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/layout.tsx

@@ -93,8 +93,15 @@ export default async function RootLayout({
   const htmlTheme = serverHtmlThemeState(resolvedTheme)
   const serverAccent = userSettings.accentColor ?? '#A47148'
   const serverTheme = resolvedTheme
+  const wantsDarkClass =
+    resolvedTheme === 'dark' ||
+    resolvedTheme === 'midnight' ||
+    // auto : le serveur ne connaît pas prefers-color-scheme → laisser le script client
+    false
   const htmlStyle = {
     '--color-brand-accent': serverAccent,
+    // Aide le navigateur à peindre scrollbars/inputs dans le bon mode
+    colorScheme: wantsDarkClass || resolvedTheme === 'dark' || resolvedTheme === 'midnight' ? 'dark' : resolvedTheme === 'light' ? 'light' : undefined,
   } as CSSProperties
 
   return (