fix(LGBTBullet): 修复子弹追踪逻辑并添加丢失目标检测

添加lastDistance和missedTarget变量来检测子弹是否错过目标
当子弹与目标距离增大时标记为missedTarget停止追踪

scripts/Contents/Bullets/LGBTBullet.gd

@@ -4,14 +4,21 @@ class_name LGBTBullet
 var tracer: EntityBase = null
 var maxTraceTime: float = 0
 var tracePower: float = 0
+var lastDistance: float = INF
+var missedTarget: bool = false
 
 func register():
 	speed = 1
 func ai():
 	speed *= 1.05
 	speed = clamp(speed, 0, 20)
-	if is_instance_valid(tracer) and timeLived() < maxTraceTime:
+	if !missedTarget and is_instance_valid(tracer) and timeLived() < maxTraceTime:
 		PresetBulletAI.trace(self, tracer.getTrackingAnchor(), tracePower)
 	PresetBulletAI.forward(self, rotation)
+	var currentDistance = position.distance_to(tracer.getTrackingAnchor())
+	if currentDistance > lastDistance:
+		missedTarget = true
+	else:
+		lastDistance = currentDistance
 func destroy(_b):
 	EffectController.create(ComponentManager.getEffect("LGBTBoom"), position).shot()