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/components/note-editor/note-title-block.tsx

@@ -4,12 +4,14 @@ import { useNoteEditorContext } from './note-editor-context'
 import { TitleSuggestions } from '@/components/title-suggestions'
 import { Loader2, Sparkles } from 'lucide-react'
 import { useLanguage } from '@/lib/i18n'
+import { useAiConsent } from '@/components/legal/ai-consent-provider'
 import { cn } from '@/lib/utils'
 import { toast } from 'sonner'
 
 export function NoteTitleBlock() {
   const { state, actions, readOnly, fullPage } = useNoteEditorContext()
   const { t } = useLanguage()
+  const { requestAiConsent } = useAiConsent()
 
   if (fullPage) {
     // Adaptive font size: short = big editorial, long = smaller but still premium
@@ -64,6 +66,8 @@ export function NoteTitleBlock() {
                   toast.error(t('ai.titleGenerationMinWords', { count: wordCount }))
                   return
                 }
+                const consented = await requestAiConsent()
+                if (!consented) return
                 actions.setIsProcessingAI(true)
                 try {
                   const res = await fetch('/api/ai/title-suggestions', {