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_quadrants_screen.dart

@@ -8,6 +8,7 @@ import '../../../../shared/widgets/app_loading_indicator.dart';
 import '../../../../shared/widgets/app_pull_refresh_feedback.dart';
 import '../../../../shared/widgets/app_pressable.dart';
 import '../../../../shared/widgets/app_sheet_input_field.dart';
+import '../../../../shared/widgets/back_title_page_header.dart';
 import '../../../../shared/widgets/toast/toast.dart';
 import '../../../../shared/widgets/toast/toast_type.dart';
 import '../../../calendar/data/calendar_api.dart';
@@ -167,74 +168,57 @@ class _TodoQuadrantsScreenState extends State<TodoQuadrantsScreen> {
   }
 
   Widget _buildHeader() {
-    return SizedBox(
-      height: 72,
-      child: Padding(
-        padding: const EdgeInsets.only(left: 16, right: 16, top: 14, bottom: 8),
-        child: Row(
-          mainAxisAlignment: MainAxisAlignment.spaceBetween,
-          crossAxisAlignment: CrossAxisAlignment.center,
-          children: [
-            const Text(
-              '待办事项',
-              style: TextStyle(
-                fontFamily: 'Inter',
-                fontSize: 22,
-                fontWeight: FontWeight.w700,
-                color: AppColors.slate900,
+    return BackTitlePageHeader(
+      title: '待办事项',
+      showBackButton: false,
+      trailing: Row(
+        mainAxisSize: MainAxisSize.min,
+        crossAxisAlignment: CrossAxisAlignment.center,
+        children: [
+          AppPressable(
+            borderRadius: BorderRadius.circular(AppRadius.full),
+            onTap: _loadTodos,
+            child: Container(
+              width: 36,
+              height: 36,
+              decoration: BoxDecoration(
+                color: AppColors.messageBtnWrap,
+                borderRadius: BorderRadius.circular(AppRadius.full),
+                border: Border.all(color: AppColors.messageBtnBorder),
+              ),
+              child: const Icon(
+                LucideIcons.refreshCcw,
+                size: 18,
+                color: AppColors.slate600,
               ),
             ),
-            Row(
-              mainAxisSize: MainAxisSize.min,
-              crossAxisAlignment: CrossAxisAlignment.center,
-              children: [
-                AppPressable(
-                  borderRadius: BorderRadius.circular(AppRadius.full),
-                  onTap: _loadTodos,
-                  child: Container(
-                    width: 36,
-                    height: 36,
-                    decoration: BoxDecoration(
-                      color: AppColors.messageBtnWrap,
-                      borderRadius: BorderRadius.circular(AppRadius.full),
-                      border: Border.all(color: AppColors.messageBtnBorder),
-                    ),
-                    child: const Icon(
-                      LucideIcons.refreshCcw,
-                      size: 18,
-                      color: AppColors.slate600,
-                    ),
+          ),
+          const SizedBox(width: AppSpacing.sm),
+          AppPressable(
+            borderRadius: BorderRadius.circular(AppRadius.full),
+            onTap: _addTodo,
+            child: Container(
+              width: 36,
+              height: 36,
+              decoration: BoxDecoration(
+                color: AppColors.blue600,
+                borderRadius: BorderRadius.circular(AppRadius.full),
+                boxShadow: [
+                  BoxShadow(
+                    color: AppColors.blue300.withValues(alpha: 0.28),
+                    blurRadius: AppRadius.lg,
+                    offset: const Offset(0, AppSpacing.xs),
                   ),
-                ),
-                const SizedBox(width: AppSpacing.sm),
-                AppPressable(
-                  borderRadius: BorderRadius.circular(AppRadius.full),
-                  onTap: _addTodo,
-                  child: Container(
-                    width: 36,
-                    height: 36,
-                    decoration: BoxDecoration(
-                      color: AppColors.blue600,
-                      borderRadius: BorderRadius.circular(AppRadius.full),
-                      boxShadow: [
-                        BoxShadow(
-                          color: AppColors.blue300.withValues(alpha: 0.28),
-                          blurRadius: AppRadius.lg,
-                          offset: const Offset(0, AppSpacing.xs),
-                        ),
-                      ],
-                    ),
-                    child: const Icon(
-                      LucideIcons.plus,
-                      size: 18,
-                      color: AppColors.white,
-                    ),
-                  ),
-                ),
-              ],
+                ],
+              ),
+              child: const Icon(
+                LucideIcons.plus,
+                size: 18,
+                color: AppColors.white,
+              ),
             ),
-          ],
-        ),
+          ),
+        ],
       ),
     );
   }
@@ -395,9 +379,9 @@ class _TodoQuadrantsScreenState extends State<TodoQuadrantsScreen> {
         final dateStr =
             '${date.year}-${date.month.toString().padLeft(2, '0')}-${date.day.toString().padLeft(2, '0')}';
         if (viewType == CalendarViewType.month) {
-          context.push('/calendar/month');
+          context.go('/calendar/month');
         } else {
-          context.push('/calendar/dayweek?date=$dateStr');
+          context.go('/calendar/dayweek?date=$dateStr');
         }
       },
       onHomeTap: () => context.go('/home'),