Migrating to 2.0.0

Component DOM now carries dr-* classes plus data-variant / data-size / state data-* attributes. Consumers using cn(buttonVariants({ variant, size }), extra) rewrite as either:

• <Button variant={...} size={...} className={extra} />, or
• on a non-button element: className={cn("dr-btn", extra)} plus data-variant={...} and data-size={...} attributes directly.

class-variance-authority is no longer a dependency of this package. Consumers that imported it transitively must depend on it directly.