fix(UI): 修复EntityStateBar中levelLabel的引用问题

将levelLabel的引用更新为levelLabels以匹配场景中的节点名称，并确保节点在场景树中的唯一性

components/UI/EntityStateBar.tscn

@@ -17,6 +17,7 @@ offset_right = 50.0
 offset_bottom = 5.0
 
 [node name="levelLabel" type="HBoxContainer" parent="health"]
+unique_name_in_owner = true
 layout_mode = 1
 anchors_preset = -1
 anchor_left = 0.5

scripts/Statemachine/EntityBase.gd

@@ -77,7 +77,7 @@ func _ready():
 	health = fields.get(FieldStore.Entity.MAX_HEALTH)
 	energy = fields.get(FieldStore.Entity.MAX_ENERGY) * 0.5
 	if isPlayer():
-		statebar.levelLabel.hide()
+		statebar.levelLabels.hide()
 		UIState.player = self
 		hurtbox.body_entered.connect(
 			func(body):

scripts/Statemachine/EntityStateBar.gd

@@ -5,3 +5,4 @@ class_name EntityStateBar
 
 @onready var healthBar: ColorBar = $"%health"
 @onready var levelLabel: Label = $"%level"
+@onready var levelLabels: HBoxContainer = $"%levelLabel"