iahmad16/MERN-ECommerce-Full-Stack-Project ? reverse-engineered prompt

Build me a full stack e commerce site for a tech store called Cyber Tech, with a clean customer facing website and a separate admin dashboard.

On the main site, people should be able to browse products, open a product detail page, add items to cart, and log in and out. I want the cart and product data to stay saved, so if someone leaves or logs out and comes back, their cart is still there.

For the admin side, I want a simple panel where I can add products, see them in a list, and delete them. The products should fit into four categories, Phones, Tablets, Laptops, and Audio. When I add or remove something in the admin area, it should update the database and show the change on the storefront too.

Please make the backend handle product data, authentication, cart data, and the basic API needed for the app to work. Use a modern full stack setup, and if you need to check current docs or best practices online, go ahead.