Navigation trail showing the user’s location in a hierarchy. and-breadcrumb
renders a <nav aria-label> wrapping an <ol>; group and-breadcrumb-item
children inside it and mark the last one current.
Note: `packages/web-components/src/components/and-breadcrumb/readme.md`
currently documents `and-breadcrumb-item`, not the `and-breadcrumb` root —
see the note on the [Accordion](/components/accordion/) page for why. The
root's table above comes from `and-breadcrumb.tsx` directly.