saksham3123/NexusChat ? reverse-engineered prompt

Build me a modern real time chat app where people can sign in, see other users, and message each other instantly.

I want a clean responsive chat interface with a conversation list, chat window, online and offline status, and live updates without refreshing. Users should be able to send text messages and share images or other media, and those uploads should show up nicely in the conversation. Include user profiles, basic user management, and a light and dark theme so the app feels polished.

Use a separate frontend and backend, save data in a database, and make sure messages and presence updates happen in real time. I also want secure login, so use a proper authentication service and keep private keys on the server. If you need to look up current docs online for the auth or upload parts, go ahead. Keep it modern, smooth, and simple to use.