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/app/api/briefing/route.ts

@@ -59,6 +59,7 @@ export async function GET() {
   const [
     recentNotes,
     inboxCount,
+    inboxPreview,
     dueFlashcards,
     upcomingReminders,
     unviewedInsights,
@@ -83,6 +84,13 @@ export async function GET() {
       where: { userId, notebookId: null, isArchived: false, trashedAt: null },
     }),
 
+    prisma.note.findMany({
+      where: { userId, notebookId: null, isArchived: false, trashedAt: null },
+      select: { id: true, title: true, notebookId: true, updatedAt: true },
+      orderBy: { updatedAt: 'desc' },
+      take: 3,
+    }),
+
     prisma.flashcard.count({
       where: { deck: { userId }, nextReviewAt: { lte: now } },
     }),
@@ -177,6 +185,12 @@ export async function GET() {
       notebook: n.notebookId ? notebookMap.get(n.notebookId) || null : null,
     })),
     inboxCount,
+    inboxPreview: inboxPreview.map(n => ({
+      id: n.id,
+      title: n.title,
+      notebookId: n.notebookId,
+      updatedAt: n.updatedAt.toISOString(),
+    })),
     dueFlashcards,
     upcomingReminders: upcomingReminders.map(r => ({
       id: r.id,