feat(UI): 改进提示框功能并添加Boss提醒

- 将TipBox的Label改为RichTextLabel以支持富文本
- 添加主题文件支持多种字体样式
- 修改showTip方法支持自定义显示时长
- 添加Boss波次提醒功能
- 调整TipBox场景的布局和样式

scripts/Statemachine/TipBox.gd

@@ -4,7 +4,7 @@ class_name TipBox
 
 @export var text: String = "nothing"
 
-@onready var label: Label = $%label
+@onready var label: RichTextLabel = $%label
 @onready var animator: AnimationPlayer = $%animator
 
 func _ready():

scripts/Statemachine/UIState.gd

@@ -74,11 +74,11 @@ static func setPanel(targetName: String = "", args: Array = []):
 				panel.hidePanel()
 static func closeCurrentPanel():
 	setPanel()
-static func showTip(text: String, destroyAfter: bool = false):
+static func showTip(text: String, destroyAfter: float = -1):
 	var box = TipBox.create(text)
 	tips.add_child(box)
-	if destroyAfter:
-		await TickTool.millseconds(len(text) * 500)
+	if destroyAfter > 0:
+		await TickTool.millseconds(destroyAfter * len(text))
 		box.destroy()
 	else:
 		return box