Match the existing src/components/ui/breadcrumb.tsx pattern: separator
chevrons are aria-hidden so screen readers don't announce them, and
the terminal segment (Root or current folder name) carries
aria-current="page" so SR users know which crumb is the current page.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Renders the current folder's path as a clickable breadcrumb with a
Home affordance back to "All documents". Each ancestor is clickable
to navigate up; the last segment is the current folder (non-clickable,
foreground colour).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
