fix(player): 使用根Overlay渲染飘心

test/player/double_tap_like_test.dart

@@ -143,6 +143,75 @@ void main() {
     expect(tester.state(burstFinder), same(burstState));
     expect(find.byKey(const Key('double-tap-heart-0')), findsOneWidget);
   });
+
+  testWidgets('heart overlay starts at global tap position and is cleaned up', (
+    tester,
+  ) async {
+    final key = GlobalKey<_HarnessState>();
+    final clock = _TestClock();
+    await _pumpHarness(
+      tester,
+      FakeInteractionRepository(),
+      FakeHaptics(),
+      key,
+      clock,
+    );
+    const tapPosition = Offset(120, 220);
+
+    await tester.tapAt(tapPosition);
+    clock.advance(const Duration(milliseconds: 100));
+    await tester.pump(const Duration(milliseconds: 100));
+    await tester.tapAt(tapPosition);
+    await tester.pump();
+    await tester.pump(const Duration(milliseconds: 1));
+
+    final firstHeart = find.byKey(const Key('double-tap-heart-0'));
+    expect(firstHeart, findsOneWidget);
+    expect(
+      (tester.getCenter(firstHeart) - tapPosition).distance,
+      lessThanOrEqualTo(1),
+    );
+
+    await tester.pumpWidget(const SizedBox.shrink());
+    await tester.pump();
+    expect(find.byType(PlayerDoubleTapHeartBurst), findsNothing);
+  });
+
+  testWidgets('multiple heart overlays run independently', (tester) async {
+    final key = GlobalKey<_HarnessState>();
+    final clock = _TestClock();
+    await _pumpHarness(
+      tester,
+      FakeInteractionRepository(),
+      FakeHaptics(),
+      key,
+      clock,
+    );
+
+    await tester.tapAt(const Offset(100, 180));
+    clock.advance(const Duration(milliseconds: 100));
+    await tester.pump(const Duration(milliseconds: 100));
+    await tester.tapAt(const Offset(100, 180));
+    await tester.pump();
+    await tester.pump(const Duration(milliseconds: 100));
+
+    clock.advance(const Duration(milliseconds: 400));
+    await tester.pump(const Duration(milliseconds: 400));
+    await tester.tapAt(const Offset(260, 360));
+    clock.advance(const Duration(milliseconds: 100));
+    await tester.pump(const Duration(milliseconds: 100));
+    await tester.tapAt(const Offset(260, 360));
+    await tester.pump();
+    await tester.pump(const Duration(milliseconds: 1));
+
+    expect(find.byType(PlayerDoubleTapHeartBurst), findsNWidgets(2));
+    expect(find.byKey(const ValueKey('heart-overlay-0')), findsOneWidget);
+    expect(find.byKey(const ValueKey('heart-overlay-1')), findsOneWidget);
+
+    await tester.pumpWidget(const SizedBox.shrink());
+    await tester.pump();
+    expect(find.byType(PlayerDoubleTapHeartBurst), findsNothing);
+  });
 }
 
 Future<void> _pumpHarness(