GeekyAnts/NativeBase ? reverse-engineered prompt

Build me a mobile first UI component library for React Native and web that feels consistent across Android, iOS, and browser. I want reusable components like buttons, forms, layout, typography, alerts, badges, avatars, dialogs, and other common building blocks, with good accessibility built in and support for light and dark mode.

Make it easy to theme the whole app, and let me use simple style props for spacing, colors, and responsive layouts without writing a lot of custom CSS. Include a clean set of example apps so I can see the components working in Expo, a bare React Native app, and on web. If you need to check current docs or best practices, look them up online and keep the implementation practical and polished.