fix: batch priorités — thème, scroll, wizard, agents, slides, charts, packs

Anti-flash dark (color-scheme + applyDocumentTheme), scroll pages publiques,
prompts wizard/slides moins génériques, cron agents rattrapage nextRun null,
slides carnet via notebookId, graphiques à 2 crédits + hint, audit dashboard,
packs Stripe marqués non configurés sans price ID.

memento-note/app/(public)/layout.tsx

@@ -19,8 +19,8 @@ export default async function PublicLayout({ children }: { children: React.React
     <PublicProviders initialLanguage={initialLanguage} initialTranslations={initialTranslations}>
       <div
         data-public-scroll-root
-        className="fixed inset-0 z-0 overflow-y-auto overflow-x-hidden overscroll-y-contain"
-        style={{ WebkitOverflowScrolling: 'touch' }}
+        className="fixed inset-0 z-[1] h-[100dvh] w-full overflow-y-auto overflow-x-hidden overscroll-y-contain"
+        style={{ WebkitOverflowScrolling: 'touch', touchAction: 'pan-y' }}
       >
         {children}
       </div>