Full-screen circular countdown + a Web-Audio beep — the satisfying timer widget, zero dependencies. Identified & scoped — packaging next.
The rest timer from a real workout app, extracted clean. Canvas arc, Web-Audio chime, no libraries.
24 interactive classes on shipping real tools with Claude Code and a terminal — the same process that built this shelf, not a drag-and-drop toy track.
Every class ends with a working artifact you keep. The proof it works? You're looking at it — this whole shelf was built that way.
See the 24 classes