fix: Replace window.onload with addEventListener for better event handling and hide spinner in skeleton functions

front/workflowsCore.php

@@ -1378,6 +1378,7 @@ $(document).ready(function () {
 });
 
 function hideWorkflowsSkeleton() {
+  hideSpinner();
   $('#workflows-skeleton').fadeOut(250, function() { $(this).remove(); });
 }