fix(flutter): 回前台复位残留画中画状态

test/player/player_logic_test.dart

@@ -187,6 +187,34 @@ void main() {
 
       expect(logic.pip, isFalse);
     });
+
+    test('should_clear_stale_pip_when_app_returns_to_foreground', () async {
+      final factory = _RecordingFactory();
+      final drama = _drama('signal');
+      final logic = _logic(FakeWatchHistory());
+      final immersive = <bool>[];
+      logic.attach(
+        PlayerPage(drama: drama, initialIndex: 0),
+        isMounted: () => true,
+      );
+      logic.onImmersiveChanged = immersive.add;
+      logic.start(factory: factory.create, coordinator: PlaybackCoordinator());
+      await _drain(logic);
+
+      // 模拟画中画已进入但退出时没有回调 false。
+      logic.onPipChanged(true);
+      expect(logic.chromeHidden, isTrue);
+
+      logic.onLifecycle(AppLifecycleState.resumed);
+
+      expect(logic.pip, isFalse);
+      expect(logic.pipPreparing, isFalse);
+      expect(logic.chromeHidden, isFalse);
+      expect(immersive.last, isFalse);
+
+      logic.dispose();
+      await _drain(logic);
+    });
   });
 
   group('history writes', () {