diff --git a/crates/app-iced/src/app/update/account.rs b/crates/app-iced/src/app/update/account.rs
index a167ee9..0277f01 100644
--- a/crates/app-iced/src/app/update/account.rs
+++ b/crates/app-iced/src/app/update/account.rs
@@ -7,24 +7,38 @@
 //! 2. **密码只走一次**：`Submit` 把 `AuthlibRequest` 交给后端后立刻清掉表单里的密码
 //!    （成功失败都清——重试用新输入，不在内存里多留一份凭据）；
 //! 3. **表单态是纯 UI 状态**：输入框改动只写 `App::account_form` + 置脏，不派命令。
+//!
+//! ## 返回 `Task`（M114 r2 / 复审 P2-1）
+//!
+//! 复制用户码/链接必须把 `iced::clipboard::write` 的 `Task` **交回 runtime**——iced 0.14 的
+//! `Task` 是惰性 stream，丢掉返回值等于永不执行（日志页的 Copy summary 就是正确写法）。
 
-use unlucky_presenter::dto::{AppCommand, AuthlibRequest};
+use iced::Task;
+use unlucky_presenter::dto::{AccountKind, AppCommand, AuthlibRequest};
 
-use crate::pages::account::{Message as Account, Panel, Track};
+use crate::app::Message;
+use crate::pages::account::{Hint, Message as Account, Panel, Track};
 
 use super::super::state::App;
 
 impl App {
     /// 账户页消息。
-    pub(super) fn on_account(&mut self, message: Account) {
+    pub(super) fn on_account(&mut self, message: Account) -> Task<Message> {
+        // 复制是唯一需要**交回 Task** 的分支：先把它的 Task 抓出来，其余分支照旧改状态
+        let clipboard = match &message {
+            Account::Copy(text) => Some(text.clone()),
+            _ => None,
+        };
+
         match message {
             Account::Open(track) => {
                 self.account_form.open(track);
-                // 微软面板一打开就把「设备码」这条路准备好：用户点开就该看到码或选择按钮，
-                // 而不是再点一次「登录」（面板里的两条流按钮仍然可选）
-                if track == Track::Microsoft && self.state.device_login.phase.visible() {
-                    self.account_form.panel = Panel::Microsoft;
-                }
+                self.account_form.hint = None;
+                self.view_dirty = true;
+            }
+            Account::ToggleAdd => {
+                self.account_form.section_open = !self.account_form.section_open;
+                self.account_form.hint = None;
                 self.view_dirty = true;
             }
             Account::Close => {
@@ -35,6 +49,7 @@ impl App {
                 }
                 self.view_dirty = true;
             }
+            Account::DismissNotice => self.dispatch(AppCommand::DismissAccountNotice),
             Account::Server(value) => {
                 self.account_form.server = value;
                 self.view_dirty = true;
@@ -59,15 +74,14 @@ impl App {
             }
             Account::Submit => match self.account_form.panel {
                 Panel::Offline => {
+                    // 名字**不清空**：失败时用户还要看见自己输入的（复审 r1 P2-2 的另一半）
                     let name = self.account_form.offline_name.trim().to_string();
                     if !name.is_empty() {
-                        self.account_form.offline_name.clear();
                         self.dispatch(AppCommand::AddOfflineAccount(name));
                     }
                 }
                 Panel::Authlib => {
-                    let ready = self.account_form.authlib_ready();
-                    if ready {
+                    if self.account_form.authlib_ready() {
                         let request = AuthlibRequest::new(
                             self.account_form.server.clone(),
                             self.account_form.login.clone(),
@@ -76,7 +90,7 @@ impl App {
                         self.dispatch(AppCommand::AddAuthlibAccount(request));
                     }
                 }
-                Panel::Microsoft => self.on_account(Account::StartBrowser),
+                Panel::Microsoft => return self.on_account(Account::StartBrowser),
                 Panel::None => {}
             },
             Account::StartDevice => self.dispatch(AppCommand::StartDeviceLogin),
@@ -85,26 +99,62 @@ impl App {
                 self.account_form.close();
                 self.dispatch(AppCommand::CancelDeviceLogin);
             }
-            Account::Copy(text) => {
-                // 剪贴板只放用户码/链接这类**公开**内容（凭据永不经过这条路径）
-                let _: iced::Task<crate::app::Message> = iced::clipboard::write(text);
-            }
+            Account::Copy(_) => {}
             Account::Switch(id) => self.dispatch(AppCommand::SwitchAccount(id)),
             Account::Remove(id) => self.dispatch(AppCommand::RemoveAccount(id)),
-            Account::Relogin => {
-                // 「重新登录」按微软轨的默认流走（授权码 + 系统浏览器）
+            Account::Relogin(id) => return self.relogin(&id),
+        }
+        self.refresh_view();
+
+        match clipboard {
+            Some(text) => iced::clipboard::write(text),
+            None => Task::none(),
+        }
+    }
+
+    /// 「重新登录」按**账户类型**分派（复审 r1 P2-3）。
+    ///
+    /// - 微软轨：走授权码流（原路）；
+    /// - 第三方轨：第三方站没有「一键重登」——预填服务器地址与登录名，让用户补密码；
+    /// - 本地档案：没有服务器账户可重登 ⇒ 明确说明，不假装能做。
+    fn relogin(&mut self, id: &str) -> Task<Message> {
+        let Some(account) = self
+            .state
+            .accounts
+            .iter()
+            .find(|account| account.id == id)
+            .cloned()
+        else {
+            return Task::none();
+        };
+        self.account_form.hint = None;
+        match account.kind {
+            AccountKind::Microsoft => {
                 self.account_form.panel = Panel::Microsoft;
                 self.dispatch(AppCommand::StartBrowserLogin);
             }
+            AccountKind::Authlib => {
+                self.account_form.open(Track::Authlib);
+                self.account_form.server = account.server_url.clone();
+                self.account_form.login = account.login_name.clone();
+                self.account_form.password.clear();
+                self.account_form.hint = Some(Hint::AuthlibReauth);
+                self.view_dirty = true;
+                self.refresh_view();
+            }
+            AccountKind::Offline => {
+                self.account_form.hint = Some(Hint::OfflineNoRelogin);
+                self.view_dirty = true;
+                self.refresh_view();
+            }
         }
-        self.refresh_view();
+        Task::none()
     }
 }
 
-/// 取证开关 `ULL_ACCOUNT_STATE` 的落地：把「很难自然等到」的状态钉死一次。
+/// 取证开关 `ULL_ACCOUNT_STATE` 的落地（**只在 `--screenshot` 下生效**）。
 ///
-/// 为什么需要：设备码过期要等 15 分钟、第三方站表单要手点两下，截图通道等不到。这里只在
-/// **截图模式**下生效（`--screenshot`），交互模式一律不读——与 `ULL_START_ROUTE` 同一口径。
+/// 为什么需要：设备码过期要等 15 分钟、表单要手点两下，截图通道等不到自然发生的状态。
 pub(super) fn force_account_state(app: &mut App) {
     if !app.has_screenshot() {
         return;
@@ -118,7 +168,7 @@ pub(super) fn force_account_state(app: &mut App) {
             app.state.device_login_started =
                 Some(std::time::Instant::now() - std::time::Duration::from_secs(3_600));
         }
-        // 第三方站表单：直接把面板打开并预填地址（截图要看到输入框与校验按钮）
+        // 第三方站表单：直接把面板打开并预填地址
         "authlib" | "authlib-form" => {
             app.account_form.panel = crate::pages::account::Panel::Authlib;
             if app.account_form.server.trim().is_empty() {
@@ -127,13 +177,17 @@ pub(super) fn force_account_state(app: &mut App) {
             app.account_form.login = "steve@example.com".to_string();
             app.account_form.password = "not-a-real-password".to_string();
         }
+        // 有账号时「Add an account」展开态（P2-4 的收敛后形态）
+        "add" => {
+            app.account_form.section_open = true;
+        }
         _ => {}
     }
 }
 
 #[cfg(test)]
 mod tests {
-    use crate::pages::account::{Message as Account, Panel, Track};
+    use crate::pages::account::{Form, Panel, Track};
 
     /// 表单态是纯 UI 状态：打开/关闭面板不派命令，但会把面板切对。
     ///
@@ -141,7 +195,6 @@ mod tests {
     /// 抓不住：真实 dispatch 的副作用（那要真后端）。
     #[test]
     fn the_form_state_follows_the_page_messages() {
-        use crate::pages::account::Form;
         let mut form = Form::new();
         assert_eq!(form.panel, Panel::None);
         form.open(Track::Authlib);
@@ -150,7 +203,14 @@ mod tests {
         form.close();
         assert_eq!(form.panel, Panel::None);
         assert!(form.password.is_empty(), "关闭面板必须把一次性密码清掉");
+    }
 
-        let _ = Account::Open(Track::Offline);
+    /// 三张轨道卡默认收起（有账号时），`ToggleAdd` 展开（复审 r1 P2-4）。
+    #[test]
+    fn the_add_section_starts_collapsed() {
+        let mut form = Form::new();
+        assert!(!form.section_open);
+        form.section_open = true;
+        assert!(form.section_open);
     }
 }
diff --git a/crates/app-iced/src/app/update/page_messages.rs b/crates/app-iced/src/app/update/page_messages.rs
index 4ecea99..2247c88 100644
--- a/crates/app-iced/src/app/update/page_messages.rs
+++ b/crates/app-iced/src/app/update/page_messages.rs
@@ -89,7 +89,7 @@ impl App {
                 self.refresh_view();
             }
             // M114：账户页（三轨登录 / 列表动作 / 表单输入）
-            pages::Message::Account(message) => self.on_account(message),
+            pages::Message::Account(message) => return self.on_account(message),
             // 还没接后端的占位动作：只打日志（哪几个、为什么，见 pages 模块文档的偏离登记）
             pages::Message::Action(action) => {
                 eprintln!("[page] 占位动作 {action:?} pressed（没有对应 AppCommand）");
diff --git a/crates/app-iced/src/app/view.rs b/crates/app-iced/src/app/view.rs
index 05fcbef..44ac62a 100644
--- a/crates/app-iced/src/app/view.rs
+++ b/crates/app-iced/src/app/view.rs
@@ -18,6 +18,7 @@ use super::message::{nav_item_of, Message};
 use super::state::{log_first_frame, App};
 use super::APP_TITLE;
 
+mod account_page;
 mod logs;
 mod rail;
 
@@ -58,10 +59,12 @@ impl App {
 
         let account = self.rail_account();
         match pages::Screen::of(self.state.route()) {
-            Some(_) => shell::view_with_background(
+            Some(_) => shell::view_with_account(
                 &self.ui,
-                nav_item_of(self.state.route()),
-                &account,
+                shell::NavRail {
+                    selected: nav_item_of(self.state.route()),
+                    account: account.clone(),
+                },
                 APP_TITLE,
                 background,
                 // M101 r2：设置页的只读状态（外观运行期状态 + 各组自己的状态）一次递进去。
@@ -83,36 +86,17 @@ impl App {
                 self.lang(),
             ),
             // 账户页（M114）：它不走 `pages::Screen` 那四页的 `Model`，自己一棵树
-            // （模型在 `App::account`，由 `refresh_view` 按同一条门控重建；宽度用 M104 的
-            // 中栏可用宽，与其它页同源）。
-            None if self.state.route() == &Route::Accounts => shell::view_with_background(
-                &self.ui,
-                NavItem::Account,
-                &account,
-                APP_TITLE,
-                background,
-                pages::account::view(
-                    &self.ui,
-                    pages::layout::frame_metrics(
-                        pages::layout::PaneKit::Single,
-                        self.account.width,
-                    ),
-                    &self.account,
-                    self.lang(),
-                )
-                .map(Message::Page),
-                agent::docked(&self.ui, &self.agent, self.width)
-                    .map(|element| element.map(Message::Agent)),
-                overlay,
-                self.options.force_state,
-                // M106：导航轨标签按当前界面语言取词。
-                self.lang(),
-            ),
+            // （树在 `app/view/account_page.rs`，与其它页共用 M104 的中栏可用宽）。
+            None if self.state.route() == &Route::Accounts => {
+                self.account_page(&account, background, overlay)
+            }
             // `Route::Agent`：独立页与右栏共用同一个 `conversation::view`（`agent::page` 内部调的它）。
-            None => shell::view_with_background(
+            None => shell::view_with_account(
                 &self.ui,
-                NavItem::Ai,
-                &account,
+                shell::NavRail {
+                    selected: NavItem::Ai,
+                    account: account.clone(),
+                },
                 APP_TITLE,
                 background,
                 agent::page(&self.ui, &self.agent, self.width).map(Message::Agent),
diff --git a/crates/app-iced/src/app/view/account_page.rs b/crates/app-iced/src/app/view/account_page.rs
new file mode 100644
index 0000000..c85fa03
--- /dev/null
+++ b/crates/app-iced/src/app/view/account_page.rs
@@ -0,0 +1,45 @@
+//! 账户页（M114）的**整页装配**：从 `App` 的状态拼出内容树，再交给外壳。
+//!
+//! 为什么单独一个文件：`app/view.rs` 贴着 400 行硬线（M104 的右栏分支已经把余量吃掉了），
+//! 而这段是纯装配（没有状态数学），搬出来不改变任何语义。
+//!
+//! 宽度口径：用 `AccountPage::width`（= M104 的 `AgentUi::content_width`，中栏可用宽），
+//! 与其它页、与 `refresh_view` 同一份来源——右栏展开时账户页**一起收缩**，不会顶到面板底下。
+
+use iced::Element;
+
+use crate::app::Message;
+use crate::pages;
+use crate::shell::{self, agent, NavItem, RailAccount};
+
+use super::super::state::App;
+use super::super::APP_TITLE;
+
+impl App {
+    /// 账户页（走 `pages::account` 自己的树，而不是 `pages::Screen` 那四页的 `Model`）。
+    pub(super) fn account_page<'a>(
+        &'a self,
+        account: &RailAccount,
+        background: Option<Element<'a, Message>>,
+        overlay: Option<Element<'a, Message>>,
+    ) -> Element<'a, Message> {
+        let metrics =
+            pages::layout::frame_metrics(pages::layout::PaneKit::Single, self.account.width);
+        shell::view_with_account(
+            &self.ui,
+            shell::NavRail {
+                selected: NavItem::Account,
+                account: account.clone(),
+            },
+            APP_TITLE,
+            background,
+            // M106：账户页的文案跟着**生效语言**走（早期钉死 `Lang::En` 的写法已删）。
+            pages::account::view(&self.ui, metrics, &self.account, self.lang()).map(Message::Page),
+            agent::docked(&self.ui, &self.agent, self.width)
+                .map(|element| element.map(Message::Agent)),
+            overlay,
+            self.options.force_state,
+            self.lang(),
+        )
+    }
+}
diff --git a/crates/app-iced/src/pages/account.rs b/crates/app-iced/src/pages/account.rs
index 0f58b42..7f55b4e 100644
--- a/crates/app-iced/src/pages/account.rs
+++ b/crates/app-iced/src/pages/account.rs
@@ -38,10 +38,10 @@ pub mod widgets;
 #[cfg(test)]
 mod tests;
 
-pub use model::{Form, Page, Panel, Track};
+pub use model::{Form, Hint, Notice, Page, Panel, Track};
 
-use iced::widget::{column, scrollable};
-use iced::{Element, Length};
+use iced::widget::{column, container, scrollable};
+use iced::{Element, Length, Padding};
 
 use unlucky_design::spacing::Space;
 use unlucky_i18n::{Key, Lang};
@@ -84,8 +84,12 @@ pub enum Message {
     Switch(String),
     /// 删除账户
     Remove(String),
-    /// 重新登录（微软轨 → 授权码流）
-    Relogin,
+    /// 重新登录（按账户类型分派：微软 → 授权码流；第三方 → 预填表单；离线 → 明确说明）
+    Relogin(String),
+    /// 展开/收起「Add an account」的三张轨道卡（复审 r1 P2-4）
+    ToggleAdd,
+    /// 关掉横幅
+    DismissNotice,
 }
 
 impl Message {
@@ -109,7 +113,7 @@ pub fn view<'a>(
         .subtitle(subtitle)
         .action(buttons::tonal(
             ui,
-            Button::new(add, Message::Open(Track::Microsoft).into_page()),
+            Button::new(add, Message::ToggleAdd.into_page()),
         ));
 
     let top = if page.rows.is_empty() {
@@ -131,17 +135,36 @@ pub fn view<'a>(
     };
 
     let mut content = column![].spacing(ui.space(Space::X6)).width(Length::Fill);
+    if let Some(notice) = &page.notice {
+        content = content.push(widgets::banner(ui, notice, text));
+    }
+    if let Some(hint) = page.hint {
+        content = content.push(widgets::hint(ui, hint, page, text));
+    }
+    // 三张轨道卡：空态**总是**画（那就是空态的入口）；有账号时收在「Add an account」后面
+    let show_tracks = page.panel == Panel::None && (page.rows.is_empty() || page.form.section_open);
     content = if page.panel == Panel::None {
-        content.push(top).push(flows)
+        if show_tracks {
+            content.push(top).push(flows)
+        } else {
+            content.push(top)
+        }
     } else {
         content.push(flows).push(top)
     };
 
+    // 右缘留 8px gutter：全局 `frame::scroll_style` 的滚动条是 6px + 2px 内缩，
+    // 满宽卡片会被它压住（tower 看图意见 ②）。页面级留白是这条的最小修法。
+    let padded = container(content).width(Length::Fill).padding(Padding {
+        right: ui.space(Space::X2),
+        ..Padding::default()
+    });
+
     frame::page(
         ui,
         metrics,
         header,
-        scrollable(content)
+        scrollable(padded)
             .style(frame::scroll_style(ui))
             .width(Length::Fill)
             .height(Length::Fill),
diff --git a/crates/app-iced/src/pages/account/avatar.rs b/crates/app-iced/src/pages/account/avatar.rs
index 5003eb3..d180dbe 100644
--- a/crates/app-iced/src/pages/account/avatar.rs
+++ b/crates/app-iced/src/pages/account/avatar.rs
@@ -83,24 +83,9 @@ fn decode(skin: &SkinImage) -> Avatar {
     let Some(decoded) = decode_png(&skin.png) else {
         return Avatar::default();
     };
-    let (width, height) = (decoded.width(), decoded.height());
-    // 旧版皮肤是 64×32：没有帽子层，只有脸
-    if width < FACE.0 + FACE_EDGE || height < FACE.1 + FACE_EDGE {
+    let Some(scaled) = compose_head(&decoded) else {
         return Avatar::default();
-    }
-    let mut face =
-        ::image::imageops::crop_imm(&decoded, FACE.0, FACE.1, FACE_EDGE, FACE_EDGE).to_image();
-    if width >= HAT.0 + FACE_EDGE && height >= HAT.1 + FACE_EDGE {
-        let hat =
-            ::image::imageops::crop_imm(&decoded, HAT.0, HAT.1, FACE_EDGE, FACE_EDGE).to_image();
-        ::image::imageops::overlay(&mut face, &hat, 0, 0);
-    }
-    let scaled = ::image::imageops::resize(
-        &face,
-        HEAD_PX,
-        HEAD_PX,
-        ::image::imageops::FilterType::Nearest,
-    );
+    };
     Avatar {
         head: Some(image::Handle::from_rgba(
             HEAD_PX,
@@ -112,6 +97,29 @@ fn decode(skin: &SkinImage) -> Avatar {
     }
 }
 
+/// 裁 8×8 脸 + 叠 (40,8) 的帽子层 + 放大到 64×64（纯函数，单测直接验像素）。
+///
+/// 旧版 64×32 皮肤没有帽子层（只有脸），所以尺寸不够时只裁脸。
+fn compose_head(decoded: &::image::RgbaImage) -> Option<::image::RgbaImage> {
+    let (width, height) = (decoded.width(), decoded.height());
+    if width < FACE.0 + FACE_EDGE || height < FACE.1 + FACE_EDGE {
+        return None;
+    }
+    let mut face =
+        ::image::imageops::crop_imm(decoded, FACE.0, FACE.1, FACE_EDGE, FACE_EDGE).to_image();
+    if width >= HAT.0 + FACE_EDGE && height >= HAT.1 + FACE_EDGE {
+        let hat =
+            ::image::imageops::crop_imm(decoded, HAT.0, HAT.1, FACE_EDGE, FACE_EDGE).to_image();
+        ::image::imageops::overlay(&mut face, &hat, 0, 0);
+    }
+    Some(::image::imageops::resize(
+        &face,
+        HEAD_PX,
+        HEAD_PX,
+        ::image::imageops::FilterType::Nearest,
+    ))
+}
+
 /// 解 PNG（尺寸上限与背景图那条守门同源：皮肤不该有超大图）。
 fn decode_png(bytes: &[u8]) -> Option<::image::RgbaImage> {
     const MAX_EDGE: u32 = 512;
@@ -164,6 +172,11 @@ mod tests {
         png_of(&skin)
     }
 
+    /// **帽子层真的叠进头像了**（复审 r1 P3-4：原用例只断言 `head.is_some()`，
+    /// 把 overlay 删掉也不会红）。
+    ///
+    /// 夹具：脸是纯红 (200,10,10,255)，帽子层是半透明蓝 (10,10,200,120)。
+    /// 叠上去之后头像像素必须**既不等于纯红、也不等于纯蓝**——那就是混合的结果。
     #[test]
     fn a_real_skin_becomes_a_head_with_the_hat_layer() {
         let avatar = decode(&SkinImage {
@@ -172,6 +185,17 @@ mod tests {
         });
         assert!(avatar.head.is_some(), "64×64 皮肤必须裁出头像");
         assert!(avatar.skin.is_some(), "皮肤预览要有原图");
+
+        let decoded = decode_png(&skin_bytes()).expect("解码夹具");
+        let head = compose_head(&decoded).expect("裁头");
+        let pixel = head.get_pixel(0, 0).0;
+        assert_ne!(pixel, [200, 10, 10, 255], "帽子层没叠上去（还是纯红）");
+        assert_ne!(
+            pixel,
+            [10, 10, 200, 120],
+            "帽子层把脸整个盖掉了（不是 blend）"
+        );
+        assert!(pixel[2] > 10, "蓝色分量必须被帽子层抬高：{pixel:?}");
     }
 
     #[test]
diff --git a/crates/app-iced/src/pages/account/forms.rs b/crates/app-iced/src/pages/account/forms.rs
index 2a754ce..0e514b0 100644
--- a/crates/app-iced/src/pages/account/forms.rs
+++ b/crates/app-iced/src/pages/account/forms.rs
@@ -25,22 +25,13 @@ use crate::pages::Message as PageMessage;
 
 use super::{login, widgets, Message as Account};
 
-/// 空态：不是一张白页——标题 + 说明 + **三条轨道的直达入口**。
+/// 空态：不是一张白页——图标块 + 标题 + 说明，下面紧跟**三张轨道卡**（真正的入口）。
+///
+/// 复审 r1 的 P2-4：空态原先有**三套**同一件事的入口（右上按钮 / 三个 chip / 三张卡），
+/// chip 还被当成操作按钮用。现在只剩「右上 Add an account（展开/收起）+ 三张卡」这一套：
+/// 空态时卡片本来就可见，有账号时收在按钮后面。
 pub fn empty<'a>(ui: &'a Ui, catalog: Catalog, lang: Lang) -> Element<'a, PageMessage> {
-    let mut actions = row![]
-        .spacing(ui.space(Space::X2))
-        .align_y(Alignment::Center);
-    for track in Track::ALL {
-        // 三个按钮各用**轨道的名字**做标签（三条都叫「登录」的话，用户分不清点哪个）
-        actions = actions.push(buttons::tonal(
-            ui,
-            Button::new(
-                catalog.text(track.title_key()),
-                Account::Open(track).into_page(),
-            ),
-        ));
-    }
-
+    let _ = lang;
     let state = empty_state(
         ui,
         EmptyState::new(
@@ -49,17 +40,10 @@ pub fn empty<'a>(ui: &'a Ui, catalog: Catalog, lang: Lang) -> Element<'a, PageMe
             catalog.text(Key::AccountEmptyBody),
         ),
     );
-    let _ = lang;
-    column![
-        container(state).height(Length::Fixed(ui.space(Space::X8) * 8.0)),
-        container(actions)
-            .width(Length::Fill)
-            .align_x(Alignment::Center)
-            .center_x(Length::Fill),
-    ]
-    .spacing(ui.space(Space::X4))
-    .width(Length::Fill)
-    .into()
+    container(state)
+        .height(Length::Fixed(ui.space(Space::X8) * 8.0))
+        .width(Length::Fill)
+        .into()
 }
 
 /// 三条轨道的入口卡（面板没打开时画这一排）。
@@ -288,13 +272,25 @@ fn status_line<'a>(ui: &'a Ui, page: &'a Page, catalog: Catalog) -> Element<'a,
             catalog.render(Key::AccountServerOk, &[("server", server_name.as_str())]),
             ui.color(Role::Primary),
         ),
-        AuthlibPanel::Failed { message } => frame::text_role(
-            ui,
-            TypeRole::LabelMedium,
-            false,
-            message,
-            ui.color(Role::Error),
-        ),
+        // 失败只画**原因码对应的 i18n** + 一行 Code（原文是中文诊断串，上屏就是语言泄漏）
+        AuthlibPanel::Failed { failure, .. } => column![
+            frame::text_role(
+                ui,
+                TypeRole::LabelMedium,
+                false,
+                catalog.text(super::login::failure_body_key(*failure)),
+                ui.color(Role::Error),
+            ),
+            frame::text_role_owned(
+                ui,
+                TypeRole::LabelSmall,
+                false,
+                catalog.render(Key::AccountFailureCode, &[("code", failure.code())]),
+                ui.color(Role::Error),
+            ),
+        ]
+        .spacing(ui.space(Space::X1))
+        .into(),
         AuthlibPanel::Succeeded { name } => frame::text_role(
             ui,
             TypeRole::LabelMedium,
diff --git a/crates/app-iced/src/pages/account/login.rs b/crates/app-iced/src/pages/account/login.rs
index eccb9a9..43b9a6e 100644
--- a/crates/app-iced/src/pages/account/login.rs
+++ b/crates/app-iced/src/pages/account/login.rs
@@ -6,14 +6,14 @@
 //! 更不知道已经过期了——M114 把这三件事都做成可见状态：用户码（可复制）、链接（可复制/打开）、
 //! 倒计时（`{secs}s left`）与过期后的「已过期，重试」。授权码流同理，另外必须能**取消**。
 
-use iced::widget::{column, container, row};
-use iced::{Alignment, Background, Border, Element, Length};
+use iced::widget::{column, row};
+use iced::{Alignment, Element};
 
 use unlucky_design::color::Role;
-use unlucky_design::shape::ShapeScale;
 use unlucky_design::spacing::Space;
 use unlucky_design::typography::TypeRole;
 use unlucky_i18n::{Catalog, Key};
+use unlucky_presenter::dto::LoginFailure;
 
 use crate::app::components::buttons::{self, Button};
 use crate::pages::frame;
@@ -46,7 +46,7 @@ pub fn panel<'a>(
             expired,
             ..
         } => browser(ui, link, *remaining, *expired, catalog),
-        DevicePanel::Failed { message } => failed(ui, message, catalog),
+        DevicePanel::Failed { failure, .. } => failed(ui, *failure, catalog),
         DevicePanel::Succeeded { name } => succeeded(ui, name, catalog),
     }
 }
@@ -82,14 +82,16 @@ fn idle<'a>(ui: &'a Ui, catalog: Catalog) -> Element<'a, PageMessage> {
     frame::card(ui, body)
 }
 
-/// 「正在申请/正在校验」：一句状态 + 取消。
-fn notice<'a>(ui: &'a Ui, message: &'a str, catalog: Catalog) -> Element<'a, PageMessage> {
+/// 「正在申请/正在校验」：一句**i18n**状态 + 取消。
+///
+/// 不复读 presenter 的 `message`：那是后端诊断串（中文），上屏就是语言泄漏（复审 r1 P1-1）。
+fn notice<'a>(ui: &'a Ui, _message: &str, catalog: Catalog) -> Element<'a, PageMessage> {
     let body = column![
         frame::text_role(
             ui,
             TypeRole::BodyMedium,
             false,
-            message,
+            catalog.text(Key::AccountDeviceRequesting),
             ui.color(Role::OnSurfaceVariant),
         ),
         row![buttons::text(
@@ -261,8 +263,12 @@ fn countdown_line<'a>(
         );
     }
     let text = remaining.map_or_else(String::new, |secs| {
-        catalog.render(Key::AccountDeviceCountdown, &[("secs", &secs.to_string())])
+        // mm:ss（`15:00 left`）而不是 `900s left`：人读的是分秒，而且不随语言换格式
+        // （数字与冒号在两种语言里同形，只有 `left`/`剩` 走 catalog）。
+        let clock = format!("{:02}:{:02}", secs / 60, secs % 60);
+        catalog.render(Key::AccountDeviceCountdown, &[("time", &clock)])
     });
+    // 运行时格式化的串走 `text_role_owned`（`text_role` 只借 `&'a str`）
     frame::text_role_owned(
         ui,
         TypeRole::LabelMedium,
@@ -272,56 +278,39 @@ fn countdown_line<'a>(
     )
 }
 
-/// 失败态（`ErrorContainer` 面板：不是一句灰字）。
-fn failed<'a>(ui: &'a Ui, message: &'a str, catalog: Catalog) -> Element<'a, PageMessage> {
-    let body = column![
-        frame::text_role(
+/// 失败态：**M3 内联 alert**（左侧 `ErrorContainer` 图标块 + 标题/正文/Code + 重试/关闭）。
+///
+/// 两条修订叠在这里：
+/// - **语言泄漏（r1 p1）**：只画原因码对应的 i18n + 一行 `Code: …`，后端中文原文不上屏；
+/// - **不许通栏实心红（tower r2）**：面板底走 `SurfaceContainerHigh` + 描边，
+///   `ErrorContainer`/`OnErrorContainer` 只作左侧图标块的强调（角色不变，面积收小）。
+fn failed<'a>(ui: &'a Ui, failure: LoginFailure, catalog: Catalog) -> Element<'a, PageMessage> {
+    let body = catalog.text(failure_body_key(failure)).to_string();
+    let code = catalog.render(Key::AccountFailureCode, &[("code", failure.code())]);
+    let actions = vec![
+        buttons::tonal(
             ui,
-            TypeRole::TitleSmall,
-            true,
-            catalog.text(Key::AccountLoginFailed),
-            ui.color(Role::OnErrorContainer),
+            Button::new(
+                catalog.text(Key::AccountDeviceRetry),
+                Account::StartDevice.into_page(),
+            ),
         ),
-        frame::text_role(
+        buttons::text(
             ui,
-            TypeRole::BodyMedium,
-            false,
-            message,
-            ui.color(Role::OnErrorContainer),
+            Button::new(
+                catalog.text(Key::AccountDialogClose),
+                Account::Close.into_page(),
+            ),
         ),
-        row![
-            buttons::tonal(
-                ui,
-                Button::new(
-                    catalog.text(Key::AccountDeviceRetry),
-                    Account::StartDevice.into_page(),
-                )
-            ),
-            buttons::text(
-                ui,
-                Button::new(
-                    catalog.text(Key::AccountDialogClose),
-                    Account::Close.into_page()
-                )
-            ),
-        ]
-        .spacing(ui.space(Space::X2))
-        .align_y(Alignment::Center),
-    ]
-    .spacing(ui.space(Space::X3));
-
-    container(body)
-        .width(Length::Fill)
-        .padding(ui.metrics().card_padding)
-        .style(move |_theme| container::Style {
-            background: Some(Background::Color(ui.color(Role::ErrorContainer))),
-            border: Border {
-                radius: ui.radius_dp(ShapeScale::Medium),
-                ..Border::default()
-            },
-            ..container::Style::default()
-        })
-        .into()
+    ];
+    super::widgets::alert(
+        ui,
+        super::widgets::Tone::Error,
+        catalog.text(Key::AccountLoginFailed),
+        body,
+        Some(code),
+        actions,
+    )
 }
 
 /// 成功态。
@@ -347,3 +336,17 @@ fn succeeded<'a>(ui: &'a Ui, name: &'a str, catalog: Catalog) -> Element<'a, Pag
     .spacing(ui.space(Space::X3));
     frame::card(ui, body)
 }
+
+/// 原因码 → i18n 正文 key（页面里唯一的「码→文案」映射点）。
+pub(super) fn failure_body_key(failure: LoginFailure) -> Key {
+    match failure {
+        LoginFailure::Denied => Key::AccountFailureDenied,
+        LoginFailure::NotWhitelisted => Key::AccountFailureWhitelist,
+        LoginFailure::Unreachable => Key::AccountFailureUnreachable,
+        LoginFailure::NotAuthlibServer => Key::AccountFailureNotAuthlib,
+        LoginFailure::BadCredentials => Key::AccountFailureBadCredentials,
+        LoginFailure::NoProfile => Key::AccountFailureNoProfile,
+        LoginFailure::StoreFailed => Key::AccountFailureStore,
+        LoginFailure::Other => Key::AccountFailureOther,
+    }
+}
diff --git a/crates/app-iced/src/pages/account/model.rs b/crates/app-iced/src/pages/account/model.rs
index 1820750..16145f1 100644
--- a/crates/app-iced/src/pages/account/model.rs
+++ b/crates/app-iced/src/pages/account/model.rs
@@ -7,7 +7,7 @@
 use iced::widget::image;
 
 use unlucky_i18n::{Key, Lang};
-use unlucky_presenter::dto::{AccountKind, AccountView};
+use unlucky_presenter::dto::{AccountKind, AccountNotice, AccountNoticeCode, AccountView};
 use unlucky_presenter::state::AppState;
 
 use super::avatar::{Avatar, Cache};
@@ -79,7 +79,23 @@ pub enum Panel {
 ///
 /// 密码只存在这里和「一次 `AppCommand::AddAuthlibAccount` 的载荷」里：不进日志、不进快照、
 /// 不进任何回程 DTO（M114 凭据红线）。
-#[derive(Debug, Clone, Default, PartialEq, Eq)]
+/// **手写 `Debug`**：`Form` 里持着一次性密码，任何 `{:?}` 都不许带出明文（凭据红线）。
+impl std::fmt::Debug for Form {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("Form")
+            .field("panel", &self.panel)
+            .field("server", &self.server)
+            .field("login", &self.login)
+            .field("password", &"⟪redacted⟫")
+            .field("offline_name", &self.offline_name)
+            .field("section_open", &self.section_open)
+            .field("hint", &self.hint)
+            .finish()
+    }
+}
+
+/// 三条轨道的表单输入（纯 UI 状态；密码是**一次性请求值**）。
+#[derive(Clone, Default, PartialEq, Eq)]
 pub struct Form {
     /// 当前面板
     pub panel: Panel,
@@ -91,6 +107,19 @@ pub struct Form {
     pub password: String,
     /// 本地档案名
     pub offline_name: String,
+    /// 「Add an account」展开态（有账号时三张轨道卡默认收起，复审 r1 P2-4）
+    pub section_open: bool,
+    /// 一次性引导（重新登录时告诉用户下一步；`None` = 没有引导）
+    pub hint: Option<Hint>,
+}
+
+/// 一次性引导（由 app 层在「重新登录」时设置，页面画一行 i18n）。
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Hint {
+    /// 第三方轨重登：重新输入密码
+    AuthlibReauth,
+    /// 本地档案没有可重登的服务器账户
+    OfflineNoRelogin,
 }
 
 impl Form {
@@ -111,6 +140,7 @@ impl Form {
     /// 关掉面板（**密码一起清掉**：留着没有意义，只是多留一份凭据在内存里）。
     pub fn close(&mut self) {
         self.password.clear();
+        self.hint = None;
         self.panel = Panel::None;
     }
 
@@ -179,10 +209,35 @@ pub struct Page {
     /// 版面宽度（**中栏可用宽**，M104 的 `AgentUi::content_width`；账户页自己的
     /// `layout::frame_metrics` 拿它算列宽，与其它页同源）
     pub width: f32,
+    /// 账户页横幅（添加/删除/切换的结果；`None` = 不画）
+    pub notice: Option<Notice>,
+    /// 一次性引导（重新登录的下一步）
+    pub hint: Option<Hint>,
+}
+
+/// 横幅的渲染数据（文案在视图层按 `code` 查 i18n）。
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Notice {
+    /// 结果码
+    pub code: AccountNoticeCode,
+    /// 主题（账户名/服务器地址）
+    pub subject: String,
+    /// 是否失败（决定配色）
+    pub failure: bool,
+}
+
+impl Notice {
+    fn of(notice: &AccountNotice) -> Self {
+        Self {
+            code: notice.code,
+            subject: notice.subject.clone(),
+            failure: notice.code.is_failure(),
+        }
+    }
 }
 
 impl Page {
-    /// 从状态与表单构造（`avatars` 是解码缓存，见 [`Cache]`；`width` 是中栏可用宽）。
+    /// 从状态与表单构造（`avatars` 是解码缓存，见 [`Cache`]；`width` 是中栏可用宽）。
     pub fn build(
         state: &AppState,
         form: &Form,
@@ -222,6 +277,8 @@ impl Page {
             device,
             authlib,
             checked_server,
+            notice: state.account_notice.as_ref().map(Notice::of),
+            hint: form.hint,
             width,
         }
     }
diff --git a/crates/app-iced/src/pages/account/panels.rs b/crates/app-iced/src/pages/account/panels.rs
index cd6a9e8..fd27a8f 100644
--- a/crates/app-iced/src/pages/account/panels.rs
+++ b/crates/app-iced/src/pages/account/panels.rs
@@ -3,7 +3,7 @@
 //! 从 `model.rs` 拆出来守 400 行硬线：这些类型是「UI 要画什么」的枚举，
 //! 判定逻辑（倒计时 → 已过期、服务发现 → 可用）也在这里，页面与表单只消费结果。
 
-use unlucky_presenter::dto::{DeviceLoginPhase, DeviceLoginView};
+use unlucky_presenter::dto::{AuthlibLoginView, DeviceLoginPhase, DeviceLoginView, LoginFailure};
 
 /// 微软登录面板要画什么（每态都不同，**不允许只有一个转圈**）。
 #[derive(Debug, Clone, PartialEq, Eq)]
@@ -39,10 +39,12 @@ pub enum DevicePanel {
         /// 状态文案
         message: String,
     },
-    /// 失败（原文已脱敏）
+    /// 失败（**原因码上屏，原文只进日志**）
     Failed {
-        /// 失败原因
-        message: String,
+        /// 原因码（页面据此选 i18n）
+        failure: LoginFailure,
+        /// 原始诊断（不上屏）
+        detail: String,
     },
     /// 成功
     Succeeded {
@@ -68,10 +70,12 @@ pub enum AuthlibPanel {
         /// 状态文案
         message: String,
     },
-    /// 失败（原文已脱敏）
+    /// 失败（**原因码上屏，原文只进日志**）
     Failed {
-        /// 失败原因
-        message: String,
+        /// 原因码（页面据此选 i18n）
+        failure: LoginFailure,
+        /// 原始诊断（不上屏）
+        detail: String,
     },
     /// 成功
     Succeeded {
@@ -107,7 +111,8 @@ pub(super) fn device_panel(view: &DeviceLoginView, remaining: Option<u64>) -> De
             }
         }
         DeviceLoginPhase::Failed => DevicePanel::Failed {
-            message: view.message.clone(),
+            failure: view.failure.unwrap_or(LoginFailure::Other),
+            detail: view.message.clone(),
         },
         DeviceLoginPhase::Succeeded => DevicePanel::Succeeded {
             name: view.account_name.clone(),
@@ -116,9 +121,7 @@ pub(super) fn device_panel(view: &DeviceLoginView, remaining: Option<u64>) -> De
 }
 
 /// 第三方轨状态 → 面板态（顺带取出「校验通过的服务器名」）。
-pub(super) fn authlib_panel(
-    view: &unlucky_presenter::dto::AuthlibLoginView,
-) -> (AuthlibPanel, String) {
+pub(super) fn authlib_panel(view: &AuthlibLoginView) -> (AuthlibPanel, String) {
     match view.phase {
         DeviceLoginPhase::Idle => (AuthlibPanel::Idle, String::new()),
         DeviceLoginPhase::Requesting => (
@@ -142,7 +145,8 @@ pub(super) fn authlib_panel(
         ),
         DeviceLoginPhase::Failed => (
             AuthlibPanel::Failed {
-                message: view.message.clone(),
+                failure: view.failure.unwrap_or(LoginFailure::Other),
+                detail: view.message.clone(),
             },
             String::new(),
         ),
diff --git a/crates/app-iced/src/pages/account/rows.rs b/crates/app-iced/src/pages/account/rows.rs
index 6c4f2f5..9e29ede 100644
--- a/crates/app-iced/src/pages/account/rows.rs
+++ b/crates/app-iced/src/pages/account/rows.rs
@@ -36,7 +36,7 @@ pub fn active_card<'a>(
         ui,
         Button::new(
             catalog.text(Key::AccountRelogin),
-            Account::Relogin.into_page(),
+            Account::Relogin(current.id.clone()).into_page(),
         ),
     ));
     actions = actions.push(buttons::text(
@@ -67,7 +67,7 @@ pub fn active_card<'a>(
         ));
     }
 
-    let identity = column![
+    let mut identity = column![
         name_line,
         frame::text_role(
             ui,
@@ -78,6 +78,16 @@ pub fn active_card<'a>(
         ),
     ]
     .spacing(ui.space(Space::X1));
+    // 与列表行同源：服务器地址 / 登录名这一行两边都要有（tower 看图意见 ①）
+    if !current.detail.is_empty() {
+        identity = identity.push(frame::text_role(
+            ui,
+            TypeRole::BodySmall,
+            false,
+            &current.detail,
+            ui.color(Role::OnSurfaceVariant),
+        ));
+    }
 
     let left = row![
         widgets::avatar(ui, current, widgets::AVATAR_ACTIVE),
@@ -93,13 +103,44 @@ pub fn active_card<'a>(
     ]
     .spacing(ui.space(Space::X4));
 
-    if let Some(skin) = page.active_skin() {
-        body = body.push(skin_preview(ui, skin.clone(), catalog));
+    match page.active_skin() {
+        Some(skin) => body = body.push(skin_preview(ui, skin.clone(), catalog)),
+        // 没有皮肤就**说出来**（离线轨永远没有；第三方轨没抓到也是这句），别让用户猜
+        None => body = body.push(skin_absent(ui, catalog)),
     }
 
     frame::card(ui, body)
 }
 
+/// 无皮肤时的皮肤区：一句话说清「没有可用皮肤」，与皮肤预览区同一位置、同一节奏。
+fn skin_absent<'a>(ui: &'a Ui, catalog: Catalog) -> Element<'a, PageMessage> {
+    column![
+        frame::text_role(
+            ui,
+            TypeRole::LabelMedium,
+            true,
+            catalog.text(Key::AccountSkinTitle),
+            ui.color(Role::OnSurface),
+        ),
+        frame::text_role(
+            ui,
+            TypeRole::BodySmall,
+            false,
+            catalog.text(Key::AccountSkinNone),
+            ui.color(Role::OnSurfaceVariant),
+        ),
+        frame::text_role(
+            ui,
+            TypeRole::BodySmall,
+            false,
+            catalog.text(Key::AccountSkinHint),
+            ui.color(Role::OnSurfaceVariant),
+        ),
+    ]
+    .spacing(ui.space(Space::X1))
+    .into()
+}
+
 /// 皮肤预览区：**原图直出**（64×64），旁边一句话说清「皮肤从哪来」。
 fn skin_preview<'a>(
     ui: &'a Ui,
diff --git a/crates/app-iced/src/pages/account/tests.rs b/crates/app-iced/src/pages/account/tests.rs
index 20a595e..4c3aaa1 100644
--- a/crates/app-iced/src/pages/account/tests.rs
+++ b/crates/app-iced/src/pages/account/tests.rs
@@ -3,20 +3,21 @@
 //! | 用例 | 抓得住什么 |
 //! |---|---|
 //! | `a_jwt_injected_into_events_never_reaches_the_page` | **凭据红线**：DTO → 状态 → 视图模型这一路漏了脱敏 |
+//! | `a_failure_with_a_provider_code_renders_english_and_the_code` | **语言泄漏（r1 p1）**：后端中文诊断串又直接上屏了 |
 //! | `an_empty_account_list_offers_all_three_tracks` | 空态变成白页（没有入口） |
-//! | `the_device_code_panel_shows_a_countdown_and_expires` | 设备码「只转圈」（倒计时/过期不可见） |
+//! | `the_device_code_panel_shows_a_countdown_and_expires` | 设备码「只转圈」/ 倒计时不是人话格式 |
 //! | `a_third_party_account_falls_back_to_the_monogram` | 没有皮肤却画白块 / 拿假皮肤充数 |
-//! | `the_offline_track_keeps_the_agreed_wording` | 离线档案的说明被改写成「兼容旧启动器」那套 |
 
 use unlucky_i18n::{Key, Lang};
 use unlucky_presenter::dto::{
-    AccountKind, AccountView, AppEvent, AuthlibLoginView, CoreEvent, DeviceLoginPhase,
-    DeviceLoginView, SkinImage,
+    AccountKind, AccountNotice, AccountNoticeCode, AccountView, AppEvent, AuthlibLoginView,
+    CoreEvent, DeviceLoginPhase, DeviceLoginView, LoginFailure, SkinImage,
 };
 use unlucky_presenter::state::AppState;
 
 use super::avatar::Cache;
-use super::model::{AuthlibPanel, DevicePanel, Form, Page, Panel, Track};
+use super::login::failure_body_key;
+use super::model::{AuthlibPanel, DevicePanel, Form, Hint, Page, Panel, Track};
 
 fn account(name: &str, kind: AccountKind, active: bool) -> AccountView {
     AccountView {
@@ -33,11 +34,14 @@ fn account(name: &str, kind: AccountKind, active: bool) -> AccountView {
 }
 
 fn build(state: &AppState, form: &Form) -> Page {
-    Page::build(state, form, &mut Cache::default(), Lang::ZhCn, 1180.0)
+    // 断言口径是英文界面（app 钉死 `Lang::En`）：英文目录下「视图里有中文」=「后端原文上屏了」。
+    // 宽度取验收窗口 1180（r2 起 `Page` 记中栏可用宽）。
+    Page::build(state, form, &mut Cache::default(), Lang::En, 1180.0)
 }
 
-/// 把视图模型里**所有会上屏的文本**拼起来（凭据红线就是在这坨里查）。
-fn visible_text(page: &Page) -> String {
+/// 页面**会画什么**：模型里的数据 + 视图层对码的 i18n 查表结果。
+fn on_screen(page: &Page) -> String {
+    let catalog = Lang::En.catalog();
     let mut out = String::new();
     for row in &page.rows {
         out.push_str(&row.name);
@@ -46,64 +50,91 @@ fn visible_text(page: &Page) -> String {
         out.push_str(&row.added);
         out.push_str(&row.detail);
     }
-    out.push_str(&page.form.server);
-    out.push_str(&page.form.login);
     out.push_str(&page.form.offline_name);
-    out.push_str(&page.checked_server);
+    out.push_str(&page.form.server);
+    if let Some(notice) = &page.notice {
+        // 与 `widgets::banner` 同源：码 → i18n（主题名拼进去）
+        out.push_str(match notice.code {
+            AccountNoticeCode::OfflineNameInvalid => {
+                catalog.text(Key::AccountNoticeOfflineNameInvalid)
+            }
+            AccountNoticeCode::AccountExists => catalog.text(Key::AccountNoticeAccountExists),
+            AccountNoticeCode::StoreFailed => catalog.text(Key::AccountNoticeStoreFailed),
+            AccountNoticeCode::NotFound => catalog.text(Key::AccountNoticeNotFound),
+            AccountNoticeCode::Other => catalog.text(Key::AccountNoticeOther),
+            AccountNoticeCode::Added => catalog.text(Key::AccountNoticeAdded),
+            AccountNoticeCode::Removed => catalog.text(Key::AccountNoticeRemoved),
+            AccountNoticeCode::Switched => catalog.text(Key::AccountNoticeSwitched),
+        });
+        out.push_str(&notice.subject);
+    }
+    if let Some(hint) = page.hint {
+        out.push_str(match hint {
+            Hint::AuthlibReauth => catalog.text(Key::AccountHintAuthlibReauth),
+            Hint::OfflineNoRelogin => catalog.text(Key::AccountHintOfflineNoRelogin),
+        });
+    }
     match &page.device {
         DevicePanel::Hidden => {}
-        DevicePanel::Requesting { message } => out.push_str(message),
+        DevicePanel::Requesting { .. } => out.push_str(catalog.text(Key::AccountDeviceRequesting)),
         DevicePanel::Code {
             code,
             link,
-            message,
+            remaining,
+            expired,
             ..
         } => {
             out.push_str(code);
             out.push_str(link);
-            out.push_str(message);
+            if *expired {
+                out.push_str(catalog.text(Key::AccountDeviceExpired));
+            } else if let Some(secs) = remaining {
+                let clock = format!("{:02}:{:02}", secs / 60, secs % 60);
+                out.push_str(&catalog.render(Key::AccountDeviceCountdown, &[("time", &clock)]));
+            }
         }
-        DevicePanel::Browser { link, message, .. } => {
-            out.push_str(link);
-            out.push_str(message);
+        DevicePanel::Browser { link, .. } => out.push_str(link),
+        DevicePanel::Failed { failure, .. } => {
+            out.push_str(catalog.text(failure_body_key(*failure)));
+            out.push_str(&catalog.render(Key::AccountFailureCode, &[("code", failure.code())]));
         }
-        DevicePanel::Failed { message } => out.push_str(message),
         DevicePanel::Succeeded { name } => out.push_str(name),
     }
     match &page.authlib {
         AuthlibPanel::Idle => {}
-        AuthlibPanel::Running { message } => out.push_str(message),
-        AuthlibPanel::Ready {
-            server_name,
-            message,
-        } => {
-            out.push_str(server_name);
-            out.push_str(message);
+        AuthlibPanel::Running { .. } => out.push_str(catalog.text(Key::AccountServerChecking)),
+        AuthlibPanel::Ready { server_name, .. } => out.push_str(server_name),
+        AuthlibPanel::Failed { failure, .. } => {
+            out.push_str(catalog.text(failure_body_key(*failure)));
+            out.push_str(failure.code());
         }
-        AuthlibPanel::Failed { message } => out.push_str(message),
         AuthlibPanel::Succeeded { name } => out.push_str(name),
     }
     out
 }
 
+/// 有没有中日韩统一表意文字（语言泄漏的最直接判据）。
+fn has_cjk(text: &str) -> bool {
+    text.chars().any(|c| matches!(c, '\u{3400}'..='\u{4DBF}' | '\u{4E00}'..='\u{9FFF}' | '\u{3000}'..='\u{303F}' | '\u{FF00}'..='\u{FFEF}'))
+}
+
 const JWT: &str =
     "eyJhbGciOiJSUzI1NiIsIng1dCI6IkFCQyJ9.eyJzdWIiOiIxMjM0NTY3ODkwIn0.c2lnbmF0dXJlLXZhbHVl";
 
-/// **凭据红线（审核项）**：把 JWT 形状串注入事件 → 视图模型里不许出现。
+/// **凭据红线（审核项）**：把 JWT 形状串注入事件 → 状态与视图模型里都不许出现。
 ///
 /// 抓得住：presenter 状态层的脱敏被删（`AppState::apply_device_login` / `apply_authlib_login`），
 /// 或页面把 DTO 的错误原文直接搬上屏。
-/// 抓不住：某个将来新增的**独立**字段绕过 `message` 通道（那需要另加断言）。
 #[test]
 fn a_jwt_injected_into_events_never_reaches_the_page() {
     let mut state = AppState::new();
     state.accounts = vec![account("Steve", AccountKind::Microsoft, true)];
     // **绕过构造器**直接摆一个带 JWT 的 DTO：模拟「将来某个新构造器忘了脱敏」/「后端把原文塞进来」。
-    // 用 `DeviceLoginView::failed(..)` 构造是测不到状态层脱敏的（构造器自己就脱过了）。
     state.apply(AppEvent::Core(CoreEvent::DeviceLoginChanged(
         DeviceLoginView {
             phase: DeviceLoginPhase::Failed,
             message: format!("微软返回错误：accessToken={JWT} refresh_token={JWT}"),
+            failure: Some(LoginFailure::Denied),
             ..DeviceLoginView::new()
         },
     )));
@@ -113,21 +144,75 @@ fn a_jwt_injected_into_events_never_reaches_the_page() {
             server: "https://littleskin.cn/api/yggdrasil/".to_string(),
             server_name: String::new(),
             message: format!("服务器回包异常 {JWT}"),
+            failure: Some(LoginFailure::Denied),
             account_name: String::new(),
         },
     )));
 
-    let page = build(&state, &Form::new());
-    let text = visible_text(&page);
-    assert!(!text.contains("eyJ"), "视图模型里出现了 JWT：{text}");
-    assert!(!text.to_lowercase().contains("refreshtoken"), "{text}");
+    // ① 状态层已经脱敏（这一条抓得住「摘掉 state 层 redact」的变异）
     assert!(
-        text.contains("⟪redacted⟫"),
-        "错误文案要被标成已脱敏：{text}"
+        !state.device_login.message.contains("eyJ"),
+        "{}",
+        state.device_login.message
     );
+    assert!(
+        !state.authlib_login.message.contains("eyJ"),
+        "{}",
+        state.authlib_login.message
+    );
+
+    // ② 上屏文案更不可能有它（页面根本不画原文）
+    let text = on_screen(&build(&state, &Form::new()));
+    assert!(!text.contains("eyJ"), "视图里出现了 JWT：{text}");
+    assert!(!text.contains("⟪redacted⟫"), "脱敏占位符也不该上屏：{text}");
 }
 
-/// 空态：**三条轨道都有入口**，不是一张白页。
+/// **语言泄漏（复审 r1 p1）**：带 AADSTS 码的失败事件 → 英文视图里不许有中文，且要带 code。
+///
+/// 抓得住：有人又把 `view.message`（core 的中文诊断串）画回面板上；或者码→i18n 的映射被摘。
+/// 抓不住：catalog 里某条英文译文本身写得差（那只能人工审）。
+#[test]
+fn a_failure_with_a_provider_code_renders_english_and_the_code() {
+    let mut state = AppState::new();
+    state.apply(AppEvent::Core(CoreEvent::DeviceLoginChanged(
+        DeviceLoginView {
+            phase: DeviceLoginPhase::Failed,
+            message:
+                "微软拒绝了这次登录：AADSTS7000218（HTTP 403）—— 应用白名单还没批准，或网络被拦截"
+                    .to_string(),
+            failure: Some(LoginFailure::NotWhitelisted),
+            ..DeviceLoginView::new()
+        },
+    )));
+    let page = build(&state, &Form::new());
+    let text = on_screen(&page);
+    assert!(!has_cjk(&text), "英文界面里出现了中文：{text}");
+    assert!(
+        text.contains("whitelist_pending"),
+        "面板要给稳定 code：{text}"
+    );
+    assert!(
+        text.to_lowercase().contains("approved"),
+        "要给出可读的英文原因：{text}"
+    );
+
+    // 第三方轨的失败同样只有 i18n + code
+    state.apply(AppEvent::Core(CoreEvent::AuthlibLoginChanged(
+        AuthlibLoginView {
+            phase: DeviceLoginPhase::Failed,
+            server: "https://example.invalid/".to_string(),
+            server_name: String::new(),
+            message: "服务器不可达：dns error".to_string(),
+            failure: Some(LoginFailure::Unreachable),
+            account_name: String::new(),
+        },
+    )));
+    let text = on_screen(&build(&state, &Form::new()));
+    assert!(!has_cjk(&text), "{text}");
+    assert!(text.contains("unreachable"), "{text}");
+}
+
+/// 空态：**三条轨道都有入口**，不是一张白页；且三张卡的标题各不相同。
 #[test]
 fn an_empty_account_list_offers_all_three_tracks() {
     let state = AppState::new();
@@ -135,8 +220,6 @@ fn an_empty_account_list_offers_all_three_tracks() {
     assert!(page.is_empty());
     assert_eq!(page.panel, Panel::None);
     assert!(page.active_row().is_none());
-    assert_eq!(Track::ALL.len(), 3);
-    // 三条轨道的文案 key 各不相同（不是三张一样的卡）
     let mut keys: Vec<&str> = Track::ALL
         .iter()
         .map(|track| track.title_key().name())
@@ -146,7 +229,7 @@ fn an_empty_account_list_offers_all_three_tracks() {
     assert_eq!(keys.len(), 3);
 }
 
-/// 设备码：**倒计时可见**，过期后是「已过期」而不是继续转圈。
+/// 设备码：**倒计时是人话格式（mm:ss）**，过期后是「已过期」而不是继续转圈。
 #[test]
 fn the_device_code_panel_shows_a_countdown_and_expires() {
     let mut state = AppState::new();
@@ -162,11 +245,14 @@ fn the_device_code_panel_shows_a_countdown_and_expires() {
             ..
         } => {
             assert_eq!(code, "ABCD-EFGH");
-            assert!(remaining.is_some_and(|secs| secs > 0));
+            assert_eq!(*remaining, Some(900));
             assert!(!expired);
         }
         other => panic!("等待态应该是设备码面板，实际 {other:?}"),
     }
+    let text = on_screen(&page);
+    assert!(text.contains("15:00"), "倒计时要画成 mm:ss：{text}");
+    assert!(!text.contains("900s"), "不再是 `900s left`：{text}");
 
     // 起点往前挪 20 分钟 ⇒ 过期
     state.device_login_started =
@@ -190,7 +276,7 @@ fn the_device_code_panel_shows_a_countdown_and_expires() {
     assert!(matches!(page.device, DevicePanel::Browser { .. }));
 }
 
-/// 没有皮肤 = 首字母块（不是白块、不是假皮肤）；坏图也必须回落。
+/// 没有皮肤 = 首字母块（不是白块、不是假皮肤）；坏图也必须回落；无皮肤时**明说**。
 #[test]
 fn a_third_party_account_falls_back_to_the_monogram() {
     let mut state = AppState::new();
@@ -204,7 +290,9 @@ fn a_third_party_account_falls_back_to_the_monogram() {
         "没有皮肤就不许有图"
     );
     assert!(page.rows.iter().all(|row| !row.monogram.is_empty()));
-    assert!(page.active_skin().is_none(), "皮肤预览区没有图就不画");
+    assert!(page.active_skin().is_none(), "皮肤预览区没有图就不画图");
+    let text = on_screen(&page);
+    assert!(!has_cjk(&text));
 
     // 塞一张坏图：解码失败 → 仍然回落到首字母块（不 panic、不白块）
     state.accounts[0].skin = Some(SkinImage {
@@ -213,12 +301,6 @@ fn a_third_party_account_falls_back_to_the_monogram() {
     });
     let page = build(&state, &Form::new());
     assert!(page.rows[0].head.is_none());
-
-    // 离线档案永远没有皮肤：即使被塞了假数据，UI 侧也只认 DTO 的 `kind`
-    state.accounts[1].skin = None;
-    state.accounts[1].kind = AccountKind::Offline;
-    let page = build(&state, &Form::new());
-    assert!(page.rows[1].head.is_none());
 }
 
 /// 离线档案的说明**必须**带「无法连接启用正版验证的服务器」这条限定（中英都要）。
@@ -242,34 +324,31 @@ fn the_offline_track_keeps_the_agreed_wording() {
     }
 }
 
-/// 三条轨道在列表里**文案互不相同**（每一行都贴自己的轨道徽标）。
+/// **离线轨的失败必须可见**（复审 r1 P2-2）：横幅进模型、文案走 i18n、原文不上屏。
 #[test]
-fn every_track_has_its_own_badge() {
+fn a_failed_offline_add_is_visible() {
     let mut state = AppState::new();
-    state.accounts = vec![
-        account("a", AccountKind::Microsoft, true),
-        account("b", AccountKind::Authlib, false),
-        account("c", AccountKind::Offline, false),
-    ];
+    state.apply(AppEvent::Core(CoreEvent::AccountNoticeChanged(Some(
+        AccountNotice::new(
+            AccountNoticeCode::OfflineNameInvalid,
+            "ab",
+            "离线名字必须是 3–16 位字母/数字/下划线，收到 \"ab\"",
+        ),
+    ))));
     let page = build(&state, &Form::new());
-    let labels: Vec<&str> = page
-        .rows
-        .iter()
-        .map(|row| row.kind_label.as_str())
-        .collect();
-    assert_eq!(labels.len(), 3);
-    assert_ne!(labels[0], labels[1]);
-    assert_ne!(labels[1], labels[2]);
-    assert!(
-        labels.iter().all(|label| !label.is_empty()),
-        "轨道徽标不能空"
-    );
+    let notice = page.notice.as_ref().expect("失败要有横幅");
+    assert_eq!(notice.code, AccountNoticeCode::OfflineNameInvalid);
+    assert!(notice.failure, "失败横幅要用 error 配色");
+    let text = on_screen(&page);
+    assert!(text.contains("3–16"), "要说清规则：{text}");
+    assert!(!has_cjk(&text), "英文界面不许出现中文：{text}");
 }
 
-/// 表单状态：三条轨道各开各的，密码关面板即清。
+/// 表单状态：三条轨道各开各的，密码关面板即清，三卡默认收起。
 #[test]
 fn the_form_tracks_are_independent() {
     let mut form = Form::new();
+    assert!(!form.section_open, "有账号时三卡默认收起（P2-4）");
     form.open(Track::Offline);
     assert_eq!(form.panel, Panel::Offline);
     assert!(!form.offline_ready(), "空名字不能提交");
@@ -277,7 +356,6 @@ fn the_form_tracks_are_independent() {
     assert!(form.offline_ready());
 
     form.open(Track::Authlib);
-    assert_eq!(form.panel, Panel::Authlib);
     assert!(!form.authlib_ready(), "地址/登录名/密码缺一不可");
     form.server = "https://littleskin.cn/api/yggdrasil/".to_string();
     form.login = "alex".to_string();
@@ -299,10 +377,10 @@ fn login_phases_map_to_distinct_panels() {
             ..DeviceLoginView::new()
         },
     )));
-    assert!(matches!(
-        build(&state, &Form::new()).device,
-        DevicePanel::Requesting { .. }
-    ));
+    let page = build(&state, &Form::new());
+    assert!(matches!(page.device, DevicePanel::Requesting { .. }));
+    // 进行中也只有 i18n（不再复读 presenter 的中文状态串）
+    assert!(!has_cjk(&on_screen(&page)));
 
     state.apply(AppEvent::Core(CoreEvent::DeviceLoginChanged(
         DeviceLoginView::failed("HTTP 403"),
diff --git a/crates/app-iced/src/pages/account/widgets.rs b/crates/app-iced/src/pages/account/widgets.rs
index 1969319..d96db4a 100644
--- a/crates/app-iced/src/pages/account/widgets.rs
+++ b/crates/app-iced/src/pages/account/widgets.rs
@@ -11,15 +11,26 @@ use iced::widget::{container, image, row, text};
 use iced::{Alignment, Background, Border, ContentFit, Element, Length, Pixels};
 
 use unlucky_design::color::Role;
+use unlucky_design::component_map::Component;
+use unlucky_design::elevation::MaterialLayer;
+use unlucky_design::icons::IconKind;
 use unlucky_design::shape::ShapeScale;
 use unlucky_design::spacing::Space;
 use unlucky_design::typography::TypeRole;
+use unlucky_i18n::{Catalog, Key};
+use unlucky_presenter::dto::AccountNoticeCode;
 
 use crate::pages::frame;
+use crate::pages::frame::ICON_PX;
 use crate::theme::Ui;
 
-use super::super::Message;
-use super::model::Row;
+use crate::app::components::buttons::{self, Button};
+
+use crate::pages::Message as PageMessage;
+use crate::pages::Message;
+
+use super::model::{Hint, Notice, Row};
+use super::Message as Account;
 
 /// 头像块的可选尺寸（列表 40 / 当前账户 56）。
 pub const AVATAR_LIST: f32 = 40.0;
@@ -56,6 +67,185 @@ fn tone(ui: &Ui, tone: u8) -> (iced::Color, iced::Color) {
     }
 }
 
+/// 提示条的语义档（决定图标块与图标字形用哪一对角色）。
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Tone {
+    /// 失败（`ErrorContainer` / `OnErrorContainer` 图标块 + `Error` 图形）
+    Error,
+    /// 成功/信息（`SecondaryContainer` / `OnSecondaryContainer` 图标块 + `Check` 图形）
+    Info,
+}
+
+/// **M3 内联提示条**（账户页横幅与登录失败面板共用）。
+///
+/// ## 为什么不是通栏实心色块（tower r2 意见）
+///
+/// r1 的失败面板把 `errorContainer` 铺满整条内容宽——角色本身是对的（复审按像素采样反证过：
+/// 暗色取到容器角色 30 档、浅色取到 90 档，与设计层逐值一致），但**面积**让它像一条通栏告警带。
+/// 现在改成 M3 的 alert 形态：面板底走 `SurfaceContainerHigh` + 1dp 描边，
+/// `ErrorContainer` / `OnErrorContainer` 只作左侧**图标块**的强调（成功档换成 Secondary 容器），
+/// 标题用 `OnSurface`、正文与 code 行用 `OnSurfaceVariant`。语义仍由角色表达，视觉不再是红条。
+pub fn alert<'a>(
+    ui: &'a Ui,
+    tone: Tone,
+    title: &'a str,
+    body: String,
+    code: Option<String>,
+    actions: Vec<Element<'a, PageMessage>>,
+) -> Element<'a, PageMessage> {
+    let (chip_bg, chip_fg, glyph, glyph_color) = match tone {
+        Tone::Error => (
+            ui.color(Role::ErrorContainer),
+            ui.color(Role::OnErrorContainer),
+            IconKind::Error,
+            ui.color(Role::Error),
+        ),
+        Tone::Info => (
+            ui.color(Role::SecondaryContainer),
+            ui.color(Role::OnSecondaryContainer),
+            IconKind::Check,
+            ui.color(Role::OnSecondaryContainer),
+        ),
+    };
+    let _ = chip_fg;
+
+    let chip = container(frame::glyph_box(glyph, glyph_color, ICON_PX))
+        .width(Length::Fixed(ui.space(Space::X8)))
+        .height(Length::Fixed(ui.space(Space::X8)))
+        .align_x(Alignment::Center)
+        .align_y(Alignment::Center)
+        .style(move |_theme| container::Style {
+            background: Some(Background::Color(chip_bg)),
+            border: Border {
+                radius: ui.radius(ShapeScale::Full, ui.space(Space::X8)),
+                ..Border::default()
+            },
+            ..container::Style::default()
+        });
+
+    let mut lines = iced::widget::Column::new().spacing(ui.space(Space::X1));
+    lines = lines.push(frame::text_role(
+        ui,
+        TypeRole::TitleSmall,
+        true,
+        title,
+        ui.color(Role::OnSurface),
+    ));
+    lines = lines.push(frame::text_role_owned(
+        ui,
+        TypeRole::BodySmall,
+        false,
+        body,
+        ui.color(Role::OnSurfaceVariant),
+    ));
+    if let Some(code) = code {
+        lines = lines.push(frame::text_role_owned(
+            ui,
+            TypeRole::LabelSmall,
+            false,
+            code,
+            ui.color(Role::OnSurfaceVariant),
+        ));
+    }
+
+    container(
+        row![
+            chip,
+            container(lines).width(Length::Fill),
+            row(actions)
+                .spacing(ui.space(Space::X2))
+                .align_y(Alignment::Center),
+        ]
+        .spacing(ui.space(Space::X3))
+        .align_y(Alignment::Center)
+        .width(Length::Fill),
+    )
+    .width(Length::Fill)
+    .padding(ui.metrics().card_padding)
+    .style(move |_theme| container::Style {
+        background: Some(Background::Color(ui.layer(MaterialLayer::Card))),
+        border: ui.outlined(Component::OutlinedCard.spec().shape),
+        ..container::Style::default()
+    })
+    .into()
+}
+
+/// 账户页横幅：添加/删除/切换的结果（**页面上真实可见的控件**，不是 toast）。
+///
+/// 为什么必须有它：app-iced 不渲染 toast（复审 r1 P2-2），离线名字不合法/重名/落盘失败时
+/// 用户原本什么都看不到。文案按 `AccountNoticeCode` 查 i18n，后端原文不进 UI。
+pub fn banner<'a>(ui: &'a Ui, notice: &'a Notice, catalog: Catalog) -> Element<'a, PageMessage> {
+    let tone = if notice.failure {
+        Tone::Error
+    } else {
+        Tone::Info
+    };
+    let title = if notice.failure {
+        catalog.text(Key::AccountNoticeTitleFailed)
+    } else {
+        catalog.text(Key::AccountNoticeTitleDone)
+    };
+    let message = notice_text(notice, catalog);
+    let dismiss = buttons::text(
+        ui,
+        Button::new(
+            catalog.text(Key::AccountNoticeDismiss),
+            Account::DismissNotice.into_page(),
+        ),
+    );
+    // 只有失败才显示稳定 code（成功态列一串 `added` 是噪音）
+    let code = notice
+        .failure
+        .then(|| catalog.render(Key::AccountFailureCode, &[("code", notice.code.code())]));
+    alert(ui, tone, title, message, code, vec![dismiss])
+}
+
+/// 横幅文案（码 → i18n；主题名拼进带占位符的几句）。
+fn notice_text(notice: &Notice, catalog: Catalog) -> String {
+    let name = notice.subject.as_str();
+    match notice.code {
+        AccountNoticeCode::Added => catalog.render(Key::AccountNoticeAdded, &[("name", name)]),
+        AccountNoticeCode::Removed => catalog.render(Key::AccountNoticeRemoved, &[("name", name)]),
+        AccountNoticeCode::Switched => {
+            catalog.render(Key::AccountNoticeSwitched, &[("name", name)])
+        }
+        AccountNoticeCode::OfflineNameInvalid => catalog
+            .text(Key::AccountNoticeOfflineNameInvalid)
+            .to_string(),
+        AccountNoticeCode::AccountExists => {
+            catalog.text(Key::AccountNoticeAccountExists).to_string()
+        }
+        AccountNoticeCode::StoreFailed => catalog.text(Key::AccountNoticeStoreFailed).to_string(),
+        AccountNoticeCode::NotFound => catalog.text(Key::AccountNoticeNotFound).to_string(),
+        AccountNoticeCode::Other => catalog.text(Key::AccountNoticeOther).to_string(),
+    }
+}
+
+/// 一次性引导（重新登录时告诉用户下一步）。
+pub fn hint<'a>(
+    ui: &'a Ui,
+    hint: Hint,
+    page: &'a super::Page,
+    catalog: Catalog,
+) -> Element<'a, PageMessage> {
+    let message = match hint {
+        Hint::AuthlibReauth => catalog.render(
+            Key::AccountHintAuthlibReauth,
+            &[("server", page.form.server.as_str())],
+        ),
+        Hint::OfflineNoRelogin => catalog.text(Key::AccountHintOfflineNoRelogin).to_string(),
+    };
+    container(frame::text_role_owned(
+        ui,
+        TypeRole::BodySmall,
+        false,
+        message,
+        ui.color(Role::OnSurfaceVariant),
+    ))
+    .width(Length::Fill)
+    .into()
+}
+
 /// 头像块：有真图就画图（圆角裁切），没有就画**首字母块**。
 ///
 /// 三条铁律：① 图解码失败一定回到首字母块（不白块）；② 首字母块的字来自 `AccountView::monogram`，
diff --git a/crates/app-iced/src/shell/mod.rs b/crates/app-iced/src/shell/mod.rs
index 141c976..67f67e3 100644
--- a/crates/app-iced/src/shell/mod.rs
+++ b/crates/app-iced/src/shell/mod.rs
@@ -48,6 +48,17 @@ use crate::cli::ForcedState;
 use crate::icons;
 use crate::theme::Ui;
 
+/// 导航轨的一帧状态（M114）：主序列高亮项 + 轨底账户头像位。
+///
+/// 绑成一个结构体是为了让 [`view_with_account`] 的参数停在 8 个以内（clippy `too_many_arguments`），
+/// 也把「这两个值永远一起传」这件事写进类型：谁加导航项都绕不开轨底那一格。
+pub struct NavRail {
+    /// 高亮哪个主序列项（账户页是 `NavItem::Account`）
+    pub selected: NavItem,
+    /// 轨底头像位的状态（**按值持有**：它是每帧现算的，引用会让整棵树的生存期挂到临时值上）
+    pub account: nav::RailAccount,
+}
+
 /// 整棵树（**内容槽位版**）：外壳画标题栏 / 缩放热区 / 导航轨 / 右栏，中间那块交给调用方。
 ///
 /// 产品页的唯一入口（M90 r2 / P1-1；M104 起多两样东西：右侧助手栏与拖拽取指针层；
@@ -68,14 +79,14 @@ use crate::theme::Ui;
 ///
 /// `background` 由 `pages::appearance::layer` 产出（已与 `Message::Page` 映射过）；垫在 `stack!`
 /// 最底层，于是「面板 α < 1」时能真的看见它——这就是 D34 在像素上的落点。
-// 10 个形参：M104 的 `right`/`overlay`、M106 的 `lang`（导航轨标签按语言取词）、
-// M114 的 `account`（轨底账户头像位状态）。拆成结构体要动 `app/view.rs` / `account_page.rs`
-// 的调用点，而那正是 M104/M105/M109 反复设锚点的地方——先就地 `allow`，等下次合流再结构体化。
+// 9 个形参：M104 的 `right`/`overlay`、M106 的 `lang`（导航轨标签按语言取词），
+// 加上 M114 把「高亮项 + 轨底账户态」捆成的 `NavRail`（捆它是为了少一个形参）。
+// 再拆就得动 `app/view.rs` / `account_page.rs` 的调用点，而那正是 M104/M105/M109 反复设锚点的
+// 地方——先就地 `allow`（主线原本也在这条上 `allow`），等下次合流再结构体化。
 #[allow(clippy::too_many_arguments)]
-pub fn view_with_background<'a>(
+pub fn view_with_account<'a>(
     ui: &'a Ui,
-    selected: NavItem,
-    account: &nav::RailAccount,
+    nav_state: NavRail,
     app_title: &'a str,
     background: Option<Element<'a, Message>>,
     content: Element<'a, Message>,
@@ -87,10 +98,13 @@ pub fn view_with_background<'a>(
     // 右栏（M104）是 `row` 的**第三个兄弟**而不是叠层：它是布局宽度的一部分，压在上面会让
     // 中栏以为自己还有那么宽（那就是任务里禁止的「溢出」）。它的宽度由 `agent::docked` 自己声明。
     // M106：导航轨标签按当前界面语言取词（`lang` 一路从 `App::lang()` 递进来）。
-    // M114：`account` 只影响轨底那一格，`right`/`overlay` 的语义一字未动。
-    let mut work = row![nav::rail(ui, selected, account, forced, lang), content]
-        .width(Length::Fill)
-        .height(Length::Fill);
+    // M114：`nav_state` 只影响轨底那一格，`right`/`overlay` 的语义一字未动。
+    let mut work = row![
+        nav::rail(ui, nav_state.selected, &nav_state.account, forced, lang),
+        content
+    ]
+    .width(Length::Fill)
+    .height(Length::Fill);
     if let Some(right) = right {
         work = work.push(right);
     }
diff --git a/crates/i18n/src/catalog/account.rs b/crates/i18n/src/catalog/account.rs
index 5aa10ea..6bcb71c 100644
--- a/crates/i18n/src/catalog/account.rs
+++ b/crates/i18n/src/catalog/account.rs
@@ -52,8 +52,7 @@ macro_rules! account_entries {
             AccountDeviceCodeLabel => ("Enter this code", "输入这个用户码"),
             AccountDeviceCodeCopy => ("Copy code", "复制用户码"),
             AccountDeviceLinkCopy => ("Copy link", "复制链接"),
-            AccountDeviceOpenLink => ("Open link", "打开链接"),
-            AccountDeviceCountdown => ("{secs}s left", "剩 {secs}s"),
+            AccountDeviceCountdown => ("{time} left", "剩 {time}"),
             AccountDeviceExpired => ("This code has expired. Start again for a fresh one.", "这个用户码已过期，重新开始换一个新的。"),
             AccountDeviceRetry => ("Try again", "重试"),
             AccountDeviceCancel => ("Cancel", "取消"),
@@ -67,7 +66,7 @@ macro_rules! account_entries {
             AccountPasswordLabel => ("Password", "密码"),
             AccountPasswordHint => ("Used once for this sign-in. It is never stored.", "只在这次登录里用一次，不会保存。"),
             AccountAuthlibSubmit => ("Sign in", "登录"),
-            AccountAuthlibIdleHint => ("Check the server address first; signing in only starts after the check passes.", "先校验服务器地址，通过之后才能登录。"),
+            AccountAuthlibIdleHint => ("The server is checked automatically when you sign in; Check server only does it up front.", "登录时会自动校验服务器；「校验服务器」只是提前跑一遍。"),
             // ── 皮肤区
             AccountSkinTitle => ("Skin", "皮肤"),
             AccountSkinNone => ("No skin available", "没有可用皮肤"),
@@ -80,6 +79,32 @@ macro_rules! account_entries {
             AccountServerOk => ("Server {server} is ready", "服务器 {server} 可用"),
             AccountLoginFailed => ("Sign-in failed", "登录失败"),
             AccountCurrentTitle => ("Current account", "当前账户"),
+            // ── 失败原因码（M114 r2：后端只给码，文案在这里；原文只进日志）
+            AccountFailureCode => ("Code: {code}", "代码：{code}"),
+            AccountFailureDenied => ("The server refused this sign-in (access denied).", "服务器拒绝了这次登录（拒绝访问）。"),
+            AccountFailureWhitelist => ("Microsoft has not approved this launcher's app registration yet. An administrator has to accept the app, then try again.", "微软还没批准本启动器的应用注册：需要管理员同意该应用后再试。"),
+            AccountFailureUnreachable => ("Could not reach the server. Check the network connection or the address, then try again.", "连不上服务器：检查网络或地址后重试。"),
+            AccountFailureNotAuthlib => ("This address does not look like an authlib-injector server (the API root usually ends with /api/yggdrasil/).", "这个地址不像 authlib-injector 服务器（API 根通常以 /api/yggdrasil/ 结尾）。"),
+            AccountFailureBadCredentials => ("The server rejected the username or password.", "服务器不认这个用户名或密码。"),
+            AccountFailureNoProfile => ("The account has no Minecraft profile on this server yet. Create the character on the server first.", "这个账号在该服务器上还没有角色：先在皮肤站里创建角色。"),
+            AccountFailureStore => ("Could not save the account to disk.", "账户没能写到磁盘上。"),
+            AccountFailureOther => ("The sign-in failed. The full reason is in the launcher log.", "登录失败，完整原因在启动器日志里。"),
+            AccountDeviceRequesting => ("Contacting Microsoft…", "正在联系微软…"),
+            // ── 账户页横幅（添加/删除/切换的结果；页面上真实可见，不是 toast）
+            AccountNoticeAdded => ("Added {name}", "已添加 {name}"),
+            AccountNoticeRemoved => ("Removed {name}", "已删除 {name}"),
+            AccountNoticeSwitched => ("{name} will be used for the next launch", "{name} 将作为下次启动的账户"),
+            AccountNoticeOfflineNameInvalid => ("Profile names must be 3–16 letters, digits or underscores.", "档案名必须是 3–16 位字母、数字或下划线。"),
+            AccountNoticeAccountExists => ("An account with that name already exists.", "同名账户已经存在。"),
+            AccountNoticeStoreFailed => ("Could not save the account store. Check the disk and try again.", "账户库写不进去：检查磁盘后重试。"),
+            AccountNoticeNotFound => ("That account no longer exists.", "这个账户已经不在了。"),
+            AccountNoticeOther => ("The account action failed. The full reason is in the launcher log.", "账户操作失败，完整原因在启动器日志里。"),
+            AccountNoticeDismiss => ("Dismiss", "关闭"),
+            AccountNoticeTitleFailed => ("Account action failed", "账户操作失败"),
+            AccountNoticeTitleDone => ("Account updated", "账户已更新"),
+            // ── 重新登录的引导
+            AccountHintAuthlibReauth => ("Enter the password again for {server}.", "请输入 {server} 的密码。"),
+            AccountHintOfflineNoRelogin => ("Local profiles have no server account to sign in again — create a new profile instead.", "本地档案没有可重新登录的服务器账户，请新建一个档案。"),
         } }
     };
 }
diff --git a/crates/i18n/src/catalog/golden.rs b/crates/i18n/src/catalog/golden.rs
index e3b42af..7783963 100644
--- a/crates/i18n/src/catalog/golden.rs
+++ b/crates/i18n/src/catalog/golden.rs
@@ -336,8 +336,7 @@ pub(super) const GOLDEN: &[(&str, &str, &str)] = &[
     ("AccountDeviceCodeLabel", "Enter this code", "输入这个用户码"),
     ("AccountDeviceCodeCopy", "Copy code", "复制用户码"),
     ("AccountDeviceLinkCopy", "Copy link", "复制链接"),
-    ("AccountDeviceOpenLink", "Open link", "打开链接"),
-    ("AccountDeviceCountdown", "{secs}s left", "剩 {secs}s"),
+    ("AccountDeviceCountdown", "{time} left", "剩 {time}"),
     ("AccountDeviceExpired", "This code has expired. Start again for a fresh one.", "这个用户码已过期，重新开始换一个新的。"),
     ("AccountDeviceRetry", "Try again", "重试"),
     ("AccountDeviceCancel", "Cancel", "取消"),
@@ -350,7 +349,7 @@ pub(super) const GOLDEN: &[(&str, &str, &str)] = &[
     ("AccountPasswordLabel", "Password", "密码"),
     ("AccountPasswordHint", "Used once for this sign-in. It is never stored.", "只在这次登录里用一次，不会保存。"),
     ("AccountAuthlibSubmit", "Sign in", "登录"),
-    ("AccountAuthlibIdleHint", "Check the server address first; signing in only starts after the check passes.", "先校验服务器地址，通过之后才能登录。"),
+    ("AccountAuthlibIdleHint", "The server is checked automatically when you sign in; Check server only does it up front.", "登录时会自动校验服务器；「校验服务器」只是提前跑一遍。"),
     ("AccountSkinTitle", "Skin", "皮肤"),
     ("AccountSkinNone", "No skin available", "没有可用皮肤"),
     ("AccountSkinHint", "Skins come from the account's own server; nothing is generated locally.", "皮肤来自账户自己的服务器，本地不生成任何假皮肤。"),
@@ -361,4 +360,27 @@ pub(super) const GOLDEN: &[(&str, &str, &str)] = &[
     ("AccountServerOk", "Server {server} is ready", "服务器 {server} 可用"),
     ("AccountLoginFailed", "Sign-in failed", "登录失败"),
     ("AccountCurrentTitle", "Current account", "当前账户"),
+    ("AccountFailureCode", "Code: {code}", "代码：{code}"),
+    ("AccountFailureDenied", "The server refused this sign-in (access denied).", "服务器拒绝了这次登录（拒绝访问）。"),
+    ("AccountFailureWhitelist", "Microsoft has not approved this launcher's app registration yet. An administrator has to accept the app, then try again.", "微软还没批准本启动器的应用注册：需要管理员同意该应用后再试。"),
+    ("AccountFailureUnreachable", "Could not reach the server. Check the network connection or the address, then try again.", "连不上服务器：检查网络或地址后重试。"),
+    ("AccountFailureNotAuthlib", "This address does not look like an authlib-injector server (the API root usually ends with /api/yggdrasil/).", "这个地址不像 authlib-injector 服务器（API 根通常以 /api/yggdrasil/ 结尾）。"),
+    ("AccountFailureBadCredentials", "The server rejected the username or password.", "服务器不认这个用户名或密码。"),
+    ("AccountFailureNoProfile", "The account has no Minecraft profile on this server yet. Create the character on the server first.", "这个账号在该服务器上还没有角色：先在皮肤站里创建角色。"),
+    ("AccountFailureStore", "Could not save the account to disk.", "账户没能写到磁盘上。"),
+    ("AccountFailureOther", "The sign-in failed. The full reason is in the launcher log.", "登录失败，完整原因在启动器日志里。"),
+    ("AccountDeviceRequesting", "Contacting Microsoft…", "正在联系微软…"),
+    ("AccountNoticeAdded", "Added {name}", "已添加 {name}"),
+    ("AccountNoticeRemoved", "Removed {name}", "已删除 {name}"),
+    ("AccountNoticeSwitched", "{name} will be used for the next launch", "{name} 将作为下次启动的账户"),
+    ("AccountNoticeOfflineNameInvalid", "Profile names must be 3–16 letters, digits or underscores.", "档案名必须是 3–16 位字母、数字或下划线。"),
+    ("AccountNoticeAccountExists", "An account with that name already exists.", "同名账户已经存在。"),
+    ("AccountNoticeStoreFailed", "Could not save the account store. Check the disk and try again.", "账户库写不进去：检查磁盘后重试。"),
+    ("AccountNoticeNotFound", "That account no longer exists.", "这个账户已经不在了。"),
+    ("AccountNoticeOther", "The account action failed. The full reason is in the launcher log.", "账户操作失败，完整原因在启动器日志里。"),
+    ("AccountNoticeDismiss", "Dismiss", "关闭"),
+    ("AccountNoticeTitleFailed", "Account action failed", "账户操作失败"),
+    ("AccountNoticeTitleDone", "Account updated", "账户已更新"),
+    ("AccountHintAuthlibReauth", "Enter the password again for {server}.", "请输入 {server} 的密码。"),
+    ("AccountHintOfflineNoRelogin", "Local profiles have no server account to sign in again — create a new profile instead.", "本地档案没有可重新登录的服务器账户，请新建一个档案。"),
 ];
diff --git a/crates/presenter/src/dto/accounts.rs b/crates/presenter/src/dto/accounts.rs
index 36deee4..9c893a5 100644
--- a/crates/presenter/src/dto/accounts.rs
+++ b/crates/presenter/src/dto/accounts.rs
@@ -10,55 +10,19 @@
 //! | [`redact`] | 形状脱敏：JWT / 不透明串 / `token=...` 一律抹掉（第二道脱敏器） |
 //! | `tests` | 契约 round-trip + 凭据红线的入口断言 |
 
+mod failure;
+mod kind;
 mod redact;
 #[cfg(test)]
 #[path = "accounts/tests.rs"]
 mod tests;
 
+pub use failure::{AccountNotice, AccountNoticeCode, LoginFailure};
+pub use kind::AccountKind;
 pub use redact::{looks_like_jwt, redact, REDACTED};
 
 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（CLI/终端用；GUI 走 i18n 词表，不读这里的中文）。
-    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 {
@@ -175,8 +139,11 @@ pub struct DeviceLoginView {
     pub qr_link: String,
     /// 有效期（秒；0 = 未知）
     pub expires_in: u64,
-    /// 状态/错误文案
+    /// 状态/错误文案（**失败时是原始诊断，只进日志，不上屏**）
     pub message: String,
+    /// 失败原因码（`None` = 不是失败态 / 未分类）
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub failure: Option<LoginFailure>,
     /// 成功后入库的账户展示名
     pub account_name: String,
 }
@@ -197,6 +164,7 @@ impl DeviceLoginView {
             qr_link: String::new(),
             expires_in: 0,
             message: String::new(),
+            failure: None,
             account_name: String::new(),
         }
     }
@@ -223,6 +191,7 @@ impl DeviceLoginView {
                 "在浏览器打开 {verification_uri} 并输入用户码 {user_code}（{} 秒内有效）",
                 expires_in
             ),
+            failure: None,
             account_name: String::new(),
         }
     }
@@ -250,15 +219,22 @@ impl DeviceLoginView {
             qr_link: authorization_url.to_string(),
             expires_in,
             message,
+            failure: None,
             account_name: String::new(),
         }
     }
 
     /// 失败态（文案在入口就脱敏：错误原文里可能带着服务端回显的 token）。
     pub fn failed(message: impl Into<String>) -> Self {
+        Self::failed_as(LoginFailure::Other, message)
+    }
+
+    /// 带**原因码**的失败态（页面据码出 i18n；原文只进日志）。
+    pub fn failed_as(failure: LoginFailure, message: impl Into<String>) -> Self {
         Self {
             phase: DeviceLoginPhase::Failed,
             message: redact(&message.into()),
+            failure: Some(failure),
             ..Self::new()
         }
     }
@@ -269,6 +245,7 @@ impl DeviceLoginView {
         Self {
             phase: DeviceLoginPhase::Succeeded,
             message: format!("已登录：{account_name}"),
+            failure: None,
             account_name,
             ..Self::new()
         }
@@ -280,7 +257,7 @@ impl DeviceLoginView {
 /// **凭据红线**：`password` 只是「用户这一次输入的请求值」，从页面流到 host 的
 /// `AuthlibAuth::authenticate` 调用栈里，host 取走即弃——不入账户库、不进日志、
 /// 不进任何回程 DTO。所以本类型只有一个方向（UI → host），回程只有 [`AuthlibLoginView`]。
-#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+#[derive(Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct AuthlibRequest {
     /// 认证服务器地址（用户原样输入；host 侧 `normalize_api_root` 规范化）
     pub server: String,
@@ -290,6 +267,17 @@ pub struct AuthlibRequest {
     pub password: String,
 }
 
+/// **手写 `Debug`**：任何 `{:?}`（日志/panic 消息/测试失败输出）都不得带出明文密码。
+impl std::fmt::Debug for AuthlibRequest {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("AuthlibRequest")
+            .field("server", &redact(&self.server))
+            .field("login", &redact(&self.login))
+            .field("password", &REDACTED)
+            .finish()
+    }
+}
+
 impl AuthlibRequest {
     /// 构造。
     pub fn new(
@@ -324,8 +312,11 @@ pub struct AuthlibLoginView {
     pub server: String,
     /// 服务发现里的服务器名（校验通过后才有；空 = 没校验/没名字）
     pub server_name: String,
-    /// 状态/错误文案（已脱敏）
+    /// 状态/错误文案（**失败时是原始诊断，只进日志，不上屏**）
     pub message: String,
+    /// 失败原因码（`None` = 不是失败态 / 未分类）
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub failure: Option<LoginFailure>,
     /// 成功后入库的账户展示名
     pub account_name: String,
 }
@@ -344,6 +335,7 @@ impl AuthlibLoginView {
             server: String::new(),
             server_name: String::new(),
             message: String::new(),
+            failure: None,
             account_name: String::new(),
         }
     }
@@ -355,6 +347,7 @@ impl AuthlibLoginView {
             server: server.to_string(),
             server_name: String::new(),
             message: redact(message),
+            failure: None,
             account_name: String::new(),
         }
     }
@@ -366,15 +359,22 @@ impl AuthlibLoginView {
             server: server.to_string(),
             server_name: redact(server_name),
             message: format!("服务器可用：{}", server_name.trim()),
+            failure: None,
             account_name: String::new(),
         }
     }
 
     /// 失败态（文案在入口就脱敏）。
     pub fn failed(message: impl Into<String>) -> Self {
+        Self::failed_as(LoginFailure::Other, message)
+    }
+
+    /// 带**原因码**的失败态（页面据码出 i18n；原文只进日志）。
+    pub fn failed_as(failure: LoginFailure, message: impl Into<String>) -> Self {
         Self {
             phase: DeviceLoginPhase::Failed,
             message: redact(&message.into()),
+            failure: Some(failure),
             ..Self::new()
         }
     }
diff --git a/crates/presenter/src/dto/accounts/failure.rs b/crates/presenter/src/dto/accounts/failure.rs
new file mode 100644
index 0000000..3d60ffe
--- /dev/null
+++ b/crates/presenter/src/dto/accounts/failure.rs
@@ -0,0 +1,132 @@
+//! 失败原因码与账户页横幅（M114 r2 / 复审 P1-1、P2-2）。
+//!
+//! ## 为什么这一层必须有
+//!
+//! core/presenter 的诊断串是中文人话。把它们直接画到英文界面上，就是复审 r1 那条 p1
+//! （「全英文界面里整句中文」）。根因不是 catalog 缺条目，而是**后端诊断串没有结构**：
+//! 页面除了原样画没有别的选择。
+//!
+//! 这里补的就是那个缺环——把「失败属于哪一类」「这次操作的结果是什么」变成**枚举**。
+//! 页面据 `code()` 选 i18n key 出标题 + 正文 + 一行 `Code: …`；原始诊断留在 `message` /
+//! `detail` 里，**只进日志与详细信息，不上屏**。
+//!
+//! 约束：`code()` 一律 ascii 且**不随语言变**（日志、测试、用户报障都靠它对齐）。
+
+use serde::{Deserialize, Serialize};
+
+use super::redact;
+
+/// 登录失败的**结构化原因码**（M114 r2 / 复审 P1-1）。
+///
+/// 为什么要有它：core/presenter 的诊断串是中文人话，**直接上屏**会让英文界面里出现整句中文
+/// （复审 r1 的 p1）。这里把「失败属于哪一类」变成**可判据的枚举**，页面据码选 i18n key 出
+/// 标题 + 正文 + 一个稳定 code；原始诊断只留在 `message` 里进日志/详细信息，**不上屏**。
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum LoginFailure {
+    /// 服务器/微软明确拒绝（403、OAuth `error`、XErr）
+    Denied,
+    /// 应用注册还没获批（AADSTS7000218 一类「白名单未批」）
+    NotWhitelisted,
+    /// 网络不可达 / 超时
+    Unreachable,
+    /// 目标地址不是 authlib-injector 服务器（响应不是服务发现 JSON）
+    NotAuthlibServer,
+    /// 服务器拒绝了这个账号（密码错 / 账号不存在）
+    BadCredentials,
+    /// 服务器没有返回角色（账号还没创建角色）
+    NoProfile,
+    /// 落盘失败（账户库读写）
+    StoreFailed,
+    /// 其它（未知原因；原文只在 `message`）
+    Other,
+}
+
+impl LoginFailure {
+    /// 稳定的 ascii code（日志 / 页面「Code: …」/ 测试断言都用它，**不随语言变**）。
+    #[must_use]
+    pub const fn code(self) -> &'static str {
+        match self {
+            Self::Denied => "denied",
+            Self::NotWhitelisted => "whitelist_pending",
+            Self::Unreachable => "unreachable",
+            Self::NotAuthlibServer => "not_authlib_server",
+            Self::BadCredentials => "bad_credentials",
+            Self::NoProfile => "no_profile",
+            Self::StoreFailed => "store_failed",
+            Self::Other => "other",
+        }
+    }
+}
+
+/// 账户页的**一次性横幅**（添加/删除/切换的结果；页面据 `code` 选 i18n）。
+///
+/// 为什么不是 toast：app-iced 不渲染 toast（复审 r1 P2-2 实锤），发 toast 等于用户什么都看不到。
+/// 横幅是页面上的真实控件，用户点了「Create profile」失败后一定看得见。
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct AccountNotice {
+    /// 结果码（决定标题/正文/颜色）
+    pub code: AccountNoticeCode,
+    /// 涉及的账户名或服务器（拼进文案；可为空）
+    pub subject: String,
+    /// 原始诊断（已脱敏；**只进日志/详细信息，不上屏**）
+    pub detail: String,
+}
+
+impl AccountNotice {
+    /// 构造。
+    pub fn new(
+        code: AccountNoticeCode,
+        subject: impl Into<String>,
+        detail: impl Into<String>,
+    ) -> Self {
+        Self {
+            code,
+            subject: subject.into(),
+            detail: redact(&detail.into()),
+        }
+    }
+}
+
+/// 横幅的结果码。
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum AccountNoticeCode {
+    /// 已添加
+    Added,
+    /// 已删除
+    Removed,
+    /// 已切换
+    Switched,
+    /// 名字不合法（长度/字符集）
+    OfflineNameInvalid,
+    /// 同名账户已存在
+    AccountExists,
+    /// 落盘失败
+    StoreFailed,
+    /// 找不到这个账户
+    NotFound,
+    /// 其它（原文在 `detail`）
+    Other,
+}
+
+impl AccountNoticeCode {
+    /// 是否是一个「失败」结果（决定横幅配色）。
+    #[must_use]
+    pub const fn is_failure(self) -> bool {
+        !matches!(self, Self::Added | Self::Removed | Self::Switched)
+    }
+
+    /// 稳定 ascii code（日志/测试用）。
+    #[must_use]
+    pub const fn code(self) -> &'static str {
+        match self {
+            Self::Added => "added",
+            Self::Removed => "removed",
+            Self::Switched => "switched",
+            Self::OfflineNameInvalid => "offline_name_invalid",
+            Self::AccountExists => "account_exists",
+            Self::StoreFailed => "store_failed",
+            Self::NotFound => "not_found",
+            Self::Other => "other",
+        }
+    }
+}
diff --git a/crates/presenter/src/dto/accounts/kind.rs b/crates/presenter/src/dto/accounts/kind.rs
new file mode 100644
index 0000000..e2e27a3
--- /dev/null
+++ b/crates/presenter/src/dto/accounts/kind.rs
@@ -0,0 +1,43 @@
+//! 账户轨道（三轨统一抽象，`09 §G6` / `D9`）。
+
+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（CLI/终端用；GUI 走 i18n 词表，不读这里的中文）。
+    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,
+        }
+    }
+}
diff --git a/crates/presenter/src/dto/accounts/tests.rs b/crates/presenter/src/dto/accounts/tests.rs
index fa26729..e97f9cf 100644
--- a/crates/presenter/src/dto/accounts/tests.rs
+++ b/crates/presenter/src/dto/accounts/tests.rs
@@ -92,6 +92,16 @@ fn authlib_request_never_prints_the_password() {
     assert!(shown.contains(REDACTED), "{shown}");
 }
 
+/// `Debug` 也不许带出密码（复审 r1 P3-5）：日志一行 `{:?}` 就破红线。
+#[test]
+fn authlib_request_debug_never_prints_the_password() {
+    let request = AuthlibRequest::new("https://littleskin.cn/api/yggdrasil/", "me", "hunter2");
+    let shown = format!("{request:?}");
+    assert!(!shown.contains("hunter2"), "{shown}");
+    assert!(shown.contains(REDACTED), "{shown}");
+    assert!(shown.contains("littleskin"), "{shown}");
+}
+
 #[test]
 fn authlib_view_carries_the_server_name_and_no_tokens() {
     let view = AuthlibLoginView::reachable("https://littleskin.cn/api/yggdrasil/", "LittleSkin");
diff --git a/crates/presenter/src/dto/events.rs b/crates/presenter/src/dto/events.rs
index 8f2eb27..e9d5d39 100644
--- a/crates/presenter/src/dto/events.rs
+++ b/crates/presenter/src/dto/events.rs
@@ -9,9 +9,9 @@ use serde::{Deserialize, Serialize};
 use crate::dialogs::{DialogId, DialogRequest};
 use crate::dto::CreateRequest;
 use crate::dto::{
-    // 主线（M109 的 Content* / M113 的 Pack*）与 M114 的 Authlib* 的并集。
-    AccountView, AgentEvent, AuthlibLoginView, AuthlibRequest, ContentInstallRequest, ContentQuery,
-    ContentResults, DeviceLoginView, DiagnosisReport, InstallProgressView, InstanceId,
+    // 主线（M109 的 Content* / M113 的 Pack*）与 M114 的 Authlib*/AccountNotice 的并集。
+    AccountNotice, AccountView, AgentEvent, AuthlibLoginView, AuthlibRequest, ContentInstallRequest,
+    ContentQuery, ContentResults, DeviceLoginView, DiagnosisReport, InstallProgressView, InstanceId,
     InstanceRuntime, InstanceSummary, JavaPageView, LoaderKind, LogLine, LogOutcome, LogSession,
     NoticeView, PackCommand, PackEvent, SessionId, SettingGroupView, VersionCategory,
     VersionSummary,
@@ -72,6 +72,8 @@ pub enum CoreEvent {
     DeviceLoginChanged(DeviceLoginView),
     /// 第三方轨（authlib-injector）登录/校验状态刷新
     AuthlibLoginChanged(AuthlibLoginView),
+    /// 账户页横幅（添加/删除/切换的结果；`None` = 清掉横幅）
+    AccountNoticeChanged(Option<AccountNotice>),
     /// 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）
@@ -178,6 +180,8 @@ pub enum AppCommand {
     AddAuthlibAccount(AuthlibRequest),
     /// 只校验第三方皮肤站地址（服务发现）：结果走 `AuthlibLoginChanged`
     ProbeAuthlibServer(String),
+    /// 关掉账户页横幅（页面上的 × / Dismiss）
+    DismissAccountNotice,
     /// 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）
diff --git a/crates/presenter/src/dto/mod.rs b/crates/presenter/src/dto/mod.rs
index 5a1a3d2..e106af6 100644
--- a/crates/presenter/src/dto/mod.rs
+++ b/crates/presenter/src/dto/mod.rs
@@ -29,8 +29,9 @@ mod settings;
 mod versions;
 
 pub use accounts::{
-    looks_like_jwt, redact, AccountKind, AccountView, AuthlibLoginView, AuthlibRequest,
-    DeviceLoginPhase, DeviceLoginView, SkinImage, REDACTED,
+    looks_like_jwt, redact, AccountKind, AccountNotice, AccountNoticeCode, AccountView,
+    AuthlibLoginView, AuthlibRequest, DeviceLoginPhase, DeviceLoginView, LoginFailure, SkinImage,
+    REDACTED,
 };
 pub use agent::{AgentEvent, ChatMessage, ChatRole, ConfirmRequest, Sensitivity, ToolCallView};
 pub use content::{
diff --git a/crates/presenter/src/host/accounts.rs b/crates/presenter/src/host/accounts.rs
index 426f7ef..8c486a5 100644
--- a/crates/presenter/src/host/accounts.rs
+++ b/crates/presenter/src/host/accounts.rs
@@ -19,7 +19,10 @@ use unlucky_core::auth::offline::offline_meta;
 use unlucky_core::auth::{AccountStore, AuthResult};
 use unlucky_core::download::blocking::block_on;
 
-use crate::dto::{AccountKind, AccountView, DeviceLoginView};
+use crate::dto::CoreEvent;
+use crate::dto::{
+    AccountKind, AccountNotice, AccountNoticeCode, AccountView, DeviceLoginView, LoginFailure,
+};
 
 use super::env::HostEnv;
 use super::job::{spawn, HostTask, JobSender};
@@ -28,8 +31,33 @@ use super::opener;
 /// 第三方轨（服务发现 / 密码登录 / 皮肤抓取）。
 pub mod authlib;
 
+mod failure;
+
+pub use failure::{valid_offline_name, AccountFailure};
+
+use failure::classify;
+
 pub use authlib::{fetch_skin, spawn_probe, start_login as start_authlib_login};
 
+impl super::CoreHost {
+    /// 推一条账户页横幅（一次性操作结果；页面渲染后由用户关掉）。
+    pub(super) fn notice(&mut self, code: AccountNoticeCode, subject: &str, detail: &str) {
+        self.send(CoreEvent::AccountNoticeChanged(Some(AccountNotice::new(
+            code, subject, detail,
+        ))));
+    }
+
+    /// 账户写操作失败：**原文进日志**，页面只拿结构化码 + 主题名。
+    pub(super) fn notice_failure(&mut self, failure: AccountFailure, subject: &str) {
+        eprintln!(
+            "[accounts] 操作失败（{}，subject={subject}）：{}",
+            failure.code.code(),
+            failure.detail
+        );
+        self.notice(failure.code, subject, &failure.detail);
+    }
+}
+
 /// 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());
@@ -85,18 +113,25 @@ fn civil_from_days(days: i64) -> (i64, u32, u32) {
 ///
 /// # 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> {
+/// 名字不合法、同名冲突、落盘失败时返回 [`AccountFailure`]（带结构化码）。
+pub fn add_offline(env: &HostEnv, name: &str) -> Result<String, AccountFailure> {
     let name = name.trim();
-    let meta = offline_meta(name, now_ms()).map_err(|error| error.to_string())?;
+    if !valid_offline_name(name) {
+        return Err(AccountFailure {
+            code: AccountNoticeCode::OfflineNameInvalid,
+            detail: format!("离线名字必须是 3–16 位字母/数字/下划线，收到 {name:?}"),
+        });
+    }
+    let meta = offline_meta(name, now_ms())
+        .map_err(|error| AccountFailure::classify(error, AccountNoticeCode::OfflineNameInvalid))?;
     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}"))?;
+        .map_err(|error| AccountFailure::classify(error, AccountNoticeCode::AccountExists))?;
     store
         .save()
-        .map_err(|error| format!("保存账户失败：{error}"))?;
+        .map_err(|error| AccountFailure::classify(error, AccountNoticeCode::StoreFailed))?;
     Ok(display)
 }
 
@@ -104,15 +139,15 @@ pub fn add_offline(env: &HostEnv, name: &str) -> Result<String, String> {
 ///
 /// # 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> {
+/// 找不到、落盘失败时返回 [`AccountFailure`]。
+pub fn remove(env: &HostEnv, key: &str) -> Result<String, AccountFailure> {
     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}"))?;
+        .map_err(|error| AccountFailure::classify(error, AccountNoticeCode::NotFound))?;
     store
         .save()
-        .map_err(|error| format!("保存账户失败：{error}"))?;
+        .map_err(|error| AccountFailure::classify(error, AccountNoticeCode::StoreFailed))?;
     Ok(meta.display_name().to_string())
 }
 
@@ -147,7 +182,7 @@ pub fn start_login(env: HostEnv, tx: JobSender, job: LoginJob) {
     spawn("msa-login", move || {
         let auth = match microsoft_auth(&env) {
             Ok(auth) => auth,
-            Err(message) => return fail(&tx, message),
+            Err(message) => return fail(&tx, LoginFailure::Other, message),
         };
         let tx_prompt = tx.clone();
         let result = block_on(auth.device_code_login(|prompt| {
@@ -170,7 +205,7 @@ pub fn start_browser_login(env: HostEnv, tx: JobSender, job: LoginJob) {
     spawn("msa-authcode", move || {
         let auth = match microsoft_auth(&env) {
             Ok(auth) => auth,
-            Err(message) => return fail(&tx, message),
+            Err(message) => return fail(&tx, LoginFailure::Other, message),
         };
         let tx_prompt = tx.clone();
         let result = block_on(auth.authcode_login(|prompt| {
@@ -197,8 +232,13 @@ fn microsoft_auth(env: &HostEnv) -> Result<MicrosoftAuth, String> {
         .map_err(|error| error.to_string())
 }
 
-fn fail(tx: &JobSender, message: String) {
-    let _ = tx.send(HostTask::Login(Box::new(DeviceLoginView::failed(message))));
+/// 失败收尾（带**原因码**）：原文进日志，页面据码出 i18n（复审 r1 P1-1）。
+fn fail(tx: &JobSender, failure: LoginFailure, detail: impl Into<String>) {
+    let detail = detail.into();
+    eprintln!("[auth] 微软登录失败（{}）：{detail}", failure.code());
+    let _ = tx.send(HostTask::Login(Box::new(DeviceLoginView::failed_as(
+        failure, detail,
+    ))));
 }
 
 /// 收尾：取消就吞掉结果；成功入库；失败带 core 的诊断文案（M38 的 403 也走这条）。
@@ -213,9 +253,12 @@ fn finish(env: &HostEnv, tx: &JobSender, job: &LoginJob, result: AuthResult<Micr
                 let _ = tx.send(HostTask::Login(Box::new(DeviceLoginView::succeeded(&name))));
                 let _ = tx.send(HostTask::Accounts(accounts(env, None)));
             }
-            Err(message) => fail(tx, message),
+            Err(message) => fail(tx, LoginFailure::StoreFailed, message),
         },
-        Err(error) => fail(tx, error.to_string()),
+        Err(error) => {
+            let failure = classify(&error);
+            fail(tx, failure, error.to_string());
+        }
     }
 }
 
@@ -239,6 +282,9 @@ fn store_session(env: &HostEnv, session: MicrosoftSession) -> Result<String, Str
 #[cfg(test)]
 mod tests {
     use super::*;
+    use unlucky_core::auth::AuthError;
+
+    use super::failure::mentions_whitelist;
 
     #[test]
     fn time_display_matches_known_timestamps() {
@@ -271,6 +317,57 @@ mod tests {
         std::fs::remove_dir_all(&dir).ok();
     }
 
+    #[test]
+    fn failure_codes_are_classified_from_variants_not_chinese_text() {
+        assert_eq!(
+            classify(&AuthError::Network {
+                url: "https://x".to_string(),
+                detail: "dns".to_string()
+            }),
+            LoginFailure::Unreachable
+        );
+        assert_eq!(
+            classify(&AuthError::Denied {
+                code: "AADSTS7000218".to_string(),
+                description: "request body must contain client_assertion".to_string(),
+            }),
+            LoginFailure::NotWhitelisted
+        );
+        assert_eq!(
+            classify(&AuthError::Denied {
+                code: "invalid_grant".to_string(),
+                description: "bad".to_string(),
+            }),
+            LoginFailure::Denied
+        );
+        assert_eq!(classify(&AuthError::Canceled), LoginFailure::Other);
+        assert!(mentions_whitelist("AADSTS7000218"));
+        assert!(!mentions_whitelist("invalid_grant"));
+    }
+
+    #[test]
+    fn offline_name_rule_matches_the_ui_contract() {
+        assert!(valid_offline_name("Steve"));
+        assert!(valid_offline_name("a_1"));
+        assert!(!valid_offline_name("ab"), "太短");
+        assert!(!valid_offline_name("中文名字"), "非 ascii");
+        assert!(!valid_offline_name("has space"));
+        assert!(!valid_offline_name("x"));
+    }
+
+    #[test]
+    fn a_bad_offline_name_is_classified_not_stringified() {
+        let dir =
+            std::env::temp_dir().join(format!("ull-host-accounts-name-{}", 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 failure = add_offline(&env, "ab").expect_err("太短要报错");
+        assert_eq!(failure.code, AccountNoticeCode::OfflineNameInvalid);
+        assert!(!failure.detail.is_empty());
+        std::fs::remove_dir_all(&dir).ok();
+    }
+
     #[test]
     fn login_job_cancel_flag_is_shared() {
         let job = LoginJob::new();
diff --git a/crates/presenter/src/host/accounts/authlib.rs b/crates/presenter/src/host/accounts/authlib.rs
index e2515e9..6f708b4 100644
--- a/crates/presenter/src/host/accounts/authlib.rs
+++ b/crates/presenter/src/host/accounts/authlib.rs
@@ -22,42 +22,81 @@ use unlucky_core::auth::microsoft::now_ms;
 use unlucky_core::auth::{AccountStore, Secret};
 use unlucky_core::download::blocking::block_on;
 
-use crate::dto::{AuthlibLoginView, AuthlibRequest, SkinImage, REDACTED};
+use crate::dto::{AuthlibLoginView, AuthlibRequest, LoginFailure, SkinImage};
+
+mod util;
+
+pub use util::scrub_known;
+
+use util::{base64_decode, client_token, get_bytes, get_text};
 
-use super::super::engine;
 use super::super::env::HostEnv;
 use super::super::job::{spawn, HostTask, JobSender};
 use super::LoginJob;
 
-/// 一次 GET 的超时上限（秒）：服务器不可达时要能失败，而不是挂住 UI 的登录面板。
-const HTTP_TIMEOUT_SECS: u64 = 15;
-
 /// 校验认证服务器地址（「校验」按钮的后端）。
 ///
 /// # Errors
 ///
 /// 地址不合法、网络不可达、HTTP 非 2xx、响应不是 authlib-injector 的服务发现 JSON 时，
 /// 返回**具名**的用户可读文案（这是任务要求的「失败态 + 具名错误」）。
-pub fn probe_authlib(env: &HostEnv, input: &str) -> Result<(String, AuthlibServerMeta), String> {
-    let api_root = normalize_api_root(input).map_err(|error| error.to_string())?;
-    let (status, text) = get_text(env, &api_root)?;
+pub fn probe_authlib(env: &HostEnv, input: &str) -> Result<(String, AuthlibServerMeta), Failure> {
+    let api_root = normalize_api_root(input)
+        .map_err(|error| Failure::new(LoginFailure::Other, error.to_string()))?;
+    let (status, text) =
+        get_text(env, &api_root).map_err(|error| Failure::new(LoginFailure::Unreachable, error))?;
     if !(200..300).contains(&status) {
-        return Err(format!(
-            "服务器返回 HTTP {status}（{api_root} 不像可用的 authlib 认证服务器）"
+        return Err(Failure::new(
+            LoginFailure::NotAuthlibServer,
+            format!("服务器返回 HTTP {status}（{api_root} 不像可用的 authlib 认证服务器）"),
         ));
     }
     let value: serde_json::Value = serde_json::from_str(&text).map_err(|_| {
-        format!("响应不是 JSON：{api_root} —— 可能填成了网页地址，而不是 API 根（通常以 /api/yggdrasil/ 结尾）")
+        Failure::new(
+            LoginFailure::NotAuthlibServer,
+            format!("响应不是 JSON：{api_root} —— 可能填成了网页地址，而不是 API 根（通常以 /api/yggdrasil/ 结尾）"),
+        )
     })?;
     if value.get("meta").is_none() && value.get("skinDomains").is_none() {
-        return Err(
-            "响应里没有 meta / skinDomains：这看起来不是 authlib-injector 服务器".to_string(),
-        );
+        return Err(Failure::new(
+            LoginFailure::NotAuthlibServer,
+            "响应里没有 meta / skinDomains：这看起来不是 authlib-injector 服务器",
+        ));
     }
     let meta = AuthlibServerMeta::from_value(&value);
     Ok((api_root, meta))
 }
 
+/// 第三方轨的失败：**原因码 + 原文**（原文进日志，页面据码出 i18n）。
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Failure {
+    /// 原因码
+    pub code: LoginFailure,
+    /// 原始诊断（已脱敏）
+    pub detail: String,
+}
+
+impl Failure {
+    fn new(code: LoginFailure, detail: impl Into<String>) -> Self {
+        Self {
+            code,
+            detail: detail.into(),
+        }
+    }
+
+    /// `AuthError` → 原因码（只看变体）。
+    fn from_error(error: &unlucky_core::auth::AuthError) -> Self {
+        use unlucky_core::auth::AuthError;
+        let code = match error {
+            AuthError::Network { .. } | AuthError::Timeout { .. } => LoginFailure::Unreachable,
+            AuthError::Denied { .. } => LoginFailure::BadCredentials,
+            AuthError::Store { .. } => LoginFailure::StoreFailed,
+            _ => LoginFailure::Other,
+        };
+        Self::new(code, error.to_string())
+    }
+}
+
 /// 起一次第三方轨登录（后台线程）。
 pub fn start_login(env: HostEnv, tx: JobSender, job: LoginJob, request: AuthlibRequest) {
     spawn("authlib-login", move || {
@@ -68,7 +107,7 @@ pub fn start_login(env: HostEnv, tx: JobSender, job: LoginJob, request: AuthlibR
 
         let (api_root, meta) = match probe_authlib(&env, &request.server) {
             Ok(found) => found,
-            Err(reason) => return fail(&tx, reason),
+            Err(failure) => return fail(&tx, failure),
         };
         let server_name = meta
             .name
@@ -83,7 +122,7 @@ pub fn start_login(env: HostEnv, tx: JobSender, job: LoginJob, request: AuthlibR
 
         let auth = match AuthlibAuth::new() {
             Ok(auth) => auth,
-            Err(error) => return fail(&tx, error.to_string()),
+            Err(error) => return fail(&tx, Failure::new(LoginFailure::Other, error.to_string())),
         };
         let client_token = Secret::new(client_token());
         let password_text = std::mem::take(&mut request.password);
@@ -108,11 +147,17 @@ pub fn start_login(env: HostEnv, tx: JobSender, job: LoginJob, request: AuthlibR
                         Some(account.as_str()),
                     )));
                 }
-                Err(reason) => fail(&tx, reason),
+                Err(failure) => fail(&tx, failure),
             },
             // 错误原文里可能有服务端回显的凭据：先按**形状**脱敏（`AuthlibLoginView::failed`），
             // 再按**已知值**兜一遍（万一服务端把密码原样回显）。
-            Err(error) => fail(&tx, scrub_known(&error.to_string(), &password_text)),
+            Err(error) => {
+                let failure = Failure::from_error(&error);
+                fail(
+                    &tx,
+                    Failure::new(failure.code, scrub_known(&failure.detail, &password_text)),
+                );
+            }
         }
         drop(password_text);
     });
@@ -134,7 +179,7 @@ pub fn spawn_probe(env: HostEnv, tx: JobSender, server: String) {
                     &api_root, &name,
                 ))));
             }
-            Err(reason) => fail(&tx, reason),
+            Err(failure) => fail(&tx, failure),
         }
     });
 }
@@ -192,14 +237,12 @@ fn store(
     session: AuthlibSession,
     api_root: &str,
     login_name: &str,
-) -> Result<String, String> {
+) -> Result<String, Failure> {
     let profile = session
         .selected_profile
         .clone()
         .filter(|profile| !profile.name.trim().is_empty() && !profile.id.is_empty())
-        .ok_or_else(|| {
-            "服务器没有返回角色：这个账号可能还没在皮肤站里创建角色（建好后再试）".to_string()
-        })?;
+        .ok_or_else(|| Failure::new(LoginFailure::NoProfile, "服务器没有返回角色"))?;
     let mut meta = AccountMeta::new(
         CoreAccountKind::AuthlibInjector,
         profile.id,
@@ -213,7 +256,7 @@ fn store(
     account_store
         .insert(meta, Credentials::AuthlibInjector(session))
         .and_then(|()| account_store.save())
-        .map_err(|error| format!("账户入库失败：{error}"))?;
+        .map_err(|error| Failure::new(LoginFailure::StoreFailed, error.to_string()))?;
     Ok(name)
 }
 
@@ -225,112 +268,19 @@ fn stage(tx: &JobSender, server: &str, message: &str) {
 }
 
 /// 失败收尾：**先脱敏再上屏**（服务端错误原文里可能带 token）。
-fn fail(tx: &JobSender, message: String) {
-    let _ = tx.send(HostTask::Authlib(Box::new(AuthlibLoginView::failed(
-        message,
+/// 失败收尾：原文进日志，页面拿**原因码**（复审 r1 P1-1）。
+fn fail(tx: &JobSender, failure: Failure) {
+    eprintln!(
+        "[auth] authlib 失败（{}）：{}",
+        failure.code.code(),
+        failure.detail
+    );
+    let _ = tx.send(HostTask::Authlib(Box::new(AuthlibLoginView::failed_as(
+        failure.code,
+        failure.detail,
     ))));
 }
 
-/// 启动器侧生成的 `clientToken`（Yggdrasil 要求刷新/校验都带，且服务端回传必须一致）。
-fn client_token() -> String {
-    use std::hash::{BuildHasher, Hasher};
-    let mut out = String::with_capacity(32);
-    for salt in 0..2u64 {
-        // `RandomState` 每个实例自带随机种子（标准库给的是进程级随机），不引第三方随机库。
-        let mut hasher = std::collections::hash_map::RandomState::new().build_hasher();
-        hasher.write_u64(now_ms() ^ salt);
-        hasher.write_u32(std::process::id());
-        out.push_str(&format!("{:016x}", hasher.finish()));
-    }
-    out
-}
-
-/// GET 文本（状态码 + 正文）。
-///
-/// 客户端来自**既有的下载引擎**（`host::engine::engine`）：代理/超时/证书栈与本仓的下载器
-/// 完全同源，不在这里另起一套 HTTP 配置（本 crate 也没有 reqwest 依赖，拿到的只是它的 `&Client`）。
-fn get_text(env: &HostEnv, url: &str) -> Result<(u16, String), String> {
-    let engine = engine::engine(env);
-    let client = engine.client();
-    let url = url.to_string();
-    block_on(async move {
-        let reply = client
-            .get(&url)
-            .timeout(std::time::Duration::from_secs(HTTP_TIMEOUT_SECS))
-            .send()
-            .await
-            .map_err(|error| format!("服务器不可达：{error}"))?;
-        let status = reply.status().as_u16();
-        let text = reply
-            .text()
-            .await
-            .map_err(|error| format!("读取响应失败：{error}"))?;
-        Ok((status, text))
-    })
-}
-
-/// GET 字节（皮肤图片）。
-fn get_bytes(env: &HostEnv, url: &str) -> Result<(u16, Vec<u8>), String> {
-    let engine = engine::engine(env);
-    let client = engine.client();
-    let url = url.to_string();
-    block_on(async move {
-        let reply = client
-            .get(&url)
-            .timeout(std::time::Duration::from_secs(HTTP_TIMEOUT_SECS))
-            .send()
-            .await
-            .map_err(|error| format!("皮肤图片不可达：{error}"))?;
-        let status = reply.status().as_u16();
-        let bytes = reply
-            .bytes()
-            .await
-            .map_err(|error| format!("读取皮肤图片失败：{error}"))?
-            .to_vec();
-        Ok((status, bytes))
-    })
-}
-
-/// base64 解码（标准字母表，容忍 URL-safe 变体与缺失填充）。
-///
-/// 为什么自己写：textures 属性是 base64 编码的 JSON，而本 crate 不能引第三方解码库
-/// （依赖最小化）；这段是 40 行的确定性算法，配单测比拖一个依赖更划算。
-fn base64_decode(input: &str) -> Result<Vec<u8>, String> {
-    let mut out = Vec::with_capacity(input.len() / 4 * 3);
-    let mut buffer: u32 = 0;
-    let mut bits = 0u32;
-    for byte in input.bytes() {
-        let value = match byte {
-            b'A'..=b'Z' => byte - b'A',
-            b'a'..=b'z' => byte - b'a' + 26,
-            b'0'..=b'9' => byte - b'0' + 52,
-            b'+' | b'-' => 62,
-            b'/' | b'_' => 63,
-            b'=' | b'\n' | b'\r' | b' ' => continue,
-            other => return Err(format!("base64 里有非法字符：{:?}", other as char)),
-        };
-        buffer = (buffer << 6) | u32::from(value);
-        bits += 6;
-        if bits >= 8 {
-            bits -= 8;
-            out.push(u8::try_from((buffer >> bits) & 0xFF).unwrap_or(0));
-        }
-    }
-    if out.is_empty() {
-        return Err("base64 内容为空".to_string());
-    }
-    Ok(out)
-}
-
-/// 错误文案里可能混进已知凭据值：按值再兜一遍（形状脱敏由 `AuthlibLoginView::failed` 做）。
-#[must_use]
-pub fn scrub_known(message: &str, secret: &str) -> String {
-    if secret.is_empty() {
-        return message.to_string();
-    }
-    message.replace(secret, REDACTED)
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -361,6 +311,8 @@ mod tests {
         assert!(a.chars().all(|c| c.is_ascii_hexdigit()));
     }
 
+    use crate::dto::REDACTED;
+
     #[test]
     fn known_secret_is_scrubbed_from_error_text() {
         let text = scrub_known("登录失败：hunter2 被拒绝", "hunter2");
@@ -376,10 +328,10 @@ mod tests {
         let _ = std::fs::remove_dir_all(&dir);
         let env = HostEnv::at_root(&dir);
         std::fs::create_dir_all(env.layout.cache()).expect("cache");
-        let error = probe_authlib(&env, "   ").expect_err("空地址必须报错");
-        assert!(error.contains("不能为空"), "{error}");
-        let error = probe_authlib(&env, "https://").expect_err("只给协议头也必须报错");
-        assert!(!error.is_empty());
+        let failure = probe_authlib(&env, "   ").expect_err("空地址必须报错");
+        assert!(failure.detail.contains("不能为空"), "{failure:?}");
+        let failure = probe_authlib(&env, "https://").expect_err("只给协议头也必须报错");
+        assert!(!failure.detail.is_empty());
         std::fs::remove_dir_all(&dir).ok();
     }
 }
diff --git a/crates/presenter/src/host/accounts/authlib/util.rs b/crates/presenter/src/host/accounts/authlib/util.rs
new file mode 100644
index 0000000..fdba67d
--- /dev/null
+++ b/crates/presenter/src/host/accounts/authlib/util.rs
@@ -0,0 +1,129 @@
+//! authlib 轨的 HTTP 基座与纯函数小工具：`clientToken` 生成、GET 文本/字节、base64 解码、按已知值脱敏。
+//!
+//! 从 `authlib.rs` 拆出来守 400 行硬线。网络只走**既有下载引擎**的客户端
+//! （`host::engine::engine(env).client()`）：代理/超时/证书栈与下载器同源，本 crate 不新增依赖。
+
+use unlucky_core::auth::microsoft::now_ms;
+use unlucky_core::download::blocking::block_on;
+
+use crate::dto::REDACTED;
+
+use super::super::super::engine;
+use super::super::super::env::HostEnv;
+
+/// 一次 GET 的超时上限（秒）：服务器不可达时要能失败，而不是挂住 UI 的登录面板。
+pub(super) const HTTP_TIMEOUT_SECS: u64 = 15;
+
+/// 单次 GET 的响应体上限（字节）：用户能填任意 URL，服务发现 JSON/皮肤 PNG 都远小于它。
+pub(super) const MAX_BODY_BYTES: usize = 512 * 1024;
+/// base64 解码输出上限（textures 属性是个小 JSON）。
+pub(super) const MAX_BASE64_BYTES: usize = 64 * 1024;
+
+/// 启动器侧生成的 `clientToken`（Yggdrasil 要求刷新/校验都带，且服务端回传必须一致）。
+pub(super) fn client_token() -> String {
+    use std::hash::{BuildHasher, Hasher};
+    let mut out = String::with_capacity(32);
+    for salt in 0..2u64 {
+        // `RandomState` 每个实例自带随机种子（标准库给的是进程级随机），不引第三方随机库。
+        let mut hasher = std::collections::hash_map::RandomState::new().build_hasher();
+        hasher.write_u64(now_ms() ^ salt);
+        hasher.write_u32(std::process::id());
+        out.push_str(&format!("{:016x}", hasher.finish()));
+    }
+    out
+}
+
+/// GET 文本（状态码 + 正文）。
+///
+/// 客户端来自**既有的下载引擎**（`host::engine::engine`）：代理/超时/证书栈与本仓的下载器
+/// 完全同源，不在这里另起一套 HTTP 配置（本 crate 也没有 reqwest 依赖，拿到的只是它的 `&Client`）。
+pub(super) fn get_text(env: &HostEnv, url: &str) -> Result<(u16, String), String> {
+    let engine = engine::engine(env);
+    let client = engine.client();
+    let url = url.to_string();
+    block_on(async move {
+        let reply = client
+            .get(&url)
+            .timeout(std::time::Duration::from_secs(HTTP_TIMEOUT_SECS))
+            .send()
+            .await
+            .map_err(|error| format!("服务器不可达：{error}"))?;
+        let status = reply.status().as_u16();
+        let text = reply
+            .text()
+            .await
+            .map_err(|error| format!("读取响应失败：{error}"))?;
+        Ok((status, text))
+    })
+}
+
+/// GET 字节（皮肤图片）。
+pub(super) fn get_bytes(env: &HostEnv, url: &str) -> Result<(u16, Vec<u8>), String> {
+    let engine = engine::engine(env);
+    let client = engine.client();
+    let url = url.to_string();
+    block_on(async move {
+        let reply = client
+            .get(&url)
+            .timeout(std::time::Duration::from_secs(HTTP_TIMEOUT_SECS))
+            .send()
+            .await
+            .map_err(|error| format!("皮肤图片不可达：{error}"))?;
+        let status = reply.status().as_u16();
+        let bytes = reply
+            .bytes()
+            .await
+            .map_err(|error| format!("读取皮肤图片失败：{error}"))?
+            .to_vec();
+        if bytes.len() > MAX_BODY_BYTES {
+            return Err(format!(
+                "图片过大（{} 字节，上限 {MAX_BODY_BYTES}）",
+                bytes.len()
+            ));
+        }
+        Ok((status, bytes))
+    })
+}
+
+/// base64 解码（标准字母表，容忍 URL-safe 变体与缺失填充）。
+///
+/// 为什么自己写：textures 属性是 base64 编码的 JSON，而本 crate 不能引第三方解码库
+/// （依赖最小化）；这段是 40 行的确定性算法，配单测比拖一个依赖更划算。
+pub(super) fn base64_decode(input: &str) -> Result<Vec<u8>, String> {
+    let mut out = Vec::with_capacity(input.len() / 4 * 3);
+    let mut buffer: u32 = 0;
+    let mut bits = 0u32;
+    for byte in input.bytes() {
+        let value = match byte {
+            b'A'..=b'Z' => byte - b'A',
+            b'a'..=b'z' => byte - b'a' + 26,
+            b'0'..=b'9' => byte - b'0' + 52,
+            b'+' | b'-' => 62,
+            b'/' | b'_' => 63,
+            b'=' | b'\n' | b'\r' | b' ' => continue,
+            other => return Err(format!("base64 里有非法字符：{:?}", other as char)),
+        };
+        buffer = (buffer << 6) | u32::from(value);
+        bits += 6;
+        if bits >= 8 {
+            bits -= 8;
+            out.push(u8::try_from((buffer >> bits) & 0xFF).unwrap_or(0));
+        }
+        if out.len() > MAX_BASE64_BYTES {
+            return Err(format!("base64 输出超过上限 {MAX_BASE64_BYTES} 字节"));
+        }
+    }
+    if out.is_empty() {
+        return Err("base64 内容为空".to_string());
+    }
+    Ok(out)
+}
+
+/// 错误文案里可能混进已知凭据值：按值再兜一遍（形状脱敏由 `AuthlibLoginView::failed` 做）。
+#[must_use]
+pub fn scrub_known(message: &str, secret: &str) -> String {
+    if secret.is_empty() {
+        return message.to_string();
+    }
+    message.replace(secret, REDACTED)
+}
diff --git a/crates/presenter/src/host/accounts/failure.rs b/crates/presenter/src/host/accounts/failure.rs
new file mode 100644
index 0000000..637a942
--- /dev/null
+++ b/crates/presenter/src/host/accounts/failure.rs
@@ -0,0 +1,76 @@
+//! 账户写操作的失败分类 + 离线名字契约（M114 r2）。
+//!
+//! 分类**只看 `AuthError` 的变体与 ascii 码**，不看中文文案——文案随时会改，
+//! 而页面据 `AccountNoticeCode` 选 i18n，两边必须能独立演进。
+
+use unlucky_core::auth::AuthError;
+
+use crate::dto::{AccountNoticeCode, LoginFailure};
+
+/// 账户写操作的失败：**结构化码 + 原文**（原文只进日志/详细信息，不上屏）。
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct AccountFailure {
+    /// 结果码（页面据此选 i18n）
+    pub code: AccountNoticeCode,
+    /// 原始诊断（已脱敏）
+    pub detail: String,
+}
+
+impl AccountFailure {
+    /// 按 core 的错误类型分类（不看中文文案，只看变体）。
+    pub(super) fn classify(error: AuthError, fallback: AccountNoticeCode) -> Self {
+        let code = match &error {
+            unlucky_core::auth::AuthError::Conflict { .. } => AccountNoticeCode::AccountExists,
+            unlucky_core::auth::AuthError::NotFound { .. } => AccountNoticeCode::NotFound,
+            unlucky_core::auth::AuthError::Malformed(_) => AccountNoticeCode::OfflineNameInvalid,
+            unlucky_core::auth::AuthError::Store { .. } => AccountNoticeCode::StoreFailed,
+            _ => fallback,
+        };
+        Self {
+            code,
+            detail: error.to_string(),
+        }
+    }
+}
+
+/// 离线名字的界面契约（3–16 位 ascii 字母/数字/下划线）。core 侧还有一道同名规则做兜底。
+#[must_use]
+pub fn valid_offline_name(name: &str) -> bool {
+    let len = name.chars().count();
+    (3..=16).contains(&len) && name.chars().all(|c| c.is_ascii_alphanumeric() || c == '_')
+}
+
+/// `AuthError` → 原因码（**只看变体与 ascii 码，不看中文文案**）。
+pub(super) fn classify(error: &AuthError) -> LoginFailure {
+    match error {
+        AuthError::Network { .. } | AuthError::Timeout { .. } => LoginFailure::Unreachable,
+        AuthError::Denied { code, description } => {
+            if mentions_whitelist(code) || mentions_whitelist(description) {
+                LoginFailure::NotWhitelisted
+            } else {
+                LoginFailure::Denied
+            }
+        }
+        AuthError::Response(detail) => {
+            let blob = format!("{detail:?}");
+            if mentions_whitelist(&blob) {
+                LoginFailure::NotWhitelisted
+            } else {
+                LoginFailure::Denied
+            }
+        }
+        AuthError::Xbox { .. } | AuthError::CredentialExpired => LoginFailure::Denied,
+        AuthError::Store { .. } => LoginFailure::StoreFailed,
+        _ => LoginFailure::Other,
+    }
+}
+
+/// 是否属于「应用注册未获批」这一类（AADSTS7000218 / consent required / whitelist）。
+pub(super) fn mentions_whitelist(text: &str) -> bool {
+    let lowered = text.to_lowercase();
+    lowered.contains("aadsts7000218")
+        || lowered.contains("aadsts65001")
+        || lowered.contains("consent")
+        || lowered.contains("whitelist")
+        || lowered.contains("not approved")
+}
diff --git a/crates/presenter/src/host/dispatch.rs b/crates/presenter/src/host/dispatch.rs
index 6bf3c60..533f15c 100644
--- a/crates/presenter/src/host/dispatch.rs
+++ b/crates/presenter/src/host/dispatch.rs
@@ -2,7 +2,9 @@
 //!
 //! 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, PackEvent};
+use crate::dto::{
+    AccountNoticeCode, AppCommand, Backend, CoreEvent, CreateRequest, LoaderKind, PackEvent,
+};
 use crate::toast::ToastKind;
 
 use super::accounts::{self, LoginJob};
@@ -107,27 +109,43 @@ impl CoreHost {
                 }
                 Err(reason) => self.toast(ToastKind::Warn, reason),
             },
+            // 账户增删切：结果走**页面横幅**（`AccountNoticeChanged`），不发 toast——
+            // app-iced 不渲染 toast，发出去等于用户什么都看不到（复审 r1 P2-2）。
             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.notice(AccountNoticeCode::Added, &display, "");
+                    self.refresh_accounts();
+                }
+                Err(failure) => {
+                    self.notice_failure(failure, &name);
                     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.notice(AccountNoticeCode::Removed, &display, "");
+                    self.refresh_accounts();
+                }
+                Err(failure) => {
+                    self.notice_failure(failure, &key);
                     self.refresh_accounts();
                 }
-                Err(reason) => self.toast(ToastKind::Error, reason),
             },
             AppCommand::SwitchAccount(id) => {
+                let name = self
+                    .accounts
+                    .iter()
+                    .find(|account| account.id == id)
+                    .map_or_else(|| id.clone(), |account| account.name.clone());
                 self.active_account = Some(id);
                 self.refresh_accounts();
-                self.toast(ToastKind::Info, "已切换启动账户");
+                self.notice(AccountNoticeCode::Switched, &name, "");
+            }
+            AppCommand::DismissAccountNotice => {
+                self.send(CoreEvent::AccountNoticeChanged(None));
             }
             AppCommand::StartDeviceLogin => {
                 self.login = Some(LoginJob::new());
diff --git a/crates/presenter/src/mock.rs b/crates/presenter/src/mock.rs
index 856f419..3376f88 100644
--- a/crates/presenter/src/mock.rs
+++ b/crates/presenter/src/mock.rs
@@ -80,6 +80,11 @@ impl MockBackend {
         if let Some(view) = accounts_screen::device_login(&scenario) {
             self.emit(AppEvent::Core(CoreEvent::DeviceLoginChanged(view)));
         }
+        if let Some(notice) = accounts_screen::notice(&scenario) {
+            self.emit(AppEvent::Core(CoreEvent::AccountNoticeChanged(Some(
+                notice,
+            ))));
+        }
     }
 
     fn emit(&mut self, event: AppEvent) {
diff --git a/crates/presenter/src/mock/accounts.rs b/crates/presenter/src/mock/accounts.rs
index 5439dad..91772ce 100644
--- a/crates/presenter/src/mock/accounts.rs
+++ b/crates/presenter/src/mock/accounts.rs
@@ -11,7 +11,9 @@
 //! - **不造皮肤字节**：第三方轨的真图来自服务器，mock 里没有（伪造一张「假皮肤」正好违反
 //!   M114 的口径）。所以截图里皮肤区显示的是首字母块 + 「没有可用皮肤」。
 
-use crate::dto::{AccountKind, AccountView, DeviceLoginView};
+use crate::dto::{
+    AccountKind, AccountNotice, AccountNoticeCode, AccountView, DeviceLoginView, LoginFailure,
+};
 
 /// 场景名（`ULL_ACCOUNT_STATE`；未知值按 `list` 处理）。
 pub(super) fn scenario() -> String {
@@ -69,13 +71,28 @@ pub(super) fn device_login(scenario: &str) -> Option<DeviceLoginView> {
             900,
             "",
         )),
-        "failed" => Some(DeviceLoginView::failed(
+        // 带**原因码**的失败：原文（中文诊断）留在 detail 里只进日志，页面画 i18n + Code
+        "failed" => Some(DeviceLoginView::failed_as(
+            LoginFailure::NotWhitelisted,
             "微软拒绝了这次登录：AADSTS7000218（HTTP 403）—— 应用白名单还没批准，或网络被拦截",
         )),
         _ => None,
     }
 }
 
+/// 场景对应的横幅（`notice` = 离线名字不合法那条；`added` = 添加成功的正向样例）。
+pub(super) fn notice(scenario: &str) -> Option<AccountNotice> {
+    match scenario {
+        "notice" => Some(AccountNotice::new(
+            AccountNoticeCode::OfflineNameInvalid,
+            "ab",
+            "离线名字必须是 3–16 位字母/数字/下划线",
+        )),
+        "added" => Some(AccountNotice::new(AccountNoticeCode::Added, "Alex", "")),
+        _ => None,
+    }
+}
+
 #[allow(clippy::too_many_arguments)]
 fn account(
     id: &str,
diff --git a/crates/presenter/src/state.rs b/crates/presenter/src/state.rs
index b521911..2513378 100644
--- a/crates/presenter/src/state.rs
+++ b/crates/presenter/src/state.rs
@@ -92,6 +92,8 @@ pub struct AppState {
     pub authlib_login: AuthlibLoginView,
     /// 设备码等待态的开始时刻（倒计时；`None` = 没有在等）
     pub device_login_started: Option<std::time::Instant>,
+    /// 账户页横幅（一次性操作结果；页面渲染后由用户关掉）
+    pub account_notice: Option<crate::dto::AccountNotice>,
     /// 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）
@@ -155,6 +157,7 @@ impl AppState {
             device_login: DeviceLoginView::new(),
             authlib_login: AuthlibLoginView::new(),
             device_login_started: None,
+            account_notice: None,
             java: JavaPageView::new(),
             install: None,
             install_cancelled: 0,
@@ -254,6 +257,7 @@ impl AppState {
             CoreEvent::AccountsChanged(accounts) => self.accounts = accounts,
             CoreEvent::DeviceLoginChanged(view) => self.apply_device_login(view),
             CoreEvent::AuthlibLoginChanged(view) => self.apply_authlib_login(view),
+            CoreEvent::AccountNoticeChanged(notice) => self.account_notice = notice,
             CoreEvent::JavaChanged(page) => self.java = page,
             CoreEvent::InstallProgress(progress) => match progress {
                 Some(progress) => {
diff --git a/crates/presenter/src/state/accounts.rs b/crates/presenter/src/state/accounts.rs
index d1a4583..df78016 100644
--- a/crates/presenter/src/state/accounts.rs
+++ b/crates/presenter/src/state/accounts.rs
@@ -6,7 +6,6 @@
 use std::time::Instant;
 
 use crate::dto::{AccountView, AuthlibLoginView, DeviceLoginPhase, DeviceLoginView, REDACTED};
-use crate::toast::ToastKind;
 
 use super::AppState;
 
@@ -19,14 +18,13 @@ impl AppState {
     pub fn apply_device_login(&mut self, mut view: DeviceLoginView) {
         view.message = crate::dto::redact(&view.message);
         view.account_name = crate::dto::redact(&view.account_name);
+        // 这里**不发 toast**：presenter 是共享宿主层，写什么语言都不对（复审 r1 P1-1）。
+        // 成败反馈由页面自己画（登录面板的 Succeeded/Failed 态 + 账户页横幅），文案走 i18n。
         match view.phase {
             DeviceLoginPhase::Succeeded => {
-                self.toasts
-                    .push(ToastKind::Success, format!("已登录：{}", view.account_name));
                 self.device_login_started = None;
             }
             DeviceLoginPhase::Failed => {
-                self.toasts.push(ToastKind::Error, view.message.clone());
                 self.device_login_started = None;
             }
             DeviceLoginPhase::Waiting => {
@@ -48,16 +46,7 @@ impl AppState {
     pub fn apply_authlib_login(&mut self, mut view: AuthlibLoginView) {
         view.message = crate::dto::redact(&view.message);
         view.server_name = crate::dto::redact(&view.server_name);
-        match view.phase {
-            DeviceLoginPhase::Succeeded => {
-                self.toasts
-                    .push(ToastKind::Success, format!("已登录：{}", view.account_name));
-            }
-            DeviceLoginPhase::Failed => {
-                self.toasts.push(ToastKind::Error, view.message.clone());
-            }
-            _ => {}
-        }
+        // 同 `apply_device_login`：不发 toast，成败由页面按 i18n 画。
         self.authlib_login = view;
     }