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/app/(main)/layout.tsx

@@ -30,7 +30,11 @@ export default async function MainLayout({
   const showAIAssistant = aiSettings?.paragraphRefactor !== false;
 
   return (
-    <ProvidersWrapper initialLanguage={initialLanguage} initialTranslations={initialTranslations}>
+    <ProvidersWrapper
+      initialLanguage={initialLanguage}
+      initialTranslations={initialTranslations}
+      initialAiProcessingConsent={aiSettings?.aiProcessingConsent === true}
+    >
       {/* No top-bar header — sidebar-only navigation (architectural-grid design) */}
       <div className="flex h-screen overflow-hidden bg-memento-desk dark:bg-background">
         <Suspense fallback={<div className="hidden w-80 shrink-0 md:block" />}>