A stateful submit button that runs its async lifecycle like a piston stroke: label and spinner slide along one axis while the width breathes, a check draws itself on success, and rejection plays a shake-and-retry beat. Pass an async onClick and it owns the state machine — aria-busy, live announcements, and real disabling included.
pnpm dlx shadcn@latest add "https://crucibleui.com/r/piston.json"