feat(presenter): 新建 unlucky-presenter，把 host/状态/DTO/设置桥从 app 迁出（M85 第 1 块）

D26（iced 重写）的关键一次性动作：UI 框架无关的宿主层独立成 crate，
Slint 版（crates/app）与 iced 版（crates/app-iced）共用，Slint 退役后不再重写一遍。

- 新建 crates/presenter（package `unlucky-presenter` / lib `unlucky_presenter`），
  workspace 登记 + crate 文档头写清「这层为什么存在」、对外表面、UI 侧允许/禁止、
  iced 接线骨架、以及哪些东西留在了 crates/app 及为什么。
- `git mv`（保留文件历史）迁入：host/（25 文件）、dto/（11 文件）、state.rs(+tests)、
  prefs.rs、settings_bridge.rs、toast.rs、router.rs、dialogs.rs、wizard.rs、
  mock.rs、mock_data.rs、backend.rs。模块路径与公开 API 名称不变（`host::install` 等），
  内部实现零改动。
- 新增 `theme`：把原本混在 ui_bind/theme_runtime 里的**纯判据**（CONFIG_POLL_TICKS /
  SYSTEM_THEME_POLL_TICKS / TILE_REGENERATE_STEP / BackgroundKey / tile_viewport /
  system_theme_value / 两个 poll 判据）抽出来，附 5 个单测；app 侧改成调用它们。
- crates/app 改为消费者：删掉迁走的文件，`crate::host|state|dto|prefs|settings_bridge|
  toast|router|dialogs|wizard|mock|mock_data|backend` 全部改写为 `unlucky_presenter::*`
  （64 处），backend.rs 的 config_path/build_backend 提为 pub。
- crates/app-iced 只登记 unlucky-presenter 依赖，本 mission 不接线。
- prefs.rs 的 2 处 slint 文档引用改写；`grep -rn slint crates/presenter` 现在无输出。

crates/presenter/src/mock.rs

@@ -0,0 +1,366 @@
+//! P0 假后端：用脚本化事件驱动骨架，验证 app ↔ core/agent 通道语义。
+//!
+//! 覆盖四条通道：实例运行状态（磁贴进度环）、AI 流式会话（含工具调用）、
+//! 对话框队列（进度对话框）、Toast。阶段 B 里由真正的 core/agent host 替换
+//! [`MockBackend`]，[`crate::dto::Backend`] 之上的 state/reducer 不动。
+//! 假数据本体在 [`crate::mock_data`]。
+
+use std::collections::VecDeque;
+use std::time::Duration;
+
+use crate::dialogs::{DialogKind, DialogRequest, DialogSource};
+use crate::dto::{
+    AgentEvent, AppCommand, AppEvent, Backend, ChatMessage, ChatRole, CoreEvent, InstanceId,
+    InstanceRuntime, LaunchStage, Progress,
+};
+use crate::mock_data::{mock_instances, mock_log_lines, mock_log_sessions, mock_versions};
+use crate::toast::{Toast, ToastKind};
+
+/// 启动脚本：按时间推进 download → verify → launch → running。
+#[derive(Debug)]
+struct LaunchScript {
+    id: InstanceId,
+    elapsed_ms: u64,
+}
+
+/// AI 流式脚本：每条提问回一段可切分的话 + 一次工具调用。
+#[derive(Debug)]
+struct ChatScript {
+    elapsed_ms: u64,
+    chunks: VecDeque<String>,
+    /// 流式助手消息在 app 会话里的序号
+    message_index: usize,
+}
+
+/// 假后端。
+#[derive(Debug, Default)]
+pub struct MockBackend {
+    events: VecDeque<AppEvent>,
+    launch: Option<LaunchScript>,
+    chat: Option<ChatScript>,
+    /// 已投递给 app 的会话消息条数（用来给 MessageDelta 算序号）
+    emitted_messages: usize,
+    next_dialog: u64,
+}
+
+impl MockBackend {
+    /// 预置一批假数据事件（实例/版本/日志会话）。
+    pub fn new() -> Self {
+        let mut backend = Self::default();
+        backend.seed();
+        backend
+    }
+
+    fn seed(&mut self) {
+        self.events.push_back(AppEvent::Core(
+            CoreEvent::InstancesChanged(mock_instances()),
+        ));
+        self.events
+            .push_back(AppEvent::Core(CoreEvent::VersionListChanged(
+                mock_versions(),
+            )));
+        self.events
+            .push_back(AppEvent::Core(CoreEvent::LogSessionsChanged(
+                mock_log_sessions(),
+            )));
+        self.events
+            .push_back(AppEvent::Core(CoreEvent::LogLinesChanged(mock_log_lines())));
+    }
+
+    fn emit(&mut self, event: AppEvent) {
+        self.events.push_back(event);
+    }
+
+    fn next_dialog_id(&mut self) -> u64 {
+        self.next_dialog += 1;
+        self.next_dialog
+    }
+
+    fn script_launch(&mut self, id: InstanceId) {
+        self.emit(AppEvent::Core(CoreEvent::InstanceRuntimeChanged {
+            id: id.clone(),
+            runtime: InstanceRuntime::Busy {
+                stage: LaunchStage::Download,
+                progress: Progress {
+                    done: 0,
+                    total: 1_500,
+                },
+            },
+        }));
+        self.launch = Some(LaunchScript { id, elapsed_ms: 0 });
+    }
+
+    fn step_launch(&mut self, elapsed: Duration) {
+        let Some((id, elapsed_ms)) = self.launch.as_mut().map(|script| {
+            script.elapsed_ms += u64::try_from(elapsed.as_millis()).unwrap_or(u64::MAX);
+            (script.id.clone(), script.elapsed_ms)
+        }) else {
+            return;
+        };
+
+        // 0~1.5s 下载、1.5~2.5s 校验、2.5~3s 启动、3s 后转为运行中
+        let runtime = if elapsed_ms < 1_500 {
+            InstanceRuntime::Busy {
+                stage: LaunchStage::Download,
+                progress: Progress {
+                    done: elapsed_ms,
+                    total: 1_500,
+                },
+            }
+        } else if elapsed_ms < 2_500 {
+            InstanceRuntime::Busy {
+                stage: LaunchStage::Verify,
+                progress: Progress {
+                    done: elapsed_ms - 1_500,
+                    total: 1_000,
+                },
+            }
+        } else if elapsed_ms < 3_000 {
+            InstanceRuntime::Busy {
+                stage: LaunchStage::Launch,
+                progress: Progress {
+                    done: elapsed_ms - 2_500,
+                    total: 500,
+                },
+            }
+        } else {
+            self.launch = None;
+            self.emit(AppEvent::Toast(Toast {
+                id: 0,
+                kind: ToastKind::Success,
+                text: "游戏已启动".to_string(),
+                remaining_ms: 0,
+            }));
+            InstanceRuntime::Running { pid: 12_345 }
+        };
+
+        self.emit(AppEvent::Core(CoreEvent::InstanceRuntimeChanged {
+            id,
+            runtime,
+        }));
+    }
+
+    fn script_chat(&mut self, text: String) {
+        let user_index = self.emitted_messages;
+        self.emit(AppEvent::Agent(AgentEvent::MessageAppended(
+            ChatMessage::user(text),
+        )));
+        self.emit(AppEvent::Agent(AgentEvent::MessageAppended(
+            ChatMessage::assistant_stream(),
+        )));
+        self.emitted_messages += 2;
+        self.chat = Some(ChatScript {
+            elapsed_ms: 0,
+            chunks: VecDeque::from(vec![
+                "先确认版本：".to_string(),
+                "官方 1.20.4 是正式版，".to_string(),
+                "装完再用 Fabric 加加载器。".to_string(),
+            ]),
+            message_index: user_index + 1,
+        });
+    }
+
+    fn step_chat(&mut self, elapsed: Duration) {
+        let Some(chat) = self.chat.as_mut() else {
+            return;
+        };
+        chat.elapsed_ms += u64::try_from(elapsed.as_millis()).unwrap_or(u64::MAX);
+        if chat.elapsed_ms < 300 {
+            return;
+        }
+        chat.elapsed_ms = 0;
+        let index = chat.message_index;
+        let chunk = chat.chunks.pop_front();
+
+        if let Some(delta) = chunk {
+            self.emit(AppEvent::Agent(AgentEvent::MessageDelta { index, delta }));
+            return;
+        }
+
+        // 流结束后补一次工具调用（工具执行在会话里可见）+ 收尾消息
+        self.emit(AppEvent::Agent(AgentEvent::ToolCallStarted {
+            name: "read_game_log".to_string(),
+            summary: "读取最近一次崩溃日志".to_string(),
+        }));
+        self.emit(AppEvent::Agent(AgentEvent::ToolCallFinished {
+            name: "read_game_log".to_string(),
+            ok: true,
+            summary: "读到 128 行，无 ERROR".to_string(),
+        }));
+        self.emit(AppEvent::Agent(AgentEvent::MessageFinished { index }));
+        self.emit(AppEvent::Agent(AgentEvent::MessageAppended(ChatMessage {
+            role: ChatRole::Assistant,
+            text: "日志没有 ERROR，问题更可能在 Java 版本。".to_string(),
+            tool: None,
+            streaming: false,
+        })));
+        self.emitted_messages += 2;
+        self.chat = None;
+    }
+
+    fn script_install(&mut self, version: String) {
+        let id = self.next_dialog_id();
+        self.emit(AppEvent::DialogRequested(DialogRequest {
+            id,
+            source: DialogSource::BackgroundTask,
+            title: format!("正在安装 {version}"),
+            body: String::new(),
+            kind: DialogKind::Progress {
+                label: "下载资源".to_string(),
+                progress: 0.0,
+            },
+        }));
+        self.emit(AppEvent::DialogClosed(id));
+        self.emit(AppEvent::Toast(Toast {
+            id: 0,
+            kind: ToastKind::Success,
+            text: format!("{version} 安装完成"),
+            remaining_ms: 0,
+        }));
+    }
+}
+
+impl Backend for MockBackend {
+    fn drain_events(&mut self) -> Vec<AppEvent> {
+        self.events.drain(..).collect()
+    }
+
+    fn dispatch(&mut self, command: AppCommand) {
+        match command {
+            AppCommand::LaunchInstance(id) => self.script_launch(id),
+            AppCommand::StopInstance(id) => {
+                self.launch = None;
+                self.emit(AppEvent::Core(CoreEvent::InstanceRuntimeChanged {
+                    id,
+                    runtime: InstanceRuntime::Idle,
+                }));
+            }
+            AppCommand::AskAgent(text) => self.script_chat(text),
+            AppCommand::InstallVersion(version) => self.script_install(version),
+            AppCommand::SetYolo(enabled) => self.emit(AppEvent::Toast(Toast {
+                id: 0,
+                kind: ToastKind::Info,
+                text: if enabled {
+                    "YOLO 已开启（审计照记）"
+                } else {
+                    "YOLO 已关闭"
+                }
+                .to_string(),
+                remaining_ms: 0,
+            })),
+            AppCommand::ListVersions(category) => {
+                self.emit(AppEvent::Core(CoreEvent::VersionListChanged(
+                    crate::mock_data::mock_versions_for(category),
+                )));
+            }
+            AppCommand::OpenLogSession(id) => {
+                // P0：换会话 = 换一批假日志行 + 一条诊断结论（日志页诊断卡片可见）
+                self.emit(AppEvent::Core(CoreEvent::LogLinesChanged(mock_log_lines())));
+                self.emit(AppEvent::Core(CoreEvent::DiagnosisReady(
+                    crate::mock_data::mock_diagnosis(id),
+                )));
+            }
+            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
+            _ => {}
+        }
+    }
+
+    fn tick(&mut self, elapsed: Duration) {
+        self.step_launch(elapsed);
+        self.step_chat(elapsed);
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::MockBackend;
+    use crate::dto::{AgentEvent, AppCommand, AppEvent, Backend, CoreEvent, InstanceRuntime};
+
+    #[test]
+    fn seeds_instances_and_versions() {
+        let mut backend = MockBackend::new();
+        let events = backend.drain_events();
+        assert_eq!(events.len(), 4);
+        assert!(events
+            .iter()
+            .all(|event| matches!(event, AppEvent::Core(_))));
+        assert!(backend.drain_events().is_empty());
+    }
+
+    #[test]
+    fn launching_emits_progress_then_running() {
+        let mut backend = MockBackend::new();
+        backend.drain_events();
+        backend.dispatch(AppCommand::LaunchInstance("survival".to_string()));
+
+        let first = backend.drain_events();
+        assert!(matches!(
+            first[0],
+            AppEvent::Core(CoreEvent::InstanceRuntimeChanged { .. })
+        ));
+
+        backend.tick(std::time::Duration::from_millis(1_600));
+        let verify = backend.drain_events();
+        match &verify[0] {
+            AppEvent::Core(CoreEvent::InstanceRuntimeChanged {
+                runtime: InstanceRuntime::Busy { stage, .. },
+                ..
+            }) => assert_eq!(*stage, crate::dto::LaunchStage::Verify),
+            other => panic!("unexpected event: {other:?}"),
+        }
+
+        backend.tick(std::time::Duration::from_millis(2_000));
+        let done = backend.drain_events();
+        assert!(done.iter().any(|event| matches!(
+            event,
+            AppEvent::Core(CoreEvent::InstanceRuntimeChanged {
+                runtime: InstanceRuntime::Running { .. },
+                ..
+            })
+        )));
+    }
+
+    #[test]
+    fn stopping_cancels_the_launch_script() {
+        let mut backend = MockBackend::new();
+        backend.drain_events();
+        backend.dispatch(AppCommand::LaunchInstance("a".to_string()));
+        backend.drain_events();
+
+        backend.dispatch(AppCommand::StopInstance("a".to_string()));
+        let events = backend.drain_events();
+        assert!(matches!(
+            events[0],
+            AppEvent::Core(CoreEvent::InstanceRuntimeChanged {
+                runtime: InstanceRuntime::Idle,
+                ..
+            })
+        ));
+
+        // 脚本已取消：再推进时间也不会再产出事件
+        backend.tick(std::time::Duration::from_millis(5_000));
+        assert!(backend.drain_events().is_empty());
+    }
+
+    #[test]
+    fn asking_the_agent_streams_and_finishes() {
+        let mut backend = MockBackend::new();
+        backend.drain_events();
+        backend.dispatch(AppCommand::AskAgent("装哪个版本".to_string()));
+
+        let start = backend.drain_events();
+        assert_eq!(start.len(), 2);
+
+        let mut deltas = 0;
+        for _ in 0..6 {
+            backend.tick(std::time::Duration::from_millis(400));
+            let events = backend.drain_events();
+            deltas += events
+                .iter()
+                .filter(|event| matches!(event, AppEvent::Agent(AgentEvent::MessageDelta { .. })))
+                .count();
+        }
+        assert_eq!(deltas, 3);
+    }
+}