I kindly request the addition of a sub-menu when the slider navbar is closed. <img width="290" alt="open" src="https://github.com/user-attachments/assets/1d1b41a0-4c81-43d8-bffa-e03f7f9276a8"> <img width="234" alt="closed" src="https://github.com/user-attachments/assets/b9800c3a-ac76-46fb-9c7f-2c98d1e590d6">
