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/shared/widgets/app_toggle_switch.dart

@@ -0,0 +1,58 @@
+import 'package:flutter/material.dart';
+
+import '../../core/theme/design_tokens.dart';
+
+class AppToggleSwitch extends StatelessWidget {
+  const AppToggleSwitch({
+    super.key,
+    required this.value,
+    required this.onChanged,
+    this.activeBackgroundColor,
+    this.inactiveBackgroundColor,
+    this.activeBorderColor,
+    this.inactiveBorderColor,
+  });
+
+  final bool value;
+  final ValueChanged<bool> onChanged;
+  final Color? activeBackgroundColor;
+  final Color? inactiveBackgroundColor;
+  final Color? activeBorderColor;
+  final Color? inactiveBorderColor;
+
+  @override
+  Widget build(BuildContext context) {
+    return GestureDetector(
+      onTap: () => onChanged(!value),
+      child: Container(
+        width: AppSpacing.xxl + AppSpacing.xl,
+        height: AppSpacing.xl + AppSpacing.xs,
+        padding: const EdgeInsets.all(AppSpacing.xs / 2),
+        decoration: BoxDecoration(
+          color: value
+              ? (activeBackgroundColor ?? AppColors.blue100)
+              : (inactiveBackgroundColor ?? AppColors.surfaceTertiary),
+          borderRadius: BorderRadius.circular(AppRadius.full),
+          border: Border.all(
+            color: value
+                ? (activeBorderColor ?? AppColors.blue300)
+                : (inactiveBorderColor ?? AppColors.borderSecondary),
+          ),
+        ),
+        child: AnimatedAlign(
+          duration: const Duration(milliseconds: 150),
+          alignment: value ? Alignment.centerRight : Alignment.centerLeft,
+          child: Container(
+            width: AppSpacing.lg + AppSpacing.xs,
+            height: AppSpacing.lg + AppSpacing.xs,
+            decoration: BoxDecoration(
+              color: AppColors.white,
+              borderRadius: BorderRadius.circular(AppRadius.full),
+              border: Border.all(color: AppColors.borderSecondary),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}