Fix 4: useHashTab navigate() uses history.replaceState instead of
window.location.hash assignment — no spurious history entries, no
anchor-jump scroll side-effect.
Fix 5: Tabs ArrowLeft/ArrowRight keyboard nav (WAI-ARIA tabs pattern).
Fix 6: TabId union type in EngagementDetailPage, cast from string for
type-safe switch on activeTab without breaking Tabs.onChange signature.
Fix 7: intentional comment on UsersAdminPage reset-password aerated row.
Tests: 236/236 (+2 arrow-key assertions in Tabs.test.tsx).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
4 new spec files adding 21 tests (7+6+4+4). Each component spec
includes brutalism invariant assertions (no rounded-md, no transition-*,
no shadow-*).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
