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/lib/entitlements.ts

@@ -73,8 +73,8 @@ export class QuotaExceededError extends Error {
 const TIER_LIMITS: Record<SubscriptionTier, Record<string, number | 'unlimited'>> = {
   BASIC: {
     semantic_search: 30,
-    auto_tag: 20,
-    auto_title: 10,
+    auto_tag: 15,
+    auto_title: 5,
     brainstorm_create: 1,
     brainstorm_expand: 10,
     brainstorm_enrich: 20,
@@ -85,8 +85,8 @@ const TIER_LIMITS: Record<SubscriptionTier, Record<string, number | 'unlimited'>
     auto_tag: 200,
     auto_title: 200,
     reformulate: 50,
-    chat: 100,
-    brainstorm_create: 30,
+    chat: 50,
+    brainstorm_create: 5,
     brainstorm_expand: 100,
     brainstorm_enrich: 200,
     suggest_charts: 50,
@@ -96,8 +96,8 @@ const TIER_LIMITS: Record<SubscriptionTier, Record<string, number | 'unlimited'>
     auto_tag: 1000,
     auto_title: 1000,
     reformulate: 500,
-    chat: 1000,
-    brainstorm_create: 200,
+    chat: 500,
+    brainstorm_create: 'unlimited',
     brainstorm_expand: 500,
     brainstorm_enrich: 1000,
     suggest_charts: 200,