feat: add CSV export functionality to Clients and Products pages

src/dataService.ts

@@ -69,3 +69,36 @@ export const parseOrderDate = (dateStr: string): Date => {
   const fallback = new Date(dateStr);
   return isNaN(fallback.getTime()) ? new Date(0) : fallback;
 };
+
+export const exportToCSV = (data: any[], filename: string) => {
+  if (!data || !data.length) return;
+  
+  const headers = Object.keys(data[0]);
+  const csvRows = [];
+  
+  // Add headers
+  csvRows.push(headers.join(','));
+  
+  // Add rows
+  for (const row of data) {
+    const values = headers.map(header => {
+      const val = row[header];
+      const escaped = ('' + val).replace(/"/g, '\\"');
+      return `"${escaped}"`;
+    });
+    csvRows.push(values.join(','));
+  }
+  
+  const csvString = csvRows.join('\n');
+  const blob = new Blob([csvString], { type: 'text/csv;charset=utf-8;' });
+  const link = document.createElement('a');
+  if (link.download !== undefined) {
+    const url = URL.createObjectURL(blob);
+    link.setAttribute('href', url);
+    link.setAttribute('download', filename);
+    link.style.visibility = 'hidden';
+    document.body.appendChild(link);
+    link.click();
+    document.body.removeChild(link);
+  }
+};