Yes. Copy the source into your app and ship it. There is no attribution requirement and no runtime package to install.
Every color comes from shadcn tokens like bg-card, border-border and text-muted-foreground, so light, dark and custom themes just work.
Headers are real buttons inside headings with aria-expanded and aria-controls. Use Arrow Up/Down to move between them and Home/End to jump to the ends.
Yes. With prefers-reduced-motion enabled the panels open instantly instead of animating their height.