tamannadhiman654-coder/mern-e2ee-chat-app ? reverse-engineered prompt

Build me a full chat app where people can sign up, log in, and then send messages securely with end to end encryption. I want a clean chat screen where users can see their conversation history, send encrypted text, and share files like images or PDFs, with everything stored safely in the database. Please also include public key handling so users can exchange keys properly, and make sure the app can fetch old messages and file links when someone opens a chat again.

I also want real time messaging with socket support, plus video and audio calling using WebRTC so two people can talk directly from the app. Keep the interface simple and modern, with separate screens for authentication, chatting, and calling. If you need to check current docs for anything, go ahead and look them up online.