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/contextual-ai-chat.tsx

@@ -22,6 +22,7 @@ import { exportExcalidrawSceneToPngBlob } from '@/lib/client/excalidraw-export-i
 import { useLanguage } from '@/lib/i18n'
 import { MarkdownContent } from '@/components/markdown-content'
 import { toast } from 'sonner'
+import { useAiConsent } from '@/components/legal/ai-consent-provider'
 
 // ── Custom Toast Helper ──────────────────────────────────────────────────────
 const mToast = {
@@ -195,6 +196,7 @@ export function ContextualAIChat({
 }: ContextualAIChatProps) {
   const { t, language } = useLanguage()
   const webSearchAvailable = useWebSearchAvailable()
+  const { requestAiConsent } = useAiConsent()
 
   const [activeTab, setActiveTab] = useState<'chat' | 'actions' | 'resource'>('actions')
   const [selectedTone, setSelectedTone] = useState('professional')
@@ -282,6 +284,11 @@ export function ContextualAIChat({
   const handleSend = async () => {
     const text = input.trim()
     if (!text || isLoading) return
+
+    // GDPR AI Consent Check
+    const consented = await requestAiConsent()
+    if (!consented) return
+
     setInput('')
     try {
       await sendMessage({ text }, { body: buildChatBody() })
@@ -293,6 +300,10 @@ export function ContextualAIChat({
 
   // ── Action execution ────────────────────────────────────────────────────────
   const handleAction = async (action: ActionDef, targetLang?: string) => {
+    // GDPR AI Consent Check
+    const consented = await requestAiConsent()
+    if (!consented) return
+
     if (action.isImageAction) {
       if (!noteImages || noteImages.length === 0) {
         mToast.error(t('ai.noImagesError') || 'Aucune image dans cette note')
@@ -511,6 +522,10 @@ export function ContextualAIChat({
       return
     }
 
+    // GDPR AI Consent Check
+    const consented = await requestAiConsent()
+    if (!consented) return
+
     setResourceEnriching(true)
     try {
       const res = await fetch('/api/ai/enrich-from-resource', {
@@ -552,6 +567,10 @@ export function ContextualAIChat({
       return
     }
 
+    // GDPR AI Consent Check
+    const consented = await requestAiConsent()
+    if (!consented) return
+
     setResourceEnriching(true)
     try {
       const res = await fetch('/api/ai/enrich-from-resource', {