fix(chat): 调整输入交互并加固 WS/告警处理

_Core/managers/SceneManager.gd

@@ -186,9 +186,9 @@ func set_next_spawn_name(spawn_name: String) -> void:
 # - 此方法会清除存储的名称，只能获取一次
 # - 如果未设置名称，返回空字符串
 func get_next_spawn_name() -> String:
-	var name = _next_spawn_name
+	var spawn_name: String = _next_spawn_name
 	_next_spawn_name = ""
-	return name
+	return spawn_name
 
 # ============ 场景注册方法 ============