shrutishende1105/SigmaGPT ? reverse-engineered prompt

Build me a clean AI chat app with sign up, login, and saved chat history so each user can come back to their past conversations.

I want the experience to feel like a modern chat app, with messages appearing in real time as the AI responds, a simple sidebar or history view for old chats, and a smooth interface that works nicely on desktop and mobile. Please set it up with a separate backend and frontend, and make the app ready for real users with basic authentication, protected chat pages, and a way to store and load conversation history.

Keep the design simple and polished, and make sure the whole flow feels fast and easy to use. If you need to look up current docs online for the best way to wire things together, go ahead.