schlagmichdoch/PairDrop ? reverse-engineered prompt

Build me a simple web app like PairDrop that lets people send files and text between devices without signing up or installing anything.

It should work in the browser, feel like AirDrop, and make nearby devices easy to spot on the same network. I also want a way to connect devices over the internet with a temporary room code, plus a longer lasting pairing option so my own devices can find each other again later. Support sending one file or several at once, and make multiple files download as a zip when needed.

Please make it friendly on phones and desktops, work as a PWA, and handle things like QR codes, display names, progress while transferring, and auto download when a transfer finishes. If you need to look up current browser or WebRTC details online, go ahead.