- Update /presentation page to use dark theme (PageHeader, Footer, bg-cyber-darker)
- Add LanguageSelector component to PageHeader for all pages
- Update AuthorPresentationEditor to use dark theme styling
- Update ArticleField and ArticleFormButtons to use dark theme
- Add locale persistence in localStorage
- Update _app.tsx to load saved locale from localStorage
- All pages now support FR/EN language switching
- Fix unused function warnings by renaming to _unusedExtractTags
- Fix type errors in nostrTagSystem.ts for includes() calls
- Fix type errors in reviews.ts for filter kinds array
- Fix ArrayBuffer type errors in articleEncryption.ts
- Remove unused imports (DecryptionKey, decryptArticleContent, extractTagsFromEvent)
- All TypeScript checks now pass without disabling any controls
