kakolihalder/filoder ? reverse-engineered prompt

Build me a simple Flutter app from scratch for phone, tablet, and web.

I want a clean starter app that opens to a polished home screen with a friendly welcome message, a few tappable cards or buttons, and a basic navigation flow to at least one extra page. Make it look modern and responsive so it works well across mobile, desktop, and web. Use a simple, nice visual style with sensible spacing, colors, and typography.

Please also set up the project so it runs smoothly on all the default Flutter platforms already included here. Add a couple of small example interactions, like showing a message, opening a detail screen, or switching a setting, so the app feels like a real starting point instead of an empty template.

Keep the code organized and easy to extend, and if you need anything from the latest Flutter docs, look it up online.