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/locales/en.json

@@ -321,6 +321,7 @@
     "switchType": "Switch to {type}",
     "saveNow": "Save now",
     "backToCollection": "Back to collection",
+    "backToDashboard": "Back to dashboard",
     "markdownEditingTitle": "Return to editing",
     "markdownPreviewTitle": "Preview",
     "brainstormThisIdea": "Brainstorm this idea",
@@ -4288,6 +4289,8 @@
     "toReview": "To review",
     "allCaughtUp": "All caught up.",
     "toOrganize": "to organize",
+    "inboxSeeAll": "See all {count}",
+    "inboxEmpty": "Inbox is empty.",
     "review": "Review",
     "cardsDue": "cards due",
     "reminders": "Reminders",