sknaimhossain759-ui/mern-ecommerce ? reverse-engineered prompt

Build me a simple MERN style e commerce app in this project folder. I want a clean storefront where people can browse products, view a product page, add items to a cart, and go through a basic checkout flow.

Make it feel polished and easy to use, with a homepage, product listing, search or filters if it fits naturally, and a cart that updates properly. If it makes sense, include basic account features like sign in, sign up, and order history, plus a simple admin area for adding and editing products.

Use the existing project structure if there is one, and if you need to check current docs or best practices online, go ahead. Please make it runnable, wired together, and styled enough that it looks like a real store rather than a bare demo.