andreszpyt/lexly ? reverse-engineered prompt

Build me a simple Flutter app called Lexly that feels polished and ready to grow.

I want a clean starter experience that works well on mobile, web, and desktop, with a nice home screen, basic navigation, and a few reusable UI components I can expand later. Make the design modern and friendly, with sensible empty states, responsive layouts, and smooth transitions where they make sense.

Please set it up so the app runs out of the box, is easy to understand, and follows good Flutter practices. If anything about the latest Flutter setup or best approach has changed, look up current docs online if you need to. Keep the code tidy and leave the app in a state where I can easily add real features next.