fix: images, couverture, slash, agents, wizard, Stripe et admin

- Collage/accès images: ownership path userId + meta legacy, 403 non caché
- Couverture note: explicite (choix/aucune), plus d’auto depuis le corps
- Éditeur: suppression image TipTap, sync immédiate, toolbar réordonnée
- Slash: listes par titre (plus d’index), keywords nettoyés
- Agents: nextRun à la réactivation, cron sans stampede null
- Wizard: titres courts + mode Expert plus robuste
- Stripe checkout hosted fiable; admin métriques live; dark mode IA/settings
- Indexation notes courtes + test unit aligné

memento-note/components/note-editor/note-editor-full-page.tsx

@@ -4,7 +4,7 @@ import { useNoteEditorContext } from './note-editor-context'
 import { NoteEditorToolbar } from './note-editor-toolbar'
 import { NoteTitleBlock } from './note-title-block'
 import { NoteContentArea } from './note-content-area'
-import { EditorImages } from '@/components/editor-images'
+import { NoteCoverHero } from './note-cover-hero'
 import { ComparisonModal } from '@/components/comparison-modal'
 import { FusionModal } from '@/components/fusion-modal'
 import { ReminderDialog } from '@/components/reminder-dialog'
@@ -119,16 +119,15 @@ export function NoteEditorFullPage({ onClose }: NoteEditorFullPageProps) {
               )}
             </div>
 
-            {/* Hero image — show first note image if present */}
-            {state.allImages.length > 0 && (
-              <div className="aspect-[16/9] w-full bg-slate-100 dark:bg-zinc-900 rounded-xl overflow-hidden shadow-xl">
-                <img
-                  src={state.allImages[0]}
-                  alt={state.title}
-                  className="w-full h-full object-cover grayscale contrast-110 hover:grayscale-0 transition-all duration-500"
-                />
-              </div>
-            )}
+            {/* Couverture explicite — pas d'auto-promo des images collées dans le corps */}
+            <NoteCoverHero
+              coverUrl={state.coverImage}
+              candidates={state.allImages}
+              readOnly={readOnly}
+              title={state.title}
+              onSetCover={actions.setCoverImage}
+              onClearCover={actions.clearCoverImage}
+            />
 
             {/* Content area — max-w-4xl for wider reading column */}
             <div className="max-w-4xl mx-auto w-full space-y-8 pb-32">