState.wizard.error != "" : UiText {
+                        role: TextRole.caption;
+                        text: PageState.wizard.error;
+                        color: Theme.state-danger;
+                    }
+                }
+
+                // ⑤ 进度
+                if PageState.wizard.step == 4 : VerticalLayout {
+                    padding: Metrics.gap-3;
+                    spacing: Metrics.gap-2;
+                    InstallPanel {
+                        data: PageState.install;
+                        cancel => { PageState.install-cancel(); }
+                    }
+                    UiText {
+                        role: TextRole.caption;
+                        text: "装完会自动跳到实例页；失败原因会显示在上面。";
+                    }
+                }
+            }
+
+            Rectangle { height: 1px; background: Theme.stroke; }
+
+            // 底部按钮
+            Rectangle {
+                height: 56px;
+                background: transparent;
+                HorizontalLayout {
+                    padding: Metrics.gap-4;
+                    spacing: Metrics.gap-2;
+                    Rectangle { horizontal-stretch: 1; background: transparent; }
+                    MetroButton {
+                        kind: ButtonKind.subtle;
+                        text: "上一步";
+                        button-height: 30px;
+                        enabled: PageState.wizard.step > 0 && PageState.wizard.step < 4;
+                        clicked => { PageState.wizard-back(); }
+                    }
+                    if PageState.wizard.step < 3 : MetroButton {
+                        kind: ButtonKind.accent;
+                        text: "下一步";
+                        button-height: 30px;
+                        enabled: PageState.wizard.can-next;
+                        clicked => { PageState.wizard-next(); }
+                    }
+                    if PageState.wizard.step == 3 : MetroButton {
+                        kind: ButtonKind.accent;
+                        text: "开始安装";
+                        button-height: 30px;
+                        enabled: PageState.wizard.can-next && !PageState.wizard.busy;
+                        clicked => { PageState.wizard-confirm(); }
+                    }
+                    if PageState.wizard.step == 4 : MetroButton {
+                        kind: ButtonKind.standard;
+                        text: "后台继续";
+                        button-height: 30px;
+                        clicked => { PageState.wizard-close(); }
+                    }
+                }
+            }
+        }
+    }
+}