ni5arga/protestchat ? reverse-engineered prompt

Build me an off grid encrypted chat app for iPhone and Android that keeps working with no internet, no cell service, and no server.

Phones should discover nearby phones over Bluetooth and pass messages along like a mesh, so a message can hop through other devices until it reaches the right person. I want four chat modes, public nearby messages, passphrase based channels, private groups, and direct one to one chats. Messages should be end to end encrypted, deduplicated, expire after a while, and be stored locally so the app can relay old unseen messages too.

Make it feel like a real messaging app with a simple home screen, chat screen, join channel screen, new group screen, verify screen, and settings. Keep the app fully usable in a protest or shutdown scenario, so no account, no login, no cloud, and no hidden reliance on internet services.

If you need anything unclear, look up the current docs online and make the native Bluetooth setup work properly on both platforms.