fix(ui): 主界面加载前黑屏遮罩，就绪后再淡出

Co-authored-by: Cursor <cursoragent@cursor.com>

Assets/Scripts/Framework/OtherKit/LocalizationKit.cs

@@ -1,4 +1,5 @@
-using AibisDream.Kit;
+using System.Collections;
+using AibisDream.Kit;
 using UnityEngine;
 using UnityEngine.Localization;
 using UnityEngine.Localization.Settings;
@@ -137,5 +138,23 @@ namespace AibisDream.Framework
         {
             await LocalizationSettings.InitializationOperation.Task;
         }
+
+        /// <summary>
+        /// 等待本地化系统初始化完成（含 SettingLoader 触发的语言切换）。
+        /// </summary>
+        public static IEnumerator WaitUntilReady()
+        {
+            yield return LocalizationSettings.InitializationOperation;
+            yield return null;
+        }
+
+        /// <summary>
+        /// 等待 LocalizeStringEvent 等 UI 组件刷新文案。
+        /// </summary>
+        public static IEnumerator WaitForUIRefresh()
+        {
+            yield return null;
+            Canvas.ForceUpdateCanvases();
+        }
     }
 }