feat: 实现 Auth 全局状态机与 401 统一处理机制

- 新增 AuthSessionInvalidated 事件处理 token 失效场景
- ApiInterceptor 新增 authFailureCallback 单飞机制
- AuthBloc 区分 manual logout 与 auto expiry 语义
- 新增 startup recovery fallback 防止启动卡死

feat: 重构 Calendar DayWeek 视图事件布局引擎

- 新增 DayEventLayoutEngine 解耦事件计算与渲染
- 新增 DayTimelineMetrics 统一时间轴常量
- 新增 DayViewScale 支持捏合缩放

feat: 新增 Settings 页面共享 UI 组件

- 新增 BackTitlePageHeader 统一页面 header
- 新增 DetailHeaderActionMenu 统一操作菜单
- 新增 DestructiveActionSheet 统一删除确认
- 新增 AppToggleSwitch 统一开关组件

feat: Chat UI Schema 支持导航操作

- 支持 navigation 类型 action 触发内部路由跳转
- 新增路径验证与参数处理

chore: 更新相关测试覆盖 auth 失效路径

apps/lib/features/todo/ui/screens/todo_detail_screen.dart

@@ -4,13 +4,17 @@ import 'package:lucide_icons/lucide_icons.dart';
 import '../../../../core/di/injection.dart';
 import '../../../../core/theme/design_tokens.dart';
 import '../../../../shared/widgets/app_loading_indicator.dart';
-import '../../../../shared/widgets/page_header.dart' as widgets;
+import '../../../../shared/widgets/back_title_page_header.dart';
+import '../../../../shared/widgets/detail_header_action_menu.dart';
+import '../../../../shared/widgets/destructive_action_sheet.dart';
 import '../../../../shared/widgets/app_button.dart';
 import '../../../../shared/widgets/toast/toast.dart';
 import '../../../../shared/widgets/toast/toast_type.dart';
 import '../../../calendar/data/calendar_api.dart';
 import '../../data/todo_api.dart';
 
+enum _TodoHeaderAction { edit, delete }
+
 class TodoDetailScreen extends StatefulWidget {
   final String todoId;
 
@@ -87,8 +91,9 @@ class _TodoDetailScreenState extends State<TodoDetailScreen> {
       backgroundColor: AppColors.todoBg,
       body: SafeArea(
         child: Column(
+          crossAxisAlignment: CrossAxisAlignment.stretch,
           children: [
-            _buildHeader(context),
+            _buildHeader(),
             Expanded(child: _buildContent()),
           ],
         ),
@@ -96,39 +101,47 @@ class _TodoDetailScreenState extends State<TodoDetailScreen> {
     );
   }
 
-  Widget _buildHeader(BuildContext context) {
-    return SizedBox(
-      height: 64,
-      child: Padding(
-        padding: const EdgeInsets.only(left: 16, right: 16, top: 12, bottom: 8),
-        child: Row(
-          children: [
-            widgets.BackButton(onPressed: () => Navigator.of(context).pop()),
-            const Spacer(),
-            if (_todo != null) ...[
-              IconButton(
-                onPressed: _editTodo,
-                icon: const Icon(
-                  LucideIcons.pencil,
-                  size: 20,
-                  color: AppColors.slate600,
-                ),
-              ),
-              IconButton(
-                onPressed: _deleteTodo,
-                icon: const Icon(
-                  LucideIcons.trash2,
-                  size: 20,
-                  color: Colors.red,
-                ),
-              ),
-            ],
-          ],
-        ),
-      ),
+  Widget _buildHeader() {
+    return BackTitlePageHeader(
+      title: '待办详情',
+      onBack: () => context.pop(),
+      trailing: _buildHeaderMenu(),
     );
   }
 
+  Widget? _buildHeaderMenu() {
+    if (_todo == null) {
+      return null;
+    }
+    return DetailHeaderActionMenu<_TodoHeaderAction>(
+      items: const [
+        DetailHeaderActionItem<_TodoHeaderAction>(
+          value: _TodoHeaderAction.edit,
+          label: '编辑',
+          icon: LucideIcons.pencil,
+        ),
+        DetailHeaderActionItem<_TodoHeaderAction>(
+          value: _TodoHeaderAction.delete,
+          label: '删除',
+          icon: LucideIcons.trash2,
+          isDestructive: true,
+        ),
+      ],
+      onSelected: _handleHeaderAction,
+    );
+  }
+
+  void _handleHeaderAction(_TodoHeaderAction action) {
+    switch (action) {
+      case _TodoHeaderAction.edit:
+        _editTodo();
+        return;
+      case _TodoHeaderAction.delete:
+        _deleteTodo();
+        return;
+    }
+  }
+
   Widget _buildContent() {
     if (_isLoading) {
       return const Center(child: AppLoadingIndicator(size: 22));
@@ -382,22 +395,11 @@ class _TodoDetailScreenState extends State<TodoDetailScreen> {
   }
 
   void _deleteTodo() async {
-    final confirm = await showDialog<bool>(
-      context: context,
-      builder: (context) => AlertDialog(
-        title: const Text('确认删除'),
-        content: const Text('确定要删除这个待办吗？'),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.of(context).pop(false),
-            child: const Text('取消'),
-          ),
-          TextButton(
-            onPressed: () => Navigator.of(context).pop(true),
-            child: const Text('删除', style: TextStyle(color: Colors.red)),
-          ),
-        ],
-      ),
+    final confirm = await showDestructiveActionSheet(
+      context,
+      title: '删除待办',
+      message: '确定要删除这个待办吗？',
+      confirmText: '确认删除',
     );
 
     if (confirm == true) {