fix(chart): prevent infinite loops and remove hardcoded text

- Memoize ChartWrapper to prevent infinite re-renders in MarkdownContent
- Remove hardcoded French text (multilingual app)
- Return null for invalid charts instead of error messages

memento-note/components/note-chart.tsx

@@ -182,7 +182,7 @@ function NoteChart({ type, title, data, colors, showLegend, height = 250 }: Note
       }
 
       default:
-        return <div className="text-center text-muted-foreground py-8">Type de graphique non supporté: {type}</div>
+        return null
     }
   }
 
@@ -246,6 +246,6 @@ export function parseChartFromCode(code: string): NoteChartProps | null {
 
 export function NoteChartFromCode({ code }: { code: string }) {
   const props = useMemo(() => parseChartFromCode(code), [code])
-  if (!props) return <div className="text-center text-muted-foreground py-4">Format de graphique invalide</div>
+  if (!props) return null
   return <NoteChart {...props} />
 }