callstack/react-native-paper ? reverse-engineered prompt

Build me a React Native UI kit that follows Material Design and works nicely on both iOS and Android.

I want a library of reusable, production ready components like buttons, cards, inputs, dialogs, and app bars, with solid theming support so the colors, typography, and styles can be customized easily. It should feel polished out of the box, but still be easy for app teams to drop into their own projects and make it match their brand.

Please also include a small example app that shows the components in action, plus a simple docs style setup so people can see how to use each piece. Keep the code clean, typed, and easy to extend, and make sure the components follow Material Design guidelines while still adapting well to each platform. If you need current implementation details, look up the latest docs online first.