fix: 修复日历事件详情页布局问题并添加底部输入框

- 修复 Row 中 Flexible 在无界宽度约束下的布局崩溃问题
- 用 Expanded 包裹内层 Row 提供有界宽度约束
- 添加底部输入框组件（+按钮、输入框、麦克风图标）
- 实现事件详情页动态数据展示
- 添加编辑和删除事件功能
- 添加事件不存在时的错误页面

apps/lib/core/router/app_router.dart

@@ -62,6 +62,11 @@ GoRouter createAppRouter(AuthBloc authBloc) {
     },
     routes: [
       GoRoute(path: '/', builder: (context, state) => const LoginScreen()),
+      GoRoute(
+        path: '/calendar/events/:id',
+        builder: (context, state) =>
+            CalendarEventDetailScreen(eventId: state.pathParameters['id']!),
+      ),
       GoRoute(
         path: '/register',
         builder: (context, state) => const RegisterScreen(),
@@ -109,10 +114,6 @@ GoRouter createAppRouter(AuthBloc authBloc) {
           return CalendarMonthScreen(resetToToday: fromHome);
         },
       ),
-      GoRoute(
-        path: '/calendar/events/:id',
-        builder: (context, state) => const CalendarEventDetailScreen(),
-      ),
       GoRoute(
         path: '/todo',
         builder: (context, state) => const TodoQuadrantsScreen(),