feat: 添加日历批量操作与客户端时区感知功能，优化前端 UI 交互体验

apps/test/features/chat/ui_schema_renderer_test.dart

@@ -59,6 +59,64 @@ void main() {
       expect(find.text('评审会'), findsOneWidget);
     });
 
+    testWidgets('renders batch result list items in one card', (tester) async {
+      final schema = {
+        'version': '2.0',
+        'root': {
+          'type': 'stack',
+          'direction': 'vertical',
+          'appearance': 'card',
+          'status': 'warning',
+          'children': [
+            {'type': 'text', 'role': 'title', 'content': '日历操作完成'},
+            {
+              'type': 'stack',
+              'direction': 'vertical',
+              'gap': 8,
+              'children': [
+                {
+                  'type': 'stack',
+                  'direction': 'vertical',
+                  'appearance': 'card',
+                  'children': [
+                    {'type': 'text', 'role': 'body', 'content': '#1 create'},
+                    {'type': 'text', 'role': 'caption', 'content': '成功'},
+                    {'type': 'text', 'role': 'caption', 'content': '日程「晨会」已创建'},
+                  ],
+                },
+                {
+                  'type': 'stack',
+                  'direction': 'vertical',
+                  'appearance': 'card',
+                  'children': [
+                    {'type': 'text', 'role': 'body', 'content': '#2 delete'},
+                    {'type': 'text', 'role': 'caption', 'content': '失败'},
+                    {
+                      'type': 'text',
+                      'role': 'caption',
+                      'content': 'Schedule item not found',
+                    },
+                  ],
+                },
+              ],
+            },
+          ],
+        },
+      };
+
+      await tester.pumpWidget(
+        MaterialApp(
+          home: Scaffold(body: UiSchemaRenderer.renderSchema(schema)),
+        ),
+      );
+
+      expect(find.text('日历操作完成'), findsOneWidget);
+      expect(find.text('#1 create'), findsOneWidget);
+      expect(find.text('#2 delete'), findsOneWidget);
+      expect(find.text('成功'), findsOneWidget);
+      expect(find.text('失败'), findsOneWidget);
+    });
+
     testWidgets('renders fallback for invalid schema', (tester) async {
       await tester.pumpWidget(
         MaterialApp(