fix(player): 隔离播放资源所有权并修复黑屏

test/player/player_fullscreen_test.dart

@@ -131,7 +131,7 @@ void main() {
     await tester.tap(find.byKey(const Key('home-feed-full-series')));
     await tester.pumpAndSettle();
 
-    final fullPlayer = find.byType(PlayerPage);
+    final fullPlayer = _fullPlayerFinder();
     final fullLogic = _pageLogic(tester, fullPlayer);
     expect(fullLogic.session, isNot(same(sourceLogic.session)));
     final fullPlayerPort = fullLogic.session.active! as VideoPlayerPort;
@@ -223,11 +223,17 @@ void main() {
     await tester.tap(find.byKey(const Key('home-feed-full-series')));
     await tester.pumpAndSettle();
 
-    expect(find.byType(PlayerPage), findsOneWidget);
+    expect(_fullPlayerFinder(), findsOneWidget);
     expect(find.byKey(const Key('player-play-toggle')), findsOneWidget);
-    expect(find.byKey(const Key('home-feed-center-play')), findsNothing);
-    expect(find.byKey(const Key('home-tabs-bar')), findsNothing);
-    expect(find.byKey(const Key('recommend-top-nav')), findsNothing);
+    expect(
+      find.byKey(const Key('home-feed-center-play')).hitTestable(),
+      findsNothing,
+    );
+    expect(find.byKey(const Key('home-tabs-bar')).hitTestable(), findsNothing);
+    expect(
+      find.byKey(const Key('recommend-top-nav')).hitTestable(),
+      findsNothing,
+    );
 
     await tester.tap(find.byKey(const Key('player-back')));
     await tester.pumpAndSettle();
@@ -259,7 +265,7 @@ void main() {
     await tester.tap(find.byKey(const Key('home-feed-full-series')));
     await tester.pumpAndSettle();
 
-    final fullLogic = _pageLogic(tester, find.byType(PlayerPage));
+    final fullLogic = _pageLogic(tester, _fullPlayerFinder());
     await tester.drag(
       find.byKey(const Key('player-video-tap')),
       const Offset(0, -560),
@@ -1646,6 +1652,12 @@ PlayerLogic _pageLogic(WidgetTester tester, Finder page) {
   return state.logic as PlayerLogic;
 }
 
+Finder _fullPlayerFinder() {
+  return find.byWidgetPredicate(
+    (widget) => widget is PlayerPage && widget.handoff != null,
+  );
+}
+
 class _RouteVideoFactory {
   final List<_RouteVideoPlayer> created = [];
   final List<Episode> episodes = [];