Implement the Heading primitive from the Probo Radix UI Figma: it
renders the semantic h1–h6 chosen by a numeric level prop (driving
the document outline) while size controls the visual scale
independently, defaulting to size 6 / bold weight per the design.
Add a paired HeadingSkeleton and a story.
Factor the shared size/weight/align/color variants and the color ×
highContrast compound variants out of the Text tv so Text and
Heading differ only in their defaults.
Signed-off-by: Émile Ré <emile@probo.com>
eb808d429f