yogeshsshekhawat/Appzeto-project ? reverse-engineered prompt

Build me a polished e commerce app where customers can sign up, log in, browse products, search and filter the catalog, add items to a cart, save delivery addresses, and place orders with a smooth checkout flow. I want stock to update safely even if multiple people buy at once, with a live countdown or hold timer on pending orders so users can see how long their items are reserved. Please include a simple payment simulator for testing, plus support for real Razorpay style payment and webhook handling if needed.

Also build an admin area where I can add, edit, and remove products, manage variants like size and color, and update order status. Customers should be able to view their order history and order details, and cancel pending orders. Make it look clean and modern, and use the existing MERN setup with a React frontend and Node and Express backend connected to MongoDB. If you need to check current docs for anything, look them up online first.