fix: redesign note history disabled state with centered icon + better copy

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

memento-note/components/note-history-modal.tsx

@@ -4,7 +4,7 @@ import { useEffect, useMemo, useState, useTransition } from 'react'
 import { formatDistanceToNow } from 'date-fns'
 import { fr } from 'date-fns/locale/fr'
 import { enUS } from 'date-fns/locale/en-US'
-import { History, Loader2, RotateCcw, Trash2 } from 'lucide-react'
+import { History, Loader2, RotateCcw, Trash2, GitBranchPlus } from 'lucide-react'
 import { toast } from 'sonner'
 import { getNoteHistory, restoreNoteVersion, deleteNoteHistoryEntry } from '@/app/actions/notes'
 import { Button } from '@/components/ui/button'
@@ -136,11 +136,17 @@ export function NoteHistoryModal({
         </DialogHeader>
 
         {!enabled ? (
-          <div className="space-y-3 px-6 py-8">
-            <p className="text-sm text-muted-foreground">
-              {t('notes.historyDisabledDesc') || "L'historique est désactivé pour votre compte."}
+          <div className="flex flex-col items-center justify-center px-6 py-16 text-center">
+            <div className="flex h-16 w-16 items-center justify-center rounded-2xl bg-primary/10 mb-5">
+              <GitBranchPlus className="h-8 w-8 text-primary" />
+            </div>
+            <h3 className="text-base font-semibold text-foreground mb-1.5">
+              {t('notes.historyDisabledTitle') || 'Historique des versions'}
+            </h3>
+            <p className="text-sm text-muted-foreground max-w-xs mb-6 leading-relaxed">
+              {t('notes.historyDisabledDesc') || "Suivez les modifications de cette note au fil du temps. Activez l'historique pour commencer à enregistrer des versions."}
             </p>
-            <Button onClick={handleEnable} disabled={isEnabling}>
+            <Button onClick={handleEnable} disabled={isEnabling} size="lg" className="rounded-full px-8">
               {isEnabling && <Loader2 className="mr-2 h-4 w-4 animate-spin" />}
               {t('notes.enableHistory') || "Activer l'historique"}
             </Button>