feat(notes): liens internes, onglet Réseau, living blocks et consentement IA

Rend les liens entre notes visibles et persistants (sync NoteLink au save, auto-save, graphe réseau rafraîchi), ajoute living blocks, Memory Echo, recherche globale, consentement IA explicite et consolide les prototypes design en architectural-grid.

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

memento-note/app/(main)/settings/data/page.tsx

@@ -1,7 +1,7 @@
 'use client'
 
 import { useState } from 'react'
-import { Download, Upload, Trash2, Loader2, RefreshCw, Sparkles, Database, ShieldAlert } from 'lucide-react'
+import { Download, Upload, Trash2, Loader2, RefreshCw, Sparkles, Database, ShieldAlert, FolderArchive } from 'lucide-react'
 import { toast } from 'sonner'
 import { useLanguage } from '@/lib/i18n'
 import { useSession } from 'next-auth/react'
@@ -20,6 +20,39 @@ export default function DataSettingsPage() {
   const [isDeleting, setIsDeleting] = useState(false)
   const [isReindexing, setIsReindexing] = useState(false)
   const [isCleaningUp, setIsCleaningUp] = useState(false)
+  const [isZipExporting, setIsZipExporting] = useState(false)
+
+  const handleZipExport = async () => {
+    setIsZipExporting(true)
+    try {
+      const response = await fetch('/api/user/export')
+      if (!response.ok) {
+        let message = t('dataManagement.zipExport.failed')
+        try {
+          const body = (await response.json()) as { error?: string }
+          if (body.error) message = body.error
+        } catch {
+          /* non-JSON error body */
+        }
+        toast.error(message)
+        return
+      }
+      const blob = await response.blob()
+      const url = window.URL.createObjectURL(blob)
+      const a = document.createElement('a')
+      a.href = url
+      a.download = `memento-workspace-export-${new Date().toISOString().split('T')[0]}.zip`
+      document.body.appendChild(a)
+      a.click()
+      document.body.removeChild(a)
+      window.URL.revokeObjectURL(url)
+      toast.success(t('dataManagement.zipExport.success'))
+    } catch {
+      toast.error(t('dataManagement.zipExport.failed'))
+    } finally {
+      setIsZipExporting(false)
+    }
+  }
 
   const handleExport = async () => {
     setIsExporting(true)
@@ -135,6 +168,18 @@ export default function DataSettingsPage() {
       onAction: handleExport,
       btnClass: 'bg-ink text-paper shadow-xl shadow-ink/20 hover:scale-[1.02] active:scale-95',
     },
+    {
+      icon: FolderArchive,
+      iconColor: 'text-amber-600 dark:text-amber-400',
+      iconBg: 'bg-amber-500/10 dark:bg-amber-500/20',
+      title: t('dataManagement.zipExport.title'),
+      description: t('dataManagement.zipExport.description'),
+      loading: isZipExporting,
+      loadingText: t('dataManagement.zipExporting'),
+      buttonText: t('dataManagement.zipExport.button'),
+      onAction: handleZipExport,
+      btnClass: 'bg-ink text-paper shadow-xl shadow-ink/20 hover:scale-[1.02] active:scale-95',
+    },
     {
       icon: Upload,
       iconColor: 'text-emerald-600 dark:text-emerald-400',