feat: Implement conversion rate as (Completed Orders / Total Orders) × 100 and fix Recharts prop warning

admin-spa/src/routes/Dashboard/index.tsx

@@ -511,8 +511,8 @@ export default function Dashboard() {
             >
               <Pie
                 data={sortedOrderStatus}
-                dataKey={(entry) => entry.count || entry.value || 0}
-                nameKey={(entry) => entry.status || entry.name || 'Unknown'}
+                dataKey="count"
+                nameKey="status"
                 cx="50%"
                 cy="50%"
                 innerRadius={70}