fix(player): 放慢随机飘心并验证完整时长

lib/pages/player/widgets/player_double_tap_hearts.dart

@@ -18,6 +18,7 @@ class PlayerDoubleTapHeartBurst extends StatefulWidget {
 
   static const int minParticleCount = 4;
   static const int maxParticleCount = 5;
+  static const int minimumBurstDurationMs = 2000;
 
   final int burstId;
   final VoidCallback onCompleted;
@@ -60,11 +61,11 @@ class _PlayerDoubleTapHeartBurstState extends State<PlayerDoubleTapHeartBurst>
                 1,
           ),
       (index) {
-        if (index > 0) delay += 40 + random.nextInt(21);
+        if (index > 0) delay += 80 + random.nextInt(41);
         return _HeartParticle(
           delay: delay,
-          duration: 900 + random.nextInt(201),
-          travel: 120 + random.nextInt(41),
+          duration: 1500 + random.nextInt(301),
+          travel: 100 + random.nextInt(31),
           drift: -30 + random.nextInt(61),
           size: (22 + random.nextInt(13)).toDouble(),
           color: random.nextBool()
@@ -73,9 +74,22 @@ class _PlayerDoubleTapHeartBurstState extends State<PlayerDoubleTapHeartBurst>
         );
       },
     );
-    final total = _particles
+    var total = _particles
         .map((particle) => particle.delay + particle.duration)
         .reduce(max);
+    if (total < PlayerDoubleTapHeartBurst.minimumBurstDurationMs) {
+      final last = _particles.last;
+      final requiredDuration =
+          PlayerDoubleTapHeartBurst.minimumBurstDurationMs - last.delay;
+      final adjustedDuration = max(
+        last.duration,
+        requiredDuration,
+      ).clamp(1500, 1800).toInt();
+      _particles[_particles.length - 1] = last.withDuration(adjustedDuration);
+      total = _particles
+          .map((particle) => particle.delay + particle.duration)
+          .reduce(max);
+    }
     if (kDebugMode) {
       debugPrint('[player] phase=heart-burst-init id=${widget.burstId}');
       debugPrint(
@@ -97,7 +111,7 @@ class _PlayerDoubleTapHeartBurstState extends State<PlayerDoubleTapHeartBurst>
       final elapsedMs = _controller.duration?.inMilliseconds ?? 0;
       debugPrint(
         '[player] phase=heart-burst-complete '
-        'id=${widget.burstId} elapsedMs=$elapsedMs',
+        'id=${widget.burstId} configuredMs=$elapsedMs',
       );
     }
     widget.onCompleted();
@@ -106,9 +120,12 @@ class _PlayerDoubleTapHeartBurstState extends State<PlayerDoubleTapHeartBurst>
   @override
   void dispose() {
     if (kDebugMode) {
+      final elapsedMs = _completed
+          ? _controller.duration?.inMilliseconds ?? 0
+          : _lifetime.elapsedMilliseconds;
       debugPrint(
         '[player] phase=heart-burst-dispose '
-        'id=${widget.burstId} elapsedMs=${_lifetime.elapsedMilliseconds} '
+        'id=${widget.burstId} elapsedMs=$elapsedMs '
         'completed=${_completed ? 1 : 0}',
       );
     }
@@ -184,4 +201,15 @@ class _HeartParticle {
   final int drift;
   final double size;
   final Color color;
+
+  _HeartParticle withDuration(int nextDuration) {
+    return _HeartParticle(
+      delay: delay,
+      duration: nextDuration,
+      travel: travel,
+      drift: drift,
+      size: size,
+      color: color,
+    );
+  }
 }