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/chat/ui_schema_renderer_test.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:go_router/go_router.dart';
 import 'package:social_app/features/chat/ui/widgets/ui_schema_renderer.dart';
 
 void main() {
@@ -128,5 +129,93 @@ void main() {
 
       expect(find.textContaining('无效 UI Schema'), findsOneWidget);
     });
+
+    testWidgets('handles navigation action and jumps by path', (tester) async {
+      final schema = {
+        'version': '2.0',
+        'root': {
+          'type': 'stack',
+          'direction': 'vertical',
+          'appearance': 'plain',
+          'children': [
+            {
+              'type': 'button',
+              'label': '查看待办',
+              'style': 'primary',
+              'action': {
+                'type': 'navigation',
+                'path': '/todo/123',
+                'params': {'from': 'assistant'},
+              },
+            },
+          ],
+        },
+      };
+
+      final router = GoRouter(
+        initialLocation: '/',
+        routes: [
+          GoRoute(
+            path: '/',
+            builder: (context, state) =>
+                Scaffold(body: UiSchemaRenderer.renderSchema(schema)),
+          ),
+          GoRoute(
+            path: '/todo/:id',
+            builder: (context, state) => Text(
+              'todo detail ${state.pathParameters['id']} from ${state.uri.queryParameters['from']}',
+            ),
+          ),
+        ],
+      );
+
+      await tester.pumpWidget(MaterialApp.router(routerConfig: router));
+      await tester.tap(find.text('查看待办'));
+      await tester.pumpAndSettle();
+
+      expect(find.text('todo detail 123 from assistant'), findsOneWidget);
+    });
+
+    testWidgets('does not navigate for placeholder path', (tester) async {
+      final schema = {
+        'version': '2.0',
+        'root': {
+          'type': 'stack',
+          'direction': 'vertical',
+          'appearance': 'plain',
+          'children': [
+            {
+              'type': 'button',
+              'label': '坏路径',
+              'style': 'primary',
+              'action': {'type': 'navigation', 'path': '/todo/:id'},
+            },
+          ],
+        },
+      };
+
+      final router = GoRouter(
+        initialLocation: '/',
+        routes: [
+          GoRoute(
+            path: '/',
+            builder: (context, state) =>
+                Scaffold(body: UiSchemaRenderer.renderSchema(schema)),
+          ),
+          GoRoute(
+            path: '/todo/:id',
+            builder: (context, state) => const Text('detail'),
+          ),
+        ],
+      );
+
+      await tester.pumpWidget(MaterialApp.router(routerConfig: router));
+      await tester.tap(find.text('坏路径'));
+      await tester.pumpAndSettle();
+      await tester.pump(const Duration(seconds: 3));
+
+      expect(find.text('坏路径'), findsOneWidget);
+      expect(find.text('detail'), findsNothing);
+    });
   });
 }