- Add ArticleHistoryEntry/ArticleHistoryResponse types
- Add articleHistoryApi client (list + getProvenance endpoints)
- Add ArticleHistory page with status/source_type filters and pagination
- Add collapsible provenance section to SynthesisDetail
- Register /article-history route in App.tsx
- Add viewHistory link in Settings near articleHistoryDays input
- Add all French i18n strings for article history feature
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>