refactor: date utils and all calls

src/components/charts/CompletionTrendChart.tsx

@@ -2,6 +2,7 @@
 
 import { LineChart, Line, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer } from 'recharts';
 import { Card } from '@/components/ui/Card';
+import { parseDate, formatDateShort } from '@/lib/date-utils';
 
 interface CompletionTrendData {
   date: string;
@@ -18,11 +19,11 @@ interface CompletionTrendChartProps {
 export function CompletionTrendChart({ data, title = "Tendance de Completion" }: CompletionTrendChartProps) {
   // Formatter pour les dates
   const formatDate = (dateStr: string) => {
-    const date = new Date(dateStr);
-    return date.toLocaleDateString('fr-FR', { 
-      day: 'numeric', 
-      month: 'short' 
-    });
+    try {
+      return formatDateShort(parseDate(dateStr));
+    } catch {
+      return dateStr;
+    }
   };
 
   // Tooltip personnalisé