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/(main)/insights/page.tsx

@@ -2,7 +2,7 @@
 
 import { useState, useEffect, useMemo, useCallback } from 'react'
 import dynamic from 'next/dynamic'
-import { useRouter } from 'next/navigation'
+import { useRouter, useSearchParams } from 'next/navigation'
 import { useLanguage } from '@/lib/i18n'
 import { motion, AnimatePresence, useReducedMotion } from 'motion/react'
 import {
@@ -84,6 +84,7 @@ const COLOR_PALETTE = ['#F87171', '#60A5FA', '#34D399', '#FBBF24', '#A78BFA', '#
 
 export default function InsightsPage() {
   const router = useRouter()
+  const searchParams = useSearchParams()
   const { t, language: locale } = useLanguage()
 
   const formatSyncTime = useCallback(
@@ -129,6 +130,15 @@ export default function InsightsPage() {
     loadInitialData()
   }, [])
 
+  useEffect(() => {
+    const clusterParam = searchParams.get('cluster')
+    if (!clusterParam || clusters.length === 0) return
+    const match = clusters.find(
+      c => c.id === clusterParam || String(c.clusterId) === clusterParam,
+    )
+    if (match) setSelectedClusterId(match.id)
+  }, [searchParams, clusters])
+
   // ─── Données calculées ───────────────────────────────────────────────────────
 
   const selectedCluster = useMemo(