edwardwohaijun/file-transfer ? reverse-engineered prompt

Build me a simple file transfer web app where I can upload a few files, get a shareable link, and send that link to someone else so they can watch the upload progress and download the files. I want it to support a direct browser to browser transfer too, so if both people are online at the same time it can move the file without going through the server, ideally in Chrome. The shared page should expire automatically after a set amount of time and then delete the files.

Please make it feel lightweight and easy to run locally, with a Go backend and a React front end. I’d like basic limits like number of files, max file size, and expiration time to be configurable, and if it needs a database for tracking files and expiry, use MongoDB. Keep the UI simple and clean, with a clear upload area, progress display, and a page URL that I can copy and share right away. If you need to check current docs for anything, go ahead and look them up online.