fix(app-iced, presenter): M114 r2 —— 登录失败走结构化错误码 + i18n，修 4 条 p2 与 3 条看图意见

p1（语言泄漏）：后端诊断串不再上屏
- presenter 新增 LoginFailure 原因码（denied / whitelist_pending / unreachable /
  not_authlib_server / bad_credentials / no_profile / store_failed / other）
- 页面按码查 i18n 出标题+正文+「Code: …」，原文只进日志/详细信息
- 进行中（Requesting）也走 i18n，不再复读后端中文状态串
- presenter/state 不再发中文 toast（成败由页面按 i18n 画）
- 新增守门测试：注入带 AADSTS 的失败事件，断言英文视图无 CJK 且含 code

p2-1 复制：on_account 返回 Task，page_messages 把 iced::clipboard::write 交回 runtime
p2-2 可见失败态：新增 AccountNotice（added/removed/switched/名字非法/重名/落盘失败/
      找不到），页面用 M3 内联 alert 画（不是 toast）；离线名字先按 3–16 位规则校验，
      失败不再清空输入
p2-3 重新登录按账户类型分派：微软→授权码流；第三方→预填服务器/登录名并提示补密码；
      离线→明确说明没有可重登的服务器账户
p2-4 入口收敛：删 chip 行；空态=三卡片；有账号时三卡收进 Add an account（按钮不再绑死微软轨）

看图意见/tower 三条：
- 失败横幅改成 M3 alert（SurfaceContainerHigh + 描边，errorContainer 只作图标块，
  不再通栏实心红）；色值本身经复审像素采样确认是 90/30 档，未改角色
- 当前账户卡补齐与列表一致的「服务器/登录名」行；无皮肤时明说 No skin available
- 页面级 scrollable 加 8px 右 gutter，滚动条不再压卡片
- 倒计时改 mm:ss（15:00 left），数字与冒号语言无关

p3（顺带）：AuthlibRequest / Form 手写 Debug 脱敏密码；HTTP 响应体与 base64 输出加上限；
离线提示文案与行为对齐；删除无人使用的 key；皮肤测试断言帽子层真的 blend

测试：app-iced lib 418 绿、presenter 151 / i18n 24 绿（workspace 全量另跑）

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`，