Covers: default useAlerts call (FIRING + hide-acked + hide-read), Hide-acked toggle removes the acked filter, Acknowledge button only renders for unacked rows, bulk-delete confirmation dialog with count, delete buttons hidden for non-OPERATOR users, row-delete wires to useDeleteAlert + renders an Undo action. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>