SAKETHHARKANCHI/beatbox-music-player ? reverse-engineered prompt

Build me a responsive Flutter web music player called BeatBox that feels polished and easy to use on desktop and mobile browser.

I want a splash screen, a simple login and register flow with demo access, then a home page with a featured carousel, genre chips, and a grid of songs that adapts to screen size. Add search with genre filtering and sorting, plus a library area for playlists and liked songs. The player should have the usual controls, play and pause, next and previous, seek bar, shuffle, repeat, volume control, queue, and a mini player so it keeps playing while I browse. Also include dark and light theme support and a basic profile editing screen.

Use the sample music already mentioned, keep the design clean and modern, and make sure it runs well as a Flutter web app. If you need to check anything current, look up the latest docs online.