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/hooks/use-title-suggestions.ts

@@ -1,5 +1,6 @@
 import { useState, useEffect, useRef } from 'react'
 import { useDebounce } from './use-debounce'
+import { useAiConsent } from '@/components/legal/ai-consent-provider'
 
 export interface TitleSuggestion {
   title: string
@@ -13,6 +14,7 @@ interface UseTitleSuggestionsProps {
 }
 
 export function useTitleSuggestions({ content, enabled = true }: UseTitleSuggestionsProps) {
+  const { requestAiConsent, hasAiConsent } = useAiConsent()
   const [suggestions, setSuggestions] = useState<TitleSuggestion[]>([])
   const [isAnalyzing, setIsAnalyzing] = useState(false)
   const [error, setError] = useState<string | null>(null)
@@ -41,6 +43,14 @@ export function useTitleSuggestions({ content, enabled = true }: UseTitleSuggest
     abortRef.current = controller
 
     const generateTitles = async () => {
+      if (!hasAiConsent) {
+        const consented = await requestAiConsent()
+        if (!consented) {
+          setSuggestions([])
+          return
+        }
+      }
+
       setIsAnalyzing(true)
       setError(null)
 
@@ -73,7 +83,7 @@ export function useTitleSuggestions({ content, enabled = true }: UseTitleSuggest
     }
 
     generateTitles()
-  }, [debouncedContent, enabled])
+  }, [debouncedContent, enabled, hasAiConsent, requestAiConsent])
 
   // Cleanup on unmount
   useEffect(() => {