feat: dashboard Second Brain, essai 7 jours et vérification e-mail

Rendre le dashboard actionnable (inbox, peek, carte mentale), aligner la facturation sur l’essai 7 jours, et bloquer le login e-mail tant que l’adresse n’est pas confirmée.

Co-authored-by: Cursor <cursoragent@cursor.com>

memento-note/components/interactive-demo/demo-speak.tsx

@@ -26,7 +26,7 @@ export function DemoSpeak({ speak, className }: { speak: string; className?: str
 
     let md = marked.parse(withSlots, { gfm: true, breaks: true }) as string
     placeholders.forEach((frag, i) => {
-      md = md.replace(`%%KATEX${i}%%`, frag)
+      md = md.replace(`%%KATEX${i}%%`, () => frag)
     })
     return sanitizeRichHtml(md)
   }, [speak])