feat(flutter): 统一空列表占位组件

test/watch/watch_records_page_test.dart

@@ -12,6 +12,7 @@ import 'package:fruitshorts/core/data/repositories/watch_history_repository.dart
 import 'package:fruitshorts/core/data/services/auth_controller.dart';
 import 'package:fruitshorts/core/data/services/auth_session_store.dart';
 import 'package:fruitshorts/core/platform/haptics.dart';
+import 'package:fruitshorts/core/widgets/empty_state.dart';
 import 'package:fruitshorts/l10n/app_localizations.dart';
 import 'package:fruitshorts/pages/watch_records/watch_records_page.dart';
 import 'package:provider/provider.dart';
@@ -124,6 +125,7 @@ void main() {
       expect(history.clearCalls, 1);
       expect(haptics.mediumImpacts, 1);
       expect(find.text('No watch history yet.'), findsOneWidget);
+      expect(find.byType(EmptyState), findsOneWidget);
     },
   );