feat: translate CSV export headers to pt-BR and format currency values

src/pages/Clients.tsx

@@ -126,7 +126,16 @@ const Clients = () => {
           </div>
           
           <button
-            onClick={() => exportToCSV(clientsData, `clientes_${new Date().toISOString().split('T')[0]}.csv`)}
+            onClick={() => {
+              const exportData = clientsData.map(client => ({
+                'Nome do Cliente': client.name,
+                'Total Gasto (R$)': client.totalSpent.toFixed(2).replace('.', ','),
+                'Produtos Comprados': client.totalItems,
+                'Total de Pedidos': client.orderCount,
+                'Última Compra': new Date(client.lastPurchase).toLocaleDateString('pt-BR')
+              }));
+              exportToCSV(exportData, `clientes_${new Date().toISOString().split('T')[0]}.csv`);
+            }}
             className="flex items-center justify-center gap-2 bg-dark-card border border-dark-border px-4 py-2.5 rounded-xl shadow-sm hover:border-brand-primary transition-colors text-sm font-medium text-dark-text cursor-pointer"
             title="Exportar para CSV"
           >

src/pages/Products.tsx

@@ -91,7 +91,16 @@ const Products = () => {
           </div>
           
           <button
-            onClick={() => exportToCSV(productsData, `produtos_${new Date().toISOString().split('T')[0]}.csv`)}
+            onClick={() => {
+              const exportData = productsData.map(product => ({
+                'ID Produto': product.id,
+                'Descrição': product.name,
+                'Preço Atual (R$)': product.lastPrice.toFixed(2).replace('.', ','),
+                'Total Vendido (un.)': product.totalSold,
+                'Receita Gerada (R$)': product.revenue.toFixed(2).replace('.', ',')
+              }));
+              exportToCSV(exportData, `produtos_${new Date().toISOString().split('T')[0]}.csv`);
+            }}
             className="flex items-center justify-center gap-2 bg-dark-card border border-dark-border px-4 py-2.5 rounded-xl shadow-sm hover:border-brand-primary transition-colors text-sm font-medium text-dark-text cursor-pointer"
             title="Exportar para CSV"
           >