Commit design approval workflow and related features

- Add design approval workflow components and API routes
- Update checkout process for design approval integration
- Add admin navigation for design management
- Update mail utilities for design notifications
- Update types for design approval system
- Update Prisma schema for design approval database

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/lib/mail.ts

@@ -173,3 +173,70 @@ export async function sendCustomerBroadcast({ to, name, subject, message, attach
     return { sent: false as const, reason: err instanceof Error ? err.message : 'Unknown error sending email' };
   }
 }
+
+type SendDesignSubmissionNotificationArgs = {
+  customerName: string | null;
+  productName: string;
+  adminLink: string;
+};
+
+export async function sendDesignSubmissionNotification({
+  customerName,
+  productName,
+  adminLink,
+}: SendDesignSubmissionNotificationArgs) {
+  const to = process.env.ADMIN_NOTIFY_EMAIL ?? process.env.SMTP_USER;
+  if (!process.env.SMTP_HOST || !to) {
+    return { sent: false, reason: 'SMTP not configured — set SMTP_HOST etc. in .env' as const };
+  }
+
+  const transporter = getTransporter();
+
+  try {
+    await transporter.sendMail({
+      from: process.env.MAIL_FROM ?? process.env.SMTP_USER,
+      to,
+      subject: `New design submitted for approval${customerName ? ` from ${customerName}` : ''}`,
+      text: `A new ${productName} design has been submitted for your review and approval.\n\nReview it here:\n${adminLink}`,
+      html: `<p>A new ${productName} design has been submitted for your review and approval.</p><p><a href="${adminLink}">${adminLink}</a></p>`,
+    });
+    return { sent: true as const };
+  } catch (err) {
+    return { sent: false as const, reason: err instanceof Error ? err.message : 'Unknown error sending email' };
+  }
+}
+
+type SendDesignApprovedEmailArgs = {
+  to: string;
+  customerName: string | null;
+  productName: string;
+  checkoutLink: string;
+};
+
+export async function sendDesignApprovedEmail({
+  to,
+  customerName,
+  productName,
+  checkoutLink,
+}: SendDesignApprovedEmailArgs) {
+  if (!process.env.SMTP_HOST) {
+    return { sent: false, reason: 'SMTP not configured — set SMTP_HOST etc. in .env' as const };
+  }
+
+  const transporter = getTransporter();
+
+  const greeting = customerName ? `Hi ${customerName},` : 'Hi,';
+
+  try {
+    await transporter.sendMail({
+      from: process.env.MAIL_FROM ?? process.env.SMTP_USER,
+      to,
+      subject: `Your ${productName} design has been approved!`,
+      text: `${greeting}\n\nYour ${productName} design has been approved! You can now add it to your cart and proceed to checkout.\n\n${checkoutLink}\n\n— Craft2Prints`,
+      html: `<p>${greeting}</p><p>Your ${productName} design has been approved! You can now add it to your cart and proceed to checkout.</p><p><a href="${checkoutLink}">${checkoutLink}</a></p><p>— Craft2Prints</p>`,
+    });
+    return { sent: true as const };
+  } catch (err) {
+    return { sent: false as const, reason: err instanceof Error ? err.message : 'Unknown error sending email' };
+  }
+}

src/lib/types.ts

@@ -73,6 +73,8 @@ export type CartItem = {
   designPreviewUrlBack: string | null;
   placementPreviewUrl: string | null;
   placementPreviewUrlBack: string | null;
+  designWidthCm: number | null;
+  designHeightCm: number | null;
 };
 
 export type ProofDTO = {