fix(flutter): 修复导航白线与观看记录错误透传

test/watch/watch_records_controller_test.dart

@@ -8,6 +8,7 @@ import 'package:fruitshorts/core/data/models/home_feed.dart';
 import 'package:fruitshorts/core/data/models/watch_progress.dart';
 import 'package:fruitshorts/core/data/repositories/catalog_repository.dart';
 import 'package:fruitshorts/core/data/repositories/watch_history_repository.dart';
+import 'package:fruitshorts/core/data/remote/api_client.dart';
 import 'package:fruitshorts/core/data/services/watch_records_controller.dart';
 
 WatchProgress _progress(
@@ -153,6 +154,19 @@ void main() {
     expect(controller.error, 'progressError');
     expect(controller.records, isEmpty);
   });
+
+  test('should_preserve_backend_message_when_recent_request_fails', () async {
+    final history = ControlledWatchHistory([])
+      ..recentError = const ApiException(100000, '账号不存在，请先注册');
+    final controller = WatchRecordsController(
+      history: history,
+      catalog: ScriptedWatchCatalog(),
+    );
+
+    await controller.load();
+
+    expect(controller.error, '账号不存在，请先注册');
+  });
 }
 
 class ControlledWatchHistory implements WatchHistoryRepository {
@@ -160,6 +174,7 @@ class ControlledWatchHistory implements WatchHistoryRepository {
 
   final List<WatchProgress> items;
   bool failRecent = false;
+  Object? recentError;
   bool failRemove = false;
   bool failClear = false;
   Completer<void>? removeGate;
@@ -178,6 +193,7 @@ class ControlledWatchHistory implements WatchHistoryRepository {
 
   @override
   Future<List<WatchProgress>> recent({int limit = 20}) async {
+    if (recentError != null) throw recentError!;
     if (failRecent) throw StateError('recent unavailable');
     return items.take(limit).toList();
   }

test/watch/watch_records_page_test.dart

@@ -126,6 +126,23 @@ void main() {
       expect(find.text('No watch history yet.'), findsOneWidget);
     },
   );
+
+  testWidgets('should_show_backend_message_when_recent_request_fails', (
+    tester,
+  ) async {
+    final auth = await _auth(signedIn: true);
+    final history = _FailingRecentHistory();
+
+    await _pumpPage(
+      tester,
+      auth: auth,
+      history: history,
+      catalog: FakeCatalogRepository(),
+    );
+
+    expect(find.text('账号不存在，请先注册'), findsOneWidget);
+    expect(find.byKey(const Key('watch-records-retry')), findsOneWidget);
+  });
 }
 
 WatchProgress _progress(String dramaId) => WatchProgress(
@@ -202,6 +219,13 @@ class CountingWatchHistory extends InMemoryWatchHistoryRepository {
   }
 }
 
+class _FailingRecentHistory extends InMemoryWatchHistoryRepository {
+  @override
+  Future<List<WatchProgress>> recent({int limit = 20}) async {
+    throw const ApiException(100000, '账号不存在，请先注册');
+  }
+}
+
 class _FailingWatchCatalog implements CatalogRepository {
   final _delegate = FakeCatalogRepository();