arunava16/currency-exchange-demo ? reverse-engineered prompt

Build me a simple currency exchange demo app in Kotlin.

I want a clean app that lets a user pick a source currency and a target currency, enter an amount, and instantly see the converted value. It should feel simple and modern, with a straightforward screen that works well on Android. If it makes sense, include a small list or picker of common currencies, a swap button, and basic error handling for empty or invalid input.

Use fake rates or a simple built in exchange table if live rates are too much, but structure it so real rates could be added later. Make the UI polished enough to demo, with sensible defaults and a nice layout. If you need to check current Android or Kotlin docs online, go ahead and do that. Please set up the project so it builds and runs cleanly.