fix(player): 使用根Overlay承载飘心

test/player/player_double_tap_hearts_test.dart

@@ -10,7 +10,9 @@ void main() {
   ) async {
     await tester.pumpWidget(
       const MaterialApp(
-        home: Scaffold(body: PlayerDoubleTapHeartBurst(onCompleted: _noop)),
+        home: Scaffold(
+          body: PlayerDoubleTapHeartBurst(burstId: 1, onCompleted: _noop),
+        ),
       ),
     );
     await tester.pump(const Duration(milliseconds: 200));
@@ -42,7 +44,9 @@ void main() {
   ) async {
     await tester.pumpWidget(
       const MaterialApp(
-        home: Scaffold(body: PlayerDoubleTapHeartBurst(onCompleted: _noop)),
+        home: Scaffold(
+          body: PlayerDoubleTapHeartBurst(burstId: 2, onCompleted: _noop),
+        ),
       ),
     );
 
@@ -61,7 +65,10 @@ void main() {
     await tester.pumpWidget(
       MaterialApp(
         home: Scaffold(
-          body: PlayerDoubleTapHeartBurst(onCompleted: () => completed = true),
+          body: PlayerDoubleTapHeartBurst(
+            burstId: 3,
+            onCompleted: () => completed = true,
+          ),
         ),
       ),
     );