Simpler rounded styling

A consistent rounded prop for Avatar and Badge, plus clearer component documentation.

Improved

Expanded prop documentation and clarified component defaults and accessibility guidance. Corrected FloatingContent styling and marked Avatar as a client component.

Breaking changes

Avatar and Badge replace the shape prop with rounded. Use rounded for the rounded appearance and rounded={false} for the square appearance. Review existing shape props when upgrading.

<Avatar shape="rounded" {...props} />
<Avatar rounded {...props} />