fix: import getFileIcon from utils.js + close button re-bind after setBody

- vaulthome.js: getFileIcon was imported from viewer.js but lives in utils.js
- backups.js: setBody() now re-binds close button handler after innerHTML replacement

frontend/js/backups.js

@@ -112,7 +112,16 @@ function createOverlay() {
 
 function setBody(html) {
   const panel = document.getElementById('backup-viewer-panel');
-  if (panel) panel.innerHTML = html;
+  if (!panel) return;
+  panel.innerHTML = html;
+  // Re-bind close button after innerHTML replacement
+  const closeBtn = panel.querySelector('.backup-close-btn');
+  if (closeBtn) {
+    closeBtn.addEventListener('click', (e) => {
+      e.stopPropagation();
+      close();
+    });
+  }
 }
 
 function close() {

frontend/js/vaulthome.js

@@ -15,7 +15,8 @@
  */
 
 import { api } from './auth.js';
-import { el, safeCreateIcons, getFileIcon } from './viewer.js';
+import { el, safeCreateIcons } from './viewer.js';
+import { getFileIcon } from './utils.js';
 import { TabManager } from './ui.js';
 
 // ---------------------------------------------------------------------------