fix(player): 使用根Overlay渲染飘心

lib/pages/player/widgets/player_tap_gesture_region.dart

@@ -170,9 +170,7 @@ class _PlayerTapGestureRegionState extends State<PlayerTapGestureRegion> {
     final id = _nextHeartBurstId++;
     late final OverlayEntry entry;
     entry = OverlayEntry(
-      builder: (context) => Positioned(
-        left: origin.dx,
-        top: origin.dy,
+      builder: (context) => Positioned.fill(
         child: IgnorePointer(
           child: PlayerDoubleTapHeartBurst(
             key: ValueKey('heart-overlay-$id'),