PATCH: views/layouts/admin.php

Replace this line:
        <a href="<?= url('/admin/settings') ?>" class="text-sm text-gray-600 hover:text-gray-900">Impostazioni</a>

With these lines:
        <a href="<?= url('/admin/settings') ?>" class="text-sm text-gray-600 hover:text-gray-900">Impostazioni</a>
        <a href="<?= url('/admin/notifications') ?>" class="text-sm text-gray-600 hover:text-gray-900">🔔 Notifiche</a>
        <a href="<?= url('/admin/gcal') ?>" class="text-sm text-gray-600 hover:text-gray-900">📅 Google Cal</a>