feat(dashboard): tableau de bord Second Brain configurable avec chargement progressif

Briefing granulaire, pistes rapides puis enrichissement async, layout persisté v5,
suggestions agents, intégration Gmail et navigation sidebar alignée sur /home.

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

memento-note/components/personas-panel.tsx

@@ -9,6 +9,7 @@ import {
 import { cn } from '@/lib/utils'
 import { MarkdownContent } from '@/components/markdown-content'
 import { useAiConsent } from '@/components/legal/ai-consent-provider'
+import { useLanguage } from '@/lib/i18n'
 
 // ── Personas definition ──────────────────────────────────────────────────────
 
@@ -87,6 +88,7 @@ interface PersonasPanelProps {
 
 export function PersonasPanel({ noteTitle, noteContent }: PersonasPanelProps) {
   const { requestAiConsent } = useAiConsent()
+  const { t } = useLanguage()
   const [loadingId, setLoadingId] = useState<PersonaId | null>(null)
   const [results, setResults] = useState<Map<PersonaId, PersonaResult>>(new Map())
   const [expanded, setExpanded] = useState<PersonaId | null>(null)
@@ -122,7 +124,7 @@ export function PersonasPanel({ noteTitle, noteContent }: PersonasPanelProps) {
         body: JSON.stringify({ content: noteContent, title: noteTitle, personaId }),
       })
       const data = await res.json()
-      if (!res.ok) throw new Error(data.error || 'Erreur')
+      if (!res.ok) throw new Error(data.error || t('common.error'))
       setResults(prev => new Map(prev).set(personaId, data))
       setExpanded(personaId)
     } catch {