Replaces the implicit, fluid status of the legacy admin monolith with a
6-card grid at the top of /admin per ui-guidelines.md §3.4. Each card
pairs a §2.6 colored dot with a text label so state never relies on
color alone (WCAG 1.4.1).
- New aggregator endpoint /api/admin/status-overview returns a single
batched Promise.all (no N+1) covering Users, Integrations, Monitoring,
Backups, Maintenance, Audit log — with severity precomputed server-side.
- New <StatusCardGrid> + reusable <StatusBadge> component in
src/components/admin/. Pure buildCards() function makes severity
mapping unit-testable.
- Tests: 14 new (8 aggregator severity/shape, 6 grid badge + a11y).
- Wires the grid above the existing admin sections; per-section
extraction will land in follow-ups.
Co-authored-by: Marc-André Bombeck <noreply@anthropic.com>
