- Removed the Videos feed and the "Market movement vs the model" card from
the match Summary tab (and the now-orphaned OddsMovement component, the
odds-history fetch, and the dead i18n keys).
- New WhatsNew modal (src/components/WhatsNew.tsx, mounted in RootLayout):
on first visit after a deploy it shows the changelog entries the visitor
hasn't seen yet, then records the version in localStorage. Bilingual,
driven by public/data/changelog.json (en+de per entry); silent once the
visitor is current. Bump changelog.json's top entry each deploy.
Gates: 170 tests, build, typecheck:server — all green.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
