tanaydeshmukh7/chat-whalla ? reverse-engineered prompt

Build me a modern WhatsApp style chat app where people can sign in with their phone number, verify with a simple OTP flow, then set up a profile with a name, about text, and avatar. I want one on one messaging that updates instantly, shows when someone is online, typing, and includes sent, delivered, and seen status for messages. It should also let users add contacts by phone number and start chatting right away.

Make the whole thing feel polished and dark, with a clean chat layout and emoji support. Use a real time backend and a React frontend so two different browsers can chat with each other live. For development, it’s fine to use a fake OTP like 123456 instead of a real SMS service. If you need to, look up current docs online for anything unclear, and make sure it runs smoothly with a local database and a simple setup flow.