**Motivations:**
- Allow users to set their preferred language (fr/en) in the settings page
- Load language preference from localStorage at startup to configure the application locale
**Root causes:**
- Language preference was only available in the header via LanguageSelector component
- Language preference was stored in IndexedDB instead of localStorage
- No centralized language settings management in the settings page
**Correctifs:**
- Created LanguageSettingsManager component for settings page
- Migrated language storage from IndexedDB to localStorage for consistency
- Updated _app.tsx to load locale from localStorage synchronously at startup
- Updated useI18n hook to use localStorage instead of IndexedDB
- Updated LanguageSelector component to use localStorage instead of IndexedDB
**Evolutions:**
- Added language preference section in settings page (displayed first)
- Language preference is now loaded at application startup from localStorage
- Added translations for language settings (settings.language.*)
**Pages affectées:**
- components/LanguageSettingsManager.tsx (new)
- pages/settings.tsx
- pages/_app.tsx
- hooks/useI18n.ts
- components/LanguageSelector.tsx
- locales/fr.txt
- locales/en.txt
**Motivations:**
- The author page was displaying the raw note content (visible part) instead of using the structured JSON data
- This caused elements like 'Nouveau profil publié sur zapwall.fr' to appear, which should not be visible
- The page should follow the structure of the creation form for consistency
**Root causes:**
- AuthorPageHeader was using presentation.content which contains the raw note visible content
- The structured data (description, contentDescription) extracted from JSON tags was not being used for display
**Correctifs:**
- Modified AuthorPageHeader to use presentation.description and presentation.contentDescription instead of presentation.content
- Extract author name from title (format: 'Présentation de <name>')
- Display structured fields following the creation form structure: presentation personnelle and description du contenu
- Fixed TypeScript errors for null/undefined handling
**Evolutions:**
- Author page now displays data in a structured way matching the creation form
- Better user experience with clear sections for presentation and content description
**Pages affectées:**
- pages/author/[pubkey].tsx
- 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
