- Options API component with segments/{id?,label}, rootLabel, showRoot props
- Emits navigate(segment.id) for intermediate clicks, navigate(null) for root
- Computed visibleSegments collapses >4 segments to first+ellipsis+last two
- Segments without id render as plain non-clickable spans (admin static segments)
- Uses AppIcon for chevronRight separator (no inline SVG)
- All 10 Vitest tests pass
- Also creates AppIcon.vue (Rule 3: BreadcrumbBar imports it)
