A card with a url now wraps its image and body in one instead of linking the title (and image) separately, so the card is clickable anywhere and reachable by keyboard. No JavaScript: an may wrap flow content in HTML5 as long as it holds no other interactive elements, and the existing external-link post-processing still adds target="_blank" rel="noopener" to the single link (image post-processing is unaffected).
- buildCardsHTML (post) and homePostCardsHTML (build): emit one link around the whole card when it has a url
- CSS: .card > a becomes a flex column that fills the card; hover and :focus-visible feedback (border/name colour, focus outline on the list item so it survives the card's overflow: hidden) via :has(), consistent with the theme switcher; drop the now-dead .card__name a rule
- update the card tests, AGENTS.md, README.md and the cards showcase post; rebuild the showcase site