hamsaraj875-del/NexTalk ? reverse-engineered prompt

Build me a simple full stack app called NexTalk, something like a modern chat and messaging app where people can sign up, log in, see other users, and send messages in a clean friendly interface.

I want it to feel polished and easy to use on desktop and mobile, with a nice chat layout, conversation list, message view, and basic profile or status info if it fits. Make sure the frontend and backend work together smoothly, with the usual things like authentication, storing messages, and handling errors cleanly.

If you need to look up current docs or best practices while building it, go ahead. Focus on making it feel like a real usable product, not just a demo.