refactor: replace sidebar user footer with topbar dropdown menu

public/assets/js/main.js

@@ -200,3 +200,31 @@ function toggleServerList(e) {
         sub.style.maxHeight = sub.scrollHeight + 'px';
     }
 }
+
+function toggleUserMenu(e) {
+    e.stopPropagation();
+    const menu = document.getElementById('userMenu');
+    if (!menu) return;
+    const isOpen = menu.classList.contains('open');
+    document.querySelectorAll('.dropdown-menu.open').forEach(function(m) {
+        if (m !== menu) m.classList.remove('open');
+    });
+    if (!isOpen) {
+        menu.classList.add('open');
+        setTimeout(function() {
+            document.addEventListener('click', closeUserMenu);
+        }, 0);
+    } else {
+        menu.classList.remove('open');
+    }
+}
+
+function closeUserMenu(e) {
+    const menu = document.getElementById('userMenu');
+    if (!menu) return;
+    const wrapper = menu.closest('.topbar-user-dropdown');
+    if (wrapper && !wrapper.contains(e.target)) {
+        menu.classList.remove('open');
+        document.removeEventListener('click', closeUserMenu);
+    }
+}