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/markdown-content.tsx

@@ -1,6 +1,6 @@
 'use client'
 
-import { memo } from 'react'
+import { memo, useMemo } from 'react'
 import ReactMarkdown from 'react-markdown'
 import remarkGfm from 'remark-gfm'
 import remarkMath from 'remark-math'
@@ -9,6 +9,11 @@ import rehypeRaw from 'rehype-raw'
 import 'katex/dist/katex.min.css'
 import { NoteChartFromCode } from './note-chart'
 
+// Memoized wrapper to prevent infinite re-renders
+const ChartWrapper = memo(function ChartWrapper({ code }: { code: string }) {
+  return <NoteChartFromCode code={code} />
+})
+
 interface MarkdownContentProps {
   content: string
   className?: string
@@ -28,9 +33,10 @@ export const MarkdownContent = memo(function MarkdownContent({ content, classNam
             const match = /language-(\w+)/.exec(className || '')
             const language = match ? match[1] : ''
 
-            // Chart code blocks
+            // Chart code blocks - memoized to prevent infinite loops
             if (language === 'chart') {
-              return <NoteChartFromCode code={String(children).replace(/\n$/, '')} />
+              const chartCode = String(children).replace(/\n$/, '')
+              return <ChartWrapper key={chartCode.slice(0, 50)} code={chartCode} />
             }
 
             // Other code blocks

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} />
 }