feat(emails): implement transactional email system with Resend

- Add Resend email integration with @react-email/render
- Create email templates: OrderConfirmation, OrderShipped, OrderCancelled, OrderPaid
- Implement webhook handler for ORDER_CREATED and other events
- Add multi-language support for customer emails
- Admin emails in English with order details
- Update checkout page with auto-scroll on order completion
- Configure DASHBOARD_URL environment variable

src/lib/resend.ts

@@ -1,4 +1,5 @@
 import { Resend } from "resend";
+import { render } from "@react-email/render";
 
 let resendClient: Resend | null = null;
 
@@ -30,17 +31,22 @@ export async function sendEmail({
   idempotencyKey?: string;
 }) {
   const resend = getResendClient();
-  const { data, error } = await resend.emails.send(
-    {
-      from: "ManoonOils <support@manoonoils.com>",
-      to: Array.isArray(to) ? to : [to],
-      subject,
-      react,
-      text,
-      tags,
-      ...(idempotencyKey && { idempotencyKey }),
-    }
-  );
+  
+  // Render React component to HTML
+  const html = await render(react, {
+    pretty: true,
+  });
+  
+  const { data, error } = await resend.emails.send({
+    from: "ManoonOils <support@mail.manoonoils.com>",
+    replyTo: "support@manoonoils.com",
+    to: Array.isArray(to) ? to : [to],
+    subject,
+    html,
+    text,
+    tags,
+    ...(idempotencyKey && { idempotencyKey }),
+  });
 
   if (error) {
     console.error("Failed to send email:", error);

src/lib/saleor/mutations/Checkout.ts

@@ -152,3 +152,24 @@ export const CHECKOUT_EMAIL_UPDATE = gql`
   }
   ${CHECKOUT_FRAGMENT}
 `;
+
+export const CHECKOUT_METADATA_UPDATE = gql`
+  mutation CheckoutMetadataUpdate($checkoutId: ID!, $metadata: [MetadataInput!]!) {
+    updateMetadata(id: $checkoutId, input: $metadata) {
+      item {
+        ... on Checkout {
+          id
+          metadata {
+            key
+            value
+          }
+        }
+      }
+      errors {
+        field
+        message
+        code
+      }
+    }
+  }
+`;