fix(Characters/Chick): 调整小鸡AI攻击距离阈值

将小鸡AI的攻击距离阈值从300调整为200，以优化战斗行为

scripts/Contents/Characters/Chick.gd

@@ -18,7 +18,7 @@ func spawn():
 
 func ai():
 	move(currentFocusedBoss.position - position)
-	if currentFocusedBoss.position.distance_to(position) < 300:
+	if currentFocusedBoss.position.distance_to(position) < 200:
 		tryAttack(2)
 	elif currentFocusedBoss.position.distance_to(position) < 700:
 		tryAttack(1)