change user_name still used as login and add display_name for dashboard view instead of username on login

components/AccountAdminShell.tsx

@@ -28,7 +28,7 @@ const AccountAdminShell: React.FC = () => {
         </nav>
         <div className="border-t border-gray-200 p-4 space-y-2">
           <p className="text-xs text-gray-500 truncate">
-            {user?.user_name} · {roleLabel}
+            {user?.display_name} · {roleLabel}
           </p>
           <button
             type="button"