feat(notes): liens internes, onglet Réseau, living blocks et consentement IA

Rend les liens entre notes visibles et persistants (sync NoteLink au save, auto-save, graphe réseau rafraîchi), ajoute living blocks, Memory Echo, recherche globale, consentement IA explicite et consolide les prototypes design en architectural-grid.

Co-authored-by: Cursor <cursoragent@cursor.com>

memento-note/lib/i18n/LanguageProvider.tsx

@@ -58,25 +58,24 @@ export function LanguageProvider({ children, initialLanguage = 'en', initialTran
     }
   }, [initialLanguage])
 
-  // Load translations when language changes (with caching)
-  // On first render, skip updateDocumentDirection since the inline script already set it.
+  // Always reload locale JSON on the client so new i18n keys are picked up
+  // (SSR initialTranslations may be stale until the next deploy).
   useEffect(() => {
-    const cached = cacheRef.current.get(language)
-    if (cached) {
-      setTranslations(cached)
-      if (!isFirstRender.current) updateDocumentDirection(language)
-      isFirstRender.current = false
-      return
-    }
+    let cancelled = false
 
     const loadLang = async () => {
       const loaded = await loadTranslations(language)
+      if (cancelled) return
       cacheRef.current.set(language, loaded)
       setTranslations(loaded)
       if (!isFirstRender.current) updateDocumentDirection(language)
       isFirstRender.current = false
     }
+
     loadLang()
+    return () => {
+      cancelled = true
+    }
   }, [language])
 
   const setLanguage = useCallback((lang: SupportedLanguage) => {
@@ -90,8 +89,10 @@ export function LanguageProvider({ children, initialLanguage = 'en', initialTran
     if (!translations) return key
 
     let value: any = getTranslationValue(translations, key)
+    if (value === key && language !== 'en') {
+      value = getTranslationValue(enTranslations as unknown as Translations, key)
+    }
 
-    // Replace parameters like {count}, {percentage}, etc.
     if (params && typeof value === 'string') {
       Object.entries(params).forEach(([param, paramValue]) => {
         value = value.replace(`{${param}}`, String(paramValue))
@@ -99,7 +100,7 @@ export function LanguageProvider({ children, initialLanguage = 'en', initialTran
     }
 
     return typeof value === 'string' ? value : key
-  }, [translations])
+  }, [translations, language])
 
   const value = useMemo(() => ({ language, setLanguage, t, translations }), [language, setLanguage, t, translations])