A playable keyboard, one to ten octaves wide: press a key and it strikes with a velocity taken from how far down the key you landed, drag across it and it glissandos — previous note off, entered note on. Notes go out through onNoteOn/onNoteOff and never through a param channel, and what is lit comes back in as a held map shaped like the module contract's activeNotes, so a key that was struck but declined draws as struck-and-silent rather than as nothing at all. Scale membership and a root tint as controlled props, opt-in QWERTY input through lib/computer-keyboard, keys that are real buttons with note-name labels, and a read-only mode for drawing a voicing.
pnpm dlx shadcn@latest add "https://pluginui.com/r/core-piano-keyboard.json"