- Add `SkipLink` component to `src/components/ui`
- Integrate `SkipLink` in `src/App.tsx`
- Add `id="main-content"` and proper focus management to page containers
- Add translations for the skip link text
- Add unit test for `SkipLink`
Co-authored-by: ragusa-it <196988693+ragusa-it@users.noreply.github.com>
