Fix admin close button by deferring event listener attachment

- Admin panel HTML is created after JavaScript runs
- Used setTimeout to defer event binding until DOM is ready- Close button now properly attaches and functions

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

index.html

@@ -5903,7 +5903,8 @@
         document.getElementById('navTab').addEventListener('click', () => switchTab('navigate'));
         document.getElementById('adminTab').addEventListener('click', () => switchTab('admin'));
 
-        // Admin overlay close button
+        // Admin overlay close button - defer to ensure DOM element exists
+        setTimeout(() => {
             const adminCloseBtn = document.getElementById('adminCloseBtn');
             if (adminCloseBtn) {
                 adminCloseBtn.addEventListener('click', () => {
@@ -5917,6 +5918,7 @@
                     switchTab('edit');
                 });
             }
+        }, 0);
 
         // Password dialog
         document.getElementById('passwordSubmit').addEventListener('click', checkPassword);