fix(player): 修复进度条拖动树稳定性

test/player/seek_scrub_visibility_test.dart

@@ -2,6 +2,9 @@
 
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:fruitshorts/core/data/models/drama.dart';
+import 'package:fruitshorts/l10n/app_localizations.dart';
+import 'package:fruitshorts/pages/player/widgets/home_feed_overlay.dart';
 import 'package:fruitshorts/pages/player/widgets/seek_progress_bar.dart';
 import 'package:video_player/video_player.dart';
 
@@ -68,6 +71,86 @@ void main() {
       6,
     );
   });
+
+  testWidgets('feed progress tap does not clear overlay content', (
+    tester,
+  ) async {
+    await _pumpFeedOverlay(tester);
+
+    await tester.tap(find.byKey(const Key('home-feed-progress')));
+    await tester.pumpAndSettle();
+
+    expect(tester.takeException(), isNull);
+    expect(find.byKey(const Key('home-feed-progress')), findsOneWidget);
+    expect(
+      tester
+          .widget<AnimatedOpacity>(
+            find.byKey(const Key('home-feed-content-opacity')),
+          )
+          .opacity,
+      1,
+    );
+  });
+
+  testWidgets('feed progress drag then immediate release restores content', (
+    tester,
+  ) async {
+    await _pumpFeedOverlay(tester);
+    final gesture = await tester.startGesture(
+      tester.getCenter(find.byKey(const Key('home-feed-progress'))),
+    );
+
+    await gesture.moveBy(const Offset(80, 0));
+    await tester.pump();
+    await gesture.up();
+    await tester.pumpAndSettle();
+
+    expect(tester.takeException(), isNull);
+    expect(find.byKey(const Key('home-feed-progress')), findsOneWidget);
+    expect(
+      tester
+          .widget<AnimatedOpacity>(
+            find.byKey(const Key('home-feed-content-opacity')),
+          )
+          .opacity,
+      1,
+    );
+    expect(
+      tester.getSize(find.byKey(const Key('home-feed-progress-track'))).height,
+      2,
+    );
+  });
+
+  testWidgets('feed progress remains mounted and thick while dragging', (
+    tester,
+  ) async {
+    await _pumpFeedOverlay(tester);
+    final progress = find.byKey(const Key('home-feed-progress'));
+    final gesture = await tester.startGesture(tester.getCenter(progress));
+
+    await gesture.moveBy(const Offset(80, 0));
+    await tester.pump();
+    await tester.pump(const Duration(milliseconds: 130));
+
+    expect(tester.takeException(), isNull);
+    expect(progress, findsOneWidget);
+    expect(find.byKey(const Key('scrub-preview-time-bubble')), findsOneWidget);
+    expect(
+      tester
+          .widget<AnimatedOpacity>(
+            find.byKey(const Key('home-feed-content-opacity')),
+          )
+          .opacity,
+      0,
+    );
+    expect(
+      tester.getSize(find.byKey(const Key('home-feed-progress-track'))).height,
+      6,
+    );
+
+    await gesture.up();
+    await tester.pumpAndSettle();
+  });
 }
 
 Future<_HarnessState> _pumpHarness(WidgetTester tester) async {
@@ -104,6 +187,64 @@ SliderThemeData _sliderTheme(WidgetTester tester) {
       .data;
 }
 
+Future<ValueNotifier<VideoPlayerValue>> _pumpFeedOverlay(
+  WidgetTester tester,
+) async {
+  final controller = ValueNotifier<VideoPlayerValue>(
+    const VideoPlayerValue(
+      duration: Duration(minutes: 2),
+      position: Duration(seconds: 20),
+      isInitialized: true,
+    ),
+  );
+  addTearDown(controller.dispose);
+  await tester.pumpWidget(
+    MaterialApp(
+      locale: const Locale('en'),
+      supportedLocales: AppLocalizations.supportedLocales,
+      localizationsDelegates: AppLocalizations.localizationsDelegates,
+      home: Builder(
+        builder: (context) => Scaffold(
+          body: HomeFeedOverlay(
+            l10n: AppLocalizations.of(context)!,
+            drama: const Drama(
+              id: 'scrub-drama',
+              title: 'Scrub Drama',
+              synopsis: 'A short synopsis.',
+              posterUrl: '',
+              totalEpisodes: 8,
+            ),
+            episode: const Episode(
+              id: 'scrub-episode',
+              number: 1,
+              title: 'Scrub Episode',
+              isFree: true,
+            ),
+            controller: controller,
+            locked: false,
+            liked: false,
+            saved: false,
+            visible: true,
+            boosting: false,
+            onLike: () {},
+            onSave: () {},
+            onComments: () {},
+            onShare: () {},
+            onDetail: () {},
+            onOpenFullPlayer: () {},
+            onTogglePlay: () {},
+            onBoostStart: () {},
+            onBoostEnd: () {},
+            onMore: () {},
+          ),
+        ),
+      ),
+    ),
+  );
+  await tester.pumpAndSettle();
+  return controller;
+}
+
 class _Harness extends StatefulWidget {
   const _Harness({super.key, required this.controller});