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/components/admin-sidebar.tsx

@@ -13,6 +13,7 @@ import {
   User,
   LogOut,
   Brain,
+  CreditCard,
 } from 'lucide-react'
 import { cn } from '@/lib/utils'
 import { useLanguage } from '@/lib/i18n'
@@ -42,6 +43,11 @@ const ADMIN_NAV_ITEMS = [
     href: '/admin/ai',
     icon: Brain,
   },
+  {
+    titleKey: 'admin.sidebar.billing',
+    href: '/admin/billing',
+    icon: CreditCard,
+  },
   {
     titleKey: 'admin.sidebar.published',
     href: '/admin/published',

memento-note/components/editor-find-replace-bar.tsx

@@ -172,9 +172,14 @@ export function FindReplaceBar({ editor, onClose }: { editor: Editor; onClose: (
   const replaceAll = useCallback(() => {
     const ms = matchesRef.current
     if (ms.length === 0) return
+    // Sort descending by position so replacements don't shift earlier positions
     const sorted = [...ms].sort((a, b) => b.from - a.from)
-    editor.chain().focus()
-    sorted.forEach(m => editor.chain().insertContentAt({ from: m.from, to: m.to }, replaceText).run())
+    // Use a single ProseMirror transaction for all replacements
+    const tr = editor.state.tr
+    for (const m of sorted) {
+      tr.insertText(replaceText, m.from, m.to)
+    }
+    editor.view.dispatch(tr)
     matchesRef.current = []
     setCount(0)
     setCurrentIndex(-1)

memento-note/components/note-editor/note-editor-toolbar.tsx

@@ -260,7 +260,7 @@ export function NoteEditorToolbar({ mode, onClose, onToggleAttachments, attachme
         })
         // Emit events so the note list refreshes
         for (const ex of data.exercises || []) {
-          emitNoteChange({ type: 'created', noteId: ex.id, notebookId: note.notebookId })
+          emitNoteChange({ type: 'created', note: { ...note, id: ex.id, title: ex.title, content: '<p></p>' } as any })
         }
       }
     } catch (e: any) {

memento-note/components/settings/billing-plans.tsx

@@ -22,6 +22,7 @@ interface BillingStatus {
   currentPeriodEnd: string | null;
   cancelAtPeriodEnd: boolean;
   hasStripeSubscription: boolean;
+  billingEnabled?: boolean;
   prices?: {
     PRO: {
       month: { display: string; amount: number; currency: string };
@@ -34,11 +35,11 @@ interface BillingStatus {
   };
 }
 
-const billingEnabled = process.env.NEXT_PUBLIC_FEATURE_BILLING_ENABLED === 'true' || process.env.NODE_ENV === 'development';
+const billingEnabledEnvFallback = process.env.NEXT_PUBLIC_FEATURE_BILLING_ENABLED === 'true' || process.env.NODE_ENV === 'development';
 
 let stripePromise: ReturnType<typeof loadStripe> | null = null;
-function getStripePromise() {
-  if (!billingEnabled) return null;
+function getStripePromise(enabled: boolean) {
+  if (!enabled) return null;
   if (!stripePromise && process.env.NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY) {
     stripePromise = loadStripe(process.env.NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY);
   }
@@ -77,6 +78,8 @@ export function BillingPlans() {
   });
 
   const quotas = usageData?.quotas;
+  const billingEnabled = status?.billingEnabled ?? billingEnabledEnvFallback;
+  const stripe = getStripePromise(billingEnabled);
 
   useEffect(() => {
     const params = new URLSearchParams(window.location.search);
@@ -536,7 +539,7 @@ export function BillingPlans() {
             </h3>
           </div>
 
-          {billingEnabled && (
+          {billingEnabled ? (
             <div className="flex items-center gap-2 justify-center">
               <button
                 type="button"
@@ -560,6 +563,10 @@ export function BillingPlans() {
                 <span className="ms-1 text-primary/80 dark:text-primary">{t('billing.save')} ~17%</span>
               </button>
             </div>
+          ) : (
+            <p className="text-center text-sm text-muted-foreground px-4">
+              {t('billing.disabledByAdmin')}
+            </p>
           )}
 
           <div className={cn(
@@ -661,7 +668,7 @@ export function BillingPlans() {
             </div>
             <div className="p-2">
               <EmbeddedCheckoutProvider
-                stripe={getStripePromise()}
+                stripe={stripe}
                 options={{ clientSecret: checkoutClientSecret, onComplete: handleCheckoutComplete }}
               >
                 <EmbeddedCheckout />

memento-note/components/tiptap-callout-extension.tsx

@@ -166,7 +166,7 @@ export const CalloutExtension = Node.create({
 
   addKeyboardShortcuts() {
     return {
-      'Mod-Shift-C': () => this.editor.commands.insertContent({
+      'Mod-Alt-C': () => this.editor.commands.insertContent({
         type: this.name,
         attrs: { type: 'info' },
         content: [{ type: 'paragraph' }],

memento-note/components/tiptap-columns-extension.tsx

@@ -86,7 +86,7 @@ export const ColumnsExtension = Node.create({
 
   addKeyboardShortcuts() {
     return {
-      'Mod-Shift-L': () => this.editor.commands.insertContent({
+      'Mod-Alt-L': () => this.editor.commands.insertContent({
         type: this.name,
         attrs: { cols: 2 },
         content: [

memento-note/components/tiptap-link-preview-extension.tsx

@@ -43,7 +43,7 @@ const LinkPreviewView = ({ node, updateAttributes, deleteNode, selected }: any)
   }, [url, cached, updateAttributes])
 
   const unwrap = () => {
-    updateAttributes({ url: '', preview: null })
+    deleteNode()
   }
 
   const domain = (() => {

memento-note/components/tiptap-outline-extension.tsx

@@ -137,7 +137,7 @@ export const OutlineExtension = Node.create({
 
   addKeyboardShortcuts() {
     return {
-      'Mod-Shift-O': () => this.editor.commands.insertContent({
+      'Mod-Alt-O': () => this.editor.commands.insertContent({
         type: this.name,
       }),
     }