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/test/features/auth/presentation/bloc/auth_bloc_test.dart

@@ -32,7 +32,10 @@ void main() {
         return authBloc;
       },
       act: (bloc) => bloc.add(AuthStarted()),
-      expect: () => [AuthLoading(), AuthUnauthenticated()],
+      expect: () => [
+        AuthLoading(),
+        const AuthUnauthenticated(reason: AuthUnauthenticatedReason.signedOut),
+      ],
     );
 
     blocTest<AuthBloc, AuthState>(
@@ -65,11 +68,38 @@ void main() {
         when(
           () => mockRepository.refreshSession('expired_refresh'),
         ).thenThrow(Exception('Invalid refresh token'));
-        when(() => mockRepository.deleteSession()).thenAnswer((_) async {});
+        when(
+          () => mockRepository.clearSessionLocalOnly(),
+        ).thenAnswer((_) async {});
         return authBloc;
       },
       act: (bloc) => bloc.add(AuthStarted()),
-      expect: () => [AuthLoading(), AuthUnauthenticated()],
+      expect: () => [
+        AuthLoading(),
+        const AuthUnauthenticated(
+          reason: AuthUnauthenticatedReason.startupRecoveryFailed,
+        ),
+      ],
+    );
+
+    blocTest<AuthBloc, AuthState>(
+      'emits startupRecoveryFailed when storage read throws',
+      build: () {
+        when(
+          () => mockRepository.getRefreshToken(),
+        ).thenThrow(Exception('storage failed'));
+        when(
+          () => mockRepository.clearSessionLocalOnly(),
+        ).thenAnswer((_) async {});
+        return authBloc;
+      },
+      act: (bloc) => bloc.add(AuthStarted()),
+      expect: () => [
+        AuthLoading(),
+        const AuthUnauthenticated(
+          reason: AuthUnauthenticatedReason.startupRecoveryFailed,
+        ),
+      ],
     );
 
     blocTest<AuthBloc, AuthState>(
@@ -93,7 +123,30 @@ void main() {
         user: const AuthUser(id: '1', email: 'test@example.com'),
       ),
       act: (bloc) => bloc.add(AuthLoggedOut()),
-      expect: () => [AuthUnauthenticated()],
+      expect: () => [
+        const AuthUnauthenticated(reason: AuthUnauthenticatedReason.signedOut),
+      ],
+    );
+
+    blocTest<AuthBloc, AuthState>(
+      'emits expired unauthenticated when session invalidated',
+      build: () {
+        when(
+          () => mockRepository.clearSessionLocalOnly(),
+        ).thenAnswer((_) async {});
+        return authBloc;
+      },
+      seed: () => AuthAuthenticated(
+        user: const AuthUser(id: '1', email: 'test@example.com'),
+      ),
+      act: (bloc) => bloc.add(
+        const AuthSessionInvalidated(
+          source: AuthInvalidationSource.unauthorized401,
+        ),
+      ),
+      expect: () => [
+        const AuthUnauthenticated(reason: AuthUnauthenticatedReason.expired),
+      ],
     );
   });
 }