fix: Sidekick 에디터 자동 실행 방지

- Sidekick Character Tool과 Downloader가 메뉴 실행 시에만 열리도록 수동 실행 플래그를 추가
- 데이터베이스 초기화 실패 및 로딩 상태 null 참조 방어 처리 추가
- TMP 한글 폰트 에셋의 글리프/문자 테이블 갱신

Assets/External/Models/SidekickCharacters/Scripts/Editor/UI/MenuBootstrapController.cs

@@ -12,38 +12,11 @@ using UnityEngine;
 
 namespace Synty.SidekickCharacters.UI
 {
-    [InitializeOnLoad]
     public static class MenuBootstrapController
     {
-        private const string _AUTO_OPEN_STATE = "syntySkAutoOpenState";
-        private const string _PREFS_CHECK_NAME = "syntySKCheckDependencies";
+        private const string _MANUAL_OPEN_SESSION_KEY = "syntySkManualOpenRequested";
 
         private static ModularCharacterWindow _sidekickCharacterWindow;
-        private static bool _openWindowOnStart = true;
-
-        static MenuBootstrapController()
-        {
-            EditorApplication.update += OpenWindowOnStartup;
-        }
-
-        /// <summary>
-        ///     Opens the Character Creator window when Unity starts or the plugin is added to a project.
-        /// </summary>
-        private static void OpenWindowOnStartup()
-        {
-            _openWindowOnStart = EditorPrefs.GetBool(_AUTO_OPEN_STATE, true);
-            EditorApplication.update -= OpenWindowOnStartup;
-            if (_openWindowOnStart)
-            {
-                if (!SessionState.GetBool("FirstInitDone", false))
-                {
-                    ShowSidekickCharacterWindow();
-          
-                    SessionState.SetBool("FirstInitDone", true);
-                }
-                
-            }
-        }
 
         /// <summary>
         ///     Creates the Sidekick Character Creator window and adds it to the toolbar.
@@ -51,6 +24,7 @@ namespace Synty.SidekickCharacters.UI
         [MenuItem("Synty/Sidekick Character Tool")]
         public static void ShowSidekickCharacterWindow()
         {
+            SessionState.SetBool(_MANUAL_OPEN_SESSION_KEY, true);
             FindSidekickCharacterWindow();
             _sidekickCharacterWindow.Show();
         }