docs(card): add CSS custom properties documentation

[bennypowers]

Closes #2494

Added @cssprop documentation for 5 CSS custom properties to improve developer understanding of card header styling and typography customization.

⚠️ LLM-Assisted: Reviewers should verify the semantic meaning and design system accuracy.

[changeset-bot]

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Latest commit: 5f8a38a

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[github-actions]

Size Change: +289 B (+0.11%)

Total Size: 257 kB

Filename	Size	Change
./elements/rh-card/rh-card.js	3.41 kB	+289 B (+9.26%)	🔍

ℹ️ View Unchanged

Filename	Size
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