chore(player): 移除飘心毫秒调试文字

lib/pages/player/widgets/player_double_tap_hearts.dart

@@ -159,18 +159,6 @@ class _PlayerDoubleTapHeartBurstState extends State<PlayerDoubleTapHeartBurst> {
         children: [
           for (var index = 0; index < _hearts.length; index++)
             _heart(_hearts[index], _elapsedMs.toDouble(), index),
-          if (kDebugMode)
-            Positioned(
-              left: widget.origin.dx + 8,
-              top: widget.origin.dy + 10,
-              child: IgnorePointer(
-                child: Text(
-                  '${_elapsedMs}ms',
-                  key: const Key('heart-burst-elapsed-debug'),
-                  style: const TextStyle(color: Colors.white60, fontSize: 11),
-                ),
-              ),
-            ),
         ],
       ),
     );