fix: destructure useLogout correctly in UserMenu

useLogout() returns { logout } but was assigned directly, causing
"r is not a function" when clicking sign out.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/client/components/UserMenu.tsx

@@ -6,7 +6,7 @@ import { LucideIcon } from "../lib/iconData";
 export function UserMenu() {
 	const [open, setOpen] = useState(false);
 	const menuRef = useRef<HTMLDivElement>(null);
-	const logout = useLogout();
+	const { logout } = useLogout();
 
 	useEffect(() => {
 		if (!open) return;