fix: normalizeSlide transforme {label,value} → {name,value} pour recharts

Le graphe était noir car recharts cherchait xKey='name' mais les données
avaient {label,value}. Fix dans normalizeSlide case 'chart':
- data.map({label,value} → {name,value})
- xKey: 'name', yKeys: ['value'] explicitement

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

memento-note/components/lab/slides-renderer.tsx

@@ -25,21 +25,10 @@ const GRID_STROKE = 'rgba(255,255,255,0.07)'
 
 // ── Chart ──────────────────────────────────────────────────────────────────────
 function SlideChart({ slide }: { slide: SlideSpec }) {
-  // Support both old format (slide.chart) and new flat format (slide.chartType + slide.data)
+  const chart = slide.chart
-  const chart = slide.chart ?? (
-    slide.chartType || slide.data
-      ? {
-          type: slide.chartType ?? 'bar',
-          data: (slide.data as any[])?.map((d: any) => ({ name: d.label ?? d.name, value: d.value })) ?? [],
-          xKey: 'name',
-          yKeys: ['value'],
-          showLegend: true,
-        }
-      : undefined
-  )
   if (!chart?.data?.length) return null
 
-  const colors = chart.colors ?? CHART_COLORS
+  const colors = (chart as any).colors ?? CHART_COLORS
   const xKey   = chart.xKey ?? 'name'
   const yKeys  = chart.yKeys ?? Object.keys(chart.data[0]).filter(k => k !== xKey)
   const legend = chart.showLegend !== false && yKeys.length > 1
@@ -580,7 +569,13 @@ function normalizeSlide(slide: any, index: number): SlideSpec {
         layout: 'chart',
         chart: {
           type: slide.chartType ?? 'bar',
-          data: slide.data ?? []
+          // Normalize {label,value} → {name,value} so recharts xKey='name' works
+          data: (slide.data ?? []).map((d: any) => ({
+            name: d.label ?? d.name ?? '',
+            value: typeof d.value === 'number' ? d.value : Number(d.value) || 0,
+          })),
+          xKey: 'name',
+          yKeys: ['value'],
         },
         notes: slide.notes
       }