gemwalletcom/wallet ? reverse-engineered prompt

Build me a polished open source crypto wallet app for iPhone and Android that lets people safely manage their own funds. It should support multiple chains, with a clean mobile first experience, account setup, sending and receiving, viewing balances and activity, swaps, staking, WalletConnect, fiat on and off ramp, alerts, and market data.

I want the iOS and Android apps to feel native, but share the important wallet logic in Rust so the same core behavior works on both platforms. Make the design simple and trustworthy, with strong security around keys and signing since this is a self custodial wallet. Include the usual screens a real wallet needs, plus sensible empty states, loading states, and error handling.

If you need to check current docs or best practices while building it, look them up online.