Click-to-match quiz widget with shuffle + wrong-flash — reusable for flashcards, trivia, onboarding. Identified & scoped — packaging next.
A matching exercise from a language-learning app, extracted as a drop-in component. State machine included.
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