Fix admin email to display correct payment amount

- Admin notification was showing 6 instead of 600
- Root cause: double cents-to-dollars conversion
- webhooks.js already converts to dollars before calling sendAdminNotification
- Updated sendAdminNotification to handle pre-converted dollar amounts
- Simplified formatting logic for clarity

server/utils/emailService.js:155-162

server/utils/emailService.js

@@ -151,7 +151,14 @@ export async function sendContactEmail(contactData) {
 
 // Send admin notification for new order
 export async function sendAdminNotification(orderDetails, customerEmail) {
-  const subject = `New Order: ${orderDetails.tons} tons CO₂ - $${(orderDetails.totalAmount / 100).toFixed(2)}`;
+  // totalAmount is already in dollars (converted before calling this function)
+  const totalAmount = typeof orderDetails.totalAmount === 'string'
+    ? orderDetails.totalAmount
+    : (orderDetails.totalAmount / 100).toFixed(2);
+
+  // Format amount with commas for subject line
+  const formattedAmount = parseFloat(totalAmount).toFixed(2).replace(/\B(?=(\d{3})+(?!\d))/g, ',');
+  const subject = `New Order: ${orderDetails.tons} tons CO₂ - $${formattedAmount}`;
   const adminEmail = process.env.ADMIN_EMAIL || 'matt@puffinoffset.com';
 
   // Check if admin notifications are enabled
@@ -167,7 +174,7 @@ export async function sendAdminNotification(orderDetails, customerEmail) {
     {
       tons: orderDetails.tons,
       portfolioId: orderDetails.portfolioId,
-      totalAmount: (orderDetails.totalAmount / 100).toFixed(2),
+      totalAmount: totalAmount,
       orderId: orderDetails.orderId,
       customerEmail,
       timestamp: new Date().toLocaleString('en-US', {