## Summary - add focus trapping and ESC key handling so the dialog is keyboard friendly - improve ARIA labelling (`role="dialog"`, `aria-labelledby`, `aria-describedby`) and ensure buttons announce their purpose - write a component test (React Testing Library + user-event) to cover keyboard navigation across the radio list and action buttons ## Acceptance Criteria - opening the dialog moves focus to the first radio and keeps focus inside until closed - pressing ESC or clicking the backdrop calls `onClose` - automated test verifies tab/shift+tab order and has no axe-core violations
