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/settings/ui/screens/settings_screen.dart

@@ -4,13 +4,13 @@ import 'package:social_app/core/constants/app_constants.dart';
 import 'package:social_app/core/di/injection.dart';
 import 'package:social_app/core/theme/design_tokens.dart';
 import 'package:social_app/shared/widgets/app_loading_indicator.dart';
-import 'package:social_app/shared/widgets/page_header.dart' as widgets;
 import 'package:social_app/shared/widgets/toast/toast.dart';
 import 'package:social_app/shared/widgets/toast/toast_type.dart';
 import 'package:social_app/features/friends/data/friends_api.dart';
 import 'package:social_app/features/settings/data/settings_api.dart';
 import 'package:social_app/features/users/data/models/user_response.dart';
 import 'package:social_app/features/users/data/users_api.dart';
+import '../widgets/settings_page_scaffold.dart';
 
 class SettingsScreen extends StatefulWidget {
   const SettingsScreen({super.key});
@@ -65,36 +65,20 @@ class _SettingsScreenState extends State<SettingsScreen> {
 
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
-      backgroundColor: AppColors.surfaceSecondary,
-      body: SafeArea(
-        child: Column(
-          children: [
-            const widgets.PageHeader(leading: widgets.BackButton()),
-            Expanded(
-              child: SingleChildScrollView(
-                padding: const EdgeInsets.fromLTRB(
-                  AppSpacing.xl,
-                  AppSpacing.sm,
-                  AppSpacing.xl,
-                  AppSpacing.xl,
-                ),
-                child: Column(
-                  crossAxisAlignment: CrossAxisAlignment.start,
-                  children: [
-                    _buildProfileHero(),
-                    const SizedBox(height: 16),
-                    _buildQuickActions(context),
-                    const SizedBox(height: 16),
-                    _buildSubscriptionCard(),
-                    const SizedBox(height: 16),
-                    _buildMenuCard(context),
-                  ],
-                ),
-              ),
-            ),
-          ],
-        ),
+    return SettingsPageScaffold(
+      title: '设置',
+      onBack: () => context.pop(),
+      body: Column(
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        children: [
+          _buildProfileHero(),
+          const SizedBox(height: 16),
+          _buildQuickActions(context),
+          const SizedBox(height: 16),
+          _buildSubscriptionCard(),
+          const SizedBox(height: 16),
+          _buildMenuCard(context),
+        ],
       ),
     );
   }
@@ -253,7 +237,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
           child: _buildActionCard(
             icon: Icons.auto_awesome,
             iconColor: const Color(0xFF8B5CF6),
-            title: '常用功能',
+            title: '周期计划',
             subtitle: '已启用：会议提醒',
             onTap: () => context.push('/settings/features'),
           ),
@@ -459,7 +443,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
             icon: Icons.system_update,
             title: '检查更新',
             trailing: 'v${AppConstants.version}',
-            onTap: () => _checkForUpdates(context),
+            onTap: _checkForUpdates,
           ),
         ],
       ),
@@ -528,7 +512,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
     );
   }
 
-  Future<void> _checkForUpdates(BuildContext context) async {
+  Future<void> _checkForUpdates() async {
     try {
       final settingsApi = sl<SettingsApi>();
       final result = await settingsApi.checkUpdates(