fixed request for reauth on clicking show folder

frontend/index.html

@@ -880,7 +880,6 @@
   const iframeViewerModal = document.getElementById('iframeViewerModal');
   const iframeViewer = document.getElementById('iframeViewer');
   const iframeLoader = document.getElementById('iframeLoader');
-  iframeLoader.style.display = 'none'; // disable loader overlay entirely
   const iframeTitle = document.getElementById('iframeTitle');
   const iframeBackBtn = document.getElementById('iframeBackBtn');
   const iframeCloseBtn = document.getElementById('iframeCloseBtn');
@@ -1354,12 +1353,14 @@
     iframeTitle.textContent = job.Job_Number ? `Job# ${job.Job_Number}` : 'Job Files';
     fileListContainer.classList.remove('hidden');
     iframeViewer.classList.add('hidden');
+    pdfViewer.classList.add('hidden');
 
     // Check if we have cached files
     const cached = fileCache.get(link);
     if (cached) {
       console.log('Using cached files for job', job.Job_Number);
       fileListState.items = cached.items;
+      iframeLoader.classList.add('hidden');
       renderFileGroups(link);
       return;
     }
@@ -1393,8 +1394,8 @@
         }
       }
 
-      // If still unauthorized or server missing token, prefer stale cache or open-in-new-tab without forcing reauth
-      if (resp.status === 401 || resp.status === 500) {
+      // If still unauthorized, prefer stale cache or open-in-new-tab without forcing reauth
+      if (resp.status === 401) {
         const cachedAgain = fileCache.get(link);
         if (cachedAgain) {
           fileListState.items = cachedAgain.items;