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/actions/ai-settings.ts

@@ -24,6 +24,7 @@ export type UserAISettingsData = {
   noteHistoryMode?: 'manual' | 'auto'
   fontFamily?: 'inter' | 'playfair' | 'jetbrains' | 'system'
   autoSave?: boolean
+  aiProcessingConsent?: boolean
 }
 
 /** Only fields that exist on `UserAISettings` in Prisma (excludes e.g. `theme`, which lives on `User`). */
@@ -47,6 +48,7 @@ const USER_AI_SETTINGS_PRISMA_KEYS = [
   'noteHistoryMode',
   'fontFamily',
   'autoSave',
+  'aiProcessingConsent',
 ] as const
 
 type UserAISettingsPrismaKey = (typeof USER_AI_SETTINGS_PRISMA_KEYS)[number]
@@ -150,6 +152,7 @@ const getCachedAISettings = unstable_cache(
           noteHistoryMode: 'manual' as const,
           fontFamily: 'inter' as const,
           autoSave: true,
+          aiProcessingConsent: false,
         }
       }
 
@@ -175,6 +178,7 @@ const getCachedAISettings = unstable_cache(
         noteHistoryMode: (settings.noteHistoryMode ?? 'manual') as 'manual' | 'auto',
         fontFamily: (settings.fontFamily || 'inter') as 'inter' | 'playfair' | 'jetbrains' | 'system',
         autoSave: settings.autoSave ?? true,
+        aiProcessingConsent: settings.aiProcessingConsent ?? false,
       }
     } catch (error) {
       console.error('Error getting AI settings:', error)
@@ -200,6 +204,7 @@ const getCachedAISettings = unstable_cache(
         noteHistoryMode: 'manual' as const,
         fontFamily: 'inter' as const,
         autoSave: true,
+        aiProcessingConsent: false,
       }
     }
   },
@@ -238,6 +243,7 @@ export async function getAISettings(userId?: string) {
       noteHistoryMode: 'manual' as const,
       fontFamily: 'inter' as const,
       autoSave: true,
+      aiProcessingConsent: false,
     }
   }