fix: userfront 빌드 시 발생하는 Null Safety 에러 수정 #243

userfront/lib/core/services/web_auth_integration_web.dart

@@ -55,5 +55,5 @@ bool implIsPopup() {
 
   // Manual parse fallback for cases where Uri.base might miss params due to hash routing
   final search = html.window.location.search;
-  return search.contains('source=adminfront');
+  return search != null && search.contains('source=adminfront');
 }