yiekheng 4ddf5c094e feat(web): admin nav entry + role-aware AppShell
- Add an Admin nav item (key 'admin', href /settings/users) with
  visibleTo=['admin'] so signed-in users with role='user' don't see it.
- nav-config exposes navItemsForRole(role) helper that filters NAV_ITEMS
  by visibleTo.
- Root layout fetches getCurrentUser() and forwards role into AppShell.
  AppShell narrows the role gate to the rendered nav (sidebar + drawer);
  /login still short-circuits to the bare header. Unknown role falls
  back to 'user' visibility (defense-in-depth).
- Settings page renders an admin-only card linking to Users so admins
  have a discoverable in-app entry point too.

Tests:
- nav-config: navItemsForRole admin/user matrix + admin entry shape.
- app-shell: admin link visible for admin, hidden for user, hidden for
  null/unauthenticated, /login bare header strips nav entirely.
- actions/auth: cookie payload encodes role=user, unknown role rejected,
  AUTH_SECRET-unset path, whitespace-only username rejected, rate-limit
  key contains client IP, unknown-user path still hits DB+bcrypt.

440 tests now (was 423).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-10 18:30:58 +08:00
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