Implement the Avatar component from the Probo Radix UI Figma on top
of Base UI's avatar primitive (image load + fallback). It supports
size 1-9, solid/soft variants across the sand/gold/red/green/amber/
sky scales with highContrast, a radius scale, and a fallback node
for initials or an icon, plus a paired AvatarSkeleton. Styling uses
tailwind-variants/lite slots (root/image/fallback).
Add @base-ui/react to @probo/ui — the first v2 component built on a
Base UI primitive.
Signed-off-by: Émile Ré <emile@probo.com>
2063cfc2ff