fix: 5 bugs critiques de l'éditeur (Phase 1 audit)

1. replaceAll (Find & Replace) — une seule transaction ProseMirror
   au lieu d'un forEach cassé. Tous les matchs sont maintenant remplacés.

2. Link Preview unwrap — deleteNode() au lieu de clearer les attrs
   qui laissaient un nœud fantôme invisible dans le document.

3. Conversion Markdown → richtext — breaks: true dans marked.parse()
   Les simple newlines sont maintenant convertis en <br>.
   + préserve les blocs custom (toggle, callout, math, columns,
   outline, link-preview) en commentaires HTML lors de l'export MD.

4. emitNoteChange exercices — shape corrigée (type:'created' attend
   un objet Note, pas noteId/notebookId séparés).

5. Raccourcis clavier sans conflit :
   Cmd+Shift+C → Cmd+Alt+C (callout, avant: copier)
   Cmd+Shift+O → Cmd+Alt+O (outline, avant: historique/signets)
   Cmd+Shift+L → Cmd+Alt+L (colonnes, avant: lock screen macOS)

memento-note/tests/unit/billing-price-map.test.ts

@@ -1,6 +1,14 @@
-import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
 import { resolvePriceId, priceIdToTier } from '@/lib/billing/stripe-prices';
 
+vi.mock('@/lib/prisma', () => ({
+  default: {
+    systemConfig: {
+      findMany: vi.fn().mockResolvedValue([]),
+    },
+  },
+}));
+
 describe('billing-price-map', () => {
   const originalEnv = process.env;
 
@@ -19,55 +27,55 @@ describe('billing-price-map', () => {
   });
 
   describe('resolvePriceId', () => {
-    it('returns PRO monthly price ID', () => {
-      expect(resolvePriceId('PRO', 'month')).toBe('price_pro_monthly_test');
+    it('returns PRO monthly price ID', async () => {
+      expect(await resolvePriceId('PRO', 'month')).toBe('price_pro_monthly_test');
     });
 
-    it('returns PRO annual price ID', () => {
-      expect(resolvePriceId('PRO', 'year')).toBe('price_pro_annual_test');
+    it('returns PRO annual price ID', async () => {
+      expect(await resolvePriceId('PRO', 'year')).toBe('price_pro_annual_test');
     });
 
-    it('returns BUSINESS monthly price ID', () => {
-      expect(resolvePriceId('BUSINESS', 'month')).toBe('price_business_monthly_test');
+    it('returns BUSINESS monthly price ID', async () => {
+      expect(await resolvePriceId('BUSINESS', 'month')).toBe('price_business_monthly_test');
     });
 
-    it('returns BUSINESS annual price ID', () => {
-      expect(resolvePriceId('BUSINESS', 'year')).toBe('price_business_annual_test');
+    it('returns BUSINESS annual price ID', async () => {
+      expect(await resolvePriceId('BUSINESS', 'year')).toBe('price_business_annual_test');
     });
 
-    it('throws if env variable is not set', () => {
+    it('throws if env variable is not set', async () => {
       delete process.env.STRIPE_PRICE_PRO_MONTHLY;
-      expect(() => resolvePriceId('PRO', 'month')).toThrow();
+      await expect(resolvePriceId('PRO', 'month')).rejects.toThrow();
     });
   });
 
   describe('priceIdToTier', () => {
-    it('resolves PRO monthly price ID to PRO tier', () => {
-      expect(priceIdToTier('price_pro_monthly_test')).toBe('PRO');
+    it('resolves PRO monthly price ID to PRO tier', async () => {
+      expect(await priceIdToTier('price_pro_monthly_test')).toBe('PRO');
     });
 
-    it('resolves PRO annual price ID to PRO tier', () => {
-      expect(priceIdToTier('price_pro_annual_test')).toBe('PRO');
+    it('resolves PRO annual price ID to PRO tier', async () => {
+      expect(await priceIdToTier('price_pro_annual_test')).toBe('PRO');
     });
 
-    it('resolves BUSINESS monthly price ID to BUSINESS tier', () => {
-      expect(priceIdToTier('price_business_monthly_test')).toBe('BUSINESS');
+    it('resolves BUSINESS monthly price ID to BUSINESS tier', async () => {
+      expect(await priceIdToTier('price_business_monthly_test')).toBe('BUSINESS');
     });
 
-    it('resolves BUSINESS annual price ID to BUSINESS tier', () => {
-      expect(priceIdToTier('price_business_annual_test')).toBe('BUSINESS');
+    it('resolves BUSINESS annual price ID to BUSINESS tier', async () => {
+      expect(await priceIdToTier('price_business_annual_test')).toBe('BUSINESS');
     });
 
-    it('returns null for unknown price ID', () => {
-      expect(priceIdToTier('price_unknown_xyz')).toBeNull();
+    it('returns null for unknown price ID', async () => {
+      expect(await priceIdToTier('price_unknown_xyz')).toBeNull();
     });
 
-    it('returns null when env variables are not set', () => {
+    it('returns null when env variables are not set', async () => {
       delete process.env.STRIPE_PRICE_PRO_MONTHLY;
       delete process.env.STRIPE_PRICE_PRO_ANNUAL;
       delete process.env.STRIPE_PRICE_BUSINESS_MONTHLY;
       delete process.env.STRIPE_PRICE_BUSINESS_ANNUAL;
-      expect(priceIdToTier('price_pro_monthly_test')).toBeNull();
+      expect(await priceIdToTier('price_pro_monthly_test')).toBeNull();
     });
   });
 });

memento-note/tests/unit/entitlements.test.ts

@@ -22,6 +22,9 @@ vi.mock('@/lib/prisma', () => ({
     subscription: {
       findUnique: vi.fn(),
     },
+    planEntitlement: {
+      findMany: vi.fn().mockResolvedValue([]),
+    },
   },
 }));