fix(player): 放慢随机飘心并验证完整时长

test/player/player_double_tap_hearts_test.dart

@@ -21,7 +21,7 @@ void main() {
         ),
       ),
     );
-    await tester.pump(const Duration(milliseconds: 400));
+    await tester.pump(const Duration(milliseconds: 600));
 
     final hearts = find.byIcon(Icons.favorite_rounded);
     final count = hearts.evaluate().length;
@@ -53,6 +53,35 @@ void main() {
     expect(PlayerDoubleTapHeartBurst.minParticleCount, 4);
     expect(PlayerDoubleTapHeartBurst.maxParticleCount, 5);
   });
+
+  testWidgets('heart burst completes after at least two simulated seconds', (
+    tester,
+  ) async {
+    var completed = false;
+    var elapsedMs = 0;
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Scaffold(
+          body: PlayerDoubleTapHeartBurst(
+            burstId: 2,
+            random: Random(7),
+            onCompleted: () => completed = true,
+          ),
+        ),
+      ),
+    );
+
+    while (!completed && elapsedMs < 4000) {
+      await tester.pump(const Duration(milliseconds: 16));
+      elapsedMs += 16;
+    }
+
+    expect(completed, isTrue);
+    expect(elapsedMs, greaterThanOrEqualTo(2000));
+    expect(elapsedMs, lessThanOrEqualTo(2600));
+    final count = find.byIcon(Icons.favorite_rounded).evaluate().length;
+    expect(count, inInclusiveRange(4, 5));
+  });
 }
 
 double _size(WidgetTester tester, int index) {