## What and why

<!-- What does this change, and what problem does it solve? Link the issue if there is one. -->

## How it was checked

- [ ] `npm run lint` and `npm test` pass in `frontend/`
- [ ] `npm run test:e2e` passes (it also runs the accessibility audit and the every-control gate)
- [ ] New or changed controls carry a `tid` (test id) and are exercised by a test
- [ ] Screens look right in light and dark, on a phone width and on desktop
- [ ] Docs (README, `backend/README.md`) updated if behaviour or setup changed

## Notes for the reviewer

<!-- Anything surprising, trade-offs taken, follow-ups left out on purpose. -->