fix(player): 修复详情往返播放位置丢失

test/drama_detail/drama_detail_first_frame_test.dart

@@ -14,6 +14,7 @@ import 'package:fruitshorts/core/data/repositories/playback_repository.dart';
 import 'package:fruitshorts/core/data/repositories/watch_history_repository.dart';
 import 'package:fruitshorts/core/data/services/catalog_controller.dart';
 import 'package:fruitshorts/core/data/services/favorite_controller.dart';
+import 'package:fruitshorts/core/data/services/playback_position_cache.dart';
 import 'package:fruitshorts/l10n/app_localizations.dart';
 import 'package:fruitshorts/pages/drama_detail/drama_detail_view.dart';
 
@@ -102,6 +103,7 @@ Future<void> _pumpDetail(
           value: InMemoryWatchHistoryRepository(),
         ),
         Provider<PlaybackRepository>.value(value: FakePlaybackRepository()),
+        Provider<PlaybackPositionCache>(create: (_) => PlaybackPositionCache()),
         ChangeNotifierProvider<FavoriteController>.value(value: favorites),
         ChangeNotifierProvider(
           create: (_) => CatalogController(catalog)..load(),

test/drama_detail/drama_detail_logic_test.dart

@@ -1,9 +1,11 @@
 import 'package:flutter_test/flutter_test.dart';
 import 'package:fruitshorts/core/data/models/drama.dart';
+import 'package:fruitshorts/core/data/models/watch_progress.dart';
 import 'package:fruitshorts/core/data/remote/api_client.dart';
 import 'package:fruitshorts/core/data/repositories/favorite_repository.dart';
 import 'package:fruitshorts/core/data/repositories/playback_repository.dart';
 import 'package:fruitshorts/core/data/services/favorite_controller.dart';
+import 'package:fruitshorts/core/data/services/playback_position_cache.dart';
 import 'package:fruitshorts/pages/drama_detail/drama_detail_logic.dart';
 
 import '../support/fake_watch_history.dart';
@@ -13,12 +15,14 @@ DramaDetailLogic _logic(
   Drama drama,
   FakeWatchHistory history, {
   FavoriteController? favorites,
+  PlaybackPositionCache? positionCache,
 }) =>
     DramaDetailLogic(
       drama: drama,
       history: history,
       playback: FakePlaybackRepository(),
       favorites: favorites ?? FavoriteController(InMemoryFavoriteRepository()),
+      positionCache: positionCache ?? PlaybackPositionCache(),
     );
 
 Drama _card(String id) => Drama(
@@ -103,6 +107,31 @@ void main() {
     logic.dispose();
   });
 
+  test('should_prefer_recent_local_position_when_loading_continue', () async {
+    final cache = PlaybackPositionCache();
+    cache.save(
+      episodeId: 'signal-3',
+      dramaId: 'signal',
+      position: const Duration(minutes: 1, seconds: 20),
+      duration: const Duration(minutes: 3),
+    );
+    final history = FakeWatchHistory()
+      ..records['signal'] = const WatchProgress(
+        dramaId: 'signal',
+        episodeId: 'signal-1',
+        position: Duration(seconds: 5),
+        duration: Duration(minutes: 3),
+      );
+    final logic = _logic(_detail('signal'), history, positionCache: cache);
+
+    await logic.load(() async => _detail('signal'));
+
+    expect(logic.continueIndex, 2);
+    expect(logic.progress?.position, const Duration(seconds: 80));
+    expect(history.reads, isEmpty);
+    logic.dispose();
+  });
+
   test('should_adjust_favorite_count_only_after_successful_changes', () async {
     final repository = InMemoryFavoriteRepository(cards: [_favoriteDrama]);
     final favorites = FavoriteController(repository);

test/drama_detail/drama_detail_view_test.dart

@@ -27,6 +27,7 @@ import 'package:fruitshorts/core/data/services/auth_session_store.dart';
 import 'package:fruitshorts/core/data/services/catalog_controller.dart';
 import 'package:fruitshorts/core/data/services/download_controller.dart';
 import 'package:fruitshorts/core/data/services/favorite_controller.dart';
+import 'package:fruitshorts/core/data/services/playback_position_cache.dart';
 import 'package:fruitshorts/core/data/services/interaction_controller.dart';
 import 'package:fruitshorts/core/data/services/playback_session.dart';
 import 'package:fruitshorts/core/data/services/wallet_controller.dart';
@@ -259,6 +260,25 @@ void main() {
     expect(player.initialIndex, 79);
   });
 
+  testWidgets('should_open_recent_cached_episode_when_detail_cta_is_tapped', (
+    tester,
+  ) async {
+    final cache = PlaybackPositionCache();
+    cache.save(
+      episodeId: 'detail-k38-3',
+      dramaId: 'detail-k38',
+      position: const Duration(minutes: 1, seconds: 20),
+      duration: const Duration(minutes: 3),
+    );
+    await _pumpDetail(tester, positionCache: cache);
+
+    await tester.tap(find.byKey(const Key('detail-cta')));
+    await tester.pumpAndSettle();
+
+    final player = tester.widget<PlayerPage>(find.byType(PlayerPage));
+    expect(player.initialIndex, 2);
+  });
+
   testWidgets('should_fit_compact_viewport_and_keep_cta_visible', (
     tester,
   ) async {
@@ -283,6 +303,7 @@ Future<void> _pumpDetail(
   WidgetTester tester, {
   Drama? drama,
   Size size = const Size(390, 844),
+  PlaybackPositionCache? positionCache,
 }) async {
   tester.view.physicalSize = size;
   tester.view.devicePixelRatio = 1;
@@ -303,6 +324,9 @@ Future<void> _pumpDetail(
           value: InMemoryWatchHistoryRepository(),
         ),
         Provider<PlaybackRepository>.value(value: FakePlaybackRepository()),
+        Provider<PlaybackPositionCache>.value(
+          value: positionCache ?? PlaybackPositionCache(),
+        ),
         Provider<PlayerFactory>.value(value: createWidgetPlayer),
         Provider(create: (_) => PlaybackCoordinator()),
         Provider<InteractionRepository>.value(value: interactions),