saurav7747/Chatlord ? reverse-engineered prompt

Build me a private WhatsApp like chat app as a PWA, using the Supabase project I already have for login, database, storage, and realtime updates. I want a clean mobile first interface with dark mode by default, light mode too, a chat list, conversation view, contacts, profile and settings, plus basic status updates and group chats if the data is there.

It should let people sign in, see their conversations, send text and media, react to messages, and stay in sync in real time. Make it installable on phones, work offline for the app shell, and show a friendly install prompt. Keep private data out of cache, and only use the public Supabase key from environment variables. If anything in the table names or relationships is different in my Supabase setup, make the queries easy to adjust, and look up current docs online if you need to.

Please make it feel polished, fast, and simple, with plain CSS and no UI framework.