feat(player): 未就绪改由进度条展示加载态

test/player/player_fullscreen_test.dart

@@ -18,7 +18,6 @@ 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/playback_session.dart';
 import 'package:fruitshorts/core/theme/app_colors.dart';
-import 'package:fruitshorts/core/widgets/remote_image.dart';
 import 'package:fruitshorts/pages/auth/auth_view.dart';
 import 'package:fruitshorts/pages/player/widgets/player_center_toggle.dart';
 import 'package:fruitshorts/pages/player/widgets/seek_progress_bar.dart';
@@ -132,15 +131,9 @@ void main() {
     expect(player.playing, isTrue);
   });
 
-  testWidgets('should_fall_back_to_black_when_poster_is_empty', (tester) async {
-    await _pumpApp(
-      tester,
-      catalog: FakeCatalogRepository(dramas: const [_noCoverDrama]),
-    );
-    await _openSeriesPlayer(
-      tester,
-      cardKey: const Key('home-drama-card-no-cover-demo'),
-    );
+  testWidgets('should_keep_video_surface_background_black', (tester) async {
+    await _pumpApp(tester);
+    await _openSeriesPlayer(tester);
 
     expect(
       tester
@@ -150,6 +143,8 @@ void main() {
           .color,
       Colors.black,
     );
+    expect(find.byKey(const Key('player-fallback-cover')), findsNothing);
+    expect(find.byKey(const Key('player-fallback-scrim')), findsNothing);
   });
 
   testWidgets('should_gate_comments_before_opening_sheet_when_signed_out', (
@@ -415,19 +410,9 @@ void main() {
     expect(find.byKey(const Key('player-background')), findsNothing);
     final fallback = find.byKey(const Key('player-fallback-background'));
     expect(fallback, findsOneWidget);
-    expect(find.byKey(const Key('player-fallback-cover')), findsOneWidget);
-    expect(
-      tester
-          .widget<RemoteImage>(find.byKey(const Key('player-fallback-cover')))
-          .fallbackColor,
-      Colors.black,
-    );
-    expect(
-      tester
-          .widget<ColoredBox>(find.byKey(const Key('player-fallback-scrim')))
-          .color,
-      const Color(0x4D000000),
-    );
+    expect(tester.widget<ColoredBox>(fallback).color, Colors.black);
+    expect(find.byKey(const Key('player-fallback-cover')), findsNothing);
+    expect(find.byKey(const Key('player-fallback-scrim')), findsNothing);
     expect(
       tester
           .widget<Scaffold>(find.byKey(const Key('player-scaffold')))
@@ -476,7 +461,8 @@ void main() {
       tester.getSize(find.byKey(const Key('player-bottom-clear-screen'))),
       const Size(40, 40),
     );
-    expect(tester.widget<Slider>(find.byType(Slider)).padding, EdgeInsets.zero);
+    expect(find.byKey(const Key('progress-loading')), findsOneWidget);
+    expect(find.byType(Slider), findsNothing);
 
     expect(bottom.height, lessThanOrEqualTo(200));
     expect(bottom.top, greaterThanOrEqualTo(screenHeight * 0.78));
@@ -1092,7 +1078,8 @@ void _expectFullscreenOverlay(WidgetTester tester) {
   expect(find.byKey(const Key('player-pip')), findsNothing);
   expect(find.byKey(const Key('player-rail-comments')), findsOneWidget);
   expect(find.byKey(const Key('player-fullscreen-toggle')), findsNothing);
-  expect(find.byType(Slider), findsOneWidget);
+  expect(find.byKey(const Key('progress-loading')), findsOneWidget);
+  expect(find.byType(Slider), findsNothing);
   expect(find.byKey(const Key('player-title')), findsNothing);
   expect(find.byKey(const Key('player-subtitle')), findsNothing);
   expect(find.byKey(const Key('player-genre-chip')), findsNothing);
@@ -1211,20 +1198,3 @@ const _lockedDrama = Drama(
     ),
   ],
 );
-
-const _noCoverDrama = Drama(
-  id: 'no-cover-demo',
-  title: 'No Cover Demo',
-  synopsis: 'No cover synopsis',
-  posterUrl: '',
-  detailLoaded: true,
-  episodes: [
-    Episode(
-      id: 'no-cover-demo-1',
-      number: 1,
-      title: 'No Cover Episode',
-      isFree: true,
-      videoUrl: 'https://example.test/no-cover-demo-1.mp4',
-    ),
-  ],
-);