Feature: Add unread message notifications to admin badge

- Add isRead boolean field to Message model (default: false)
- Create migration to update database schema
- Update admin notifications to count unread messages
- Display unread message count in notification badge tooltip
- Admins now see all notifications: pending orders, design approvals, photo requests, unread messages
- Color-coded tooltip: orange (orders), blue (designs), clay (photos), pink (messages)

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

src/components/AdminNotifications.tsx

@@ -13,6 +13,7 @@ export default async function AdminNotifications() {
       pendingOrders,
       designApprovalsInReview,
       photoRequests,
+      unreadMessages,
     ] = await Promise.all([
       prisma.order.count({
         where: {
@@ -26,9 +27,12 @@ export default async function AdminNotifications() {
       prisma.customRequest.count({
         where: { status: 'PENDING' },
       }),
+      prisma.message.count({
+        where: { isRead: false },
+      }),
     ]);
 
-    const totalNotifications = pendingOrders + designApprovalsInReview + photoRequests;
+    const totalNotifications = pendingOrders + designApprovalsInReview + photoRequests + unreadMessages;
 
     return (
       <AdminNotificationsBadge
@@ -36,10 +40,11 @@ export default async function AdminNotifications() {
         pendingOrders={pendingOrders}
         designApprovals={designApprovalsInReview}
         photoRequests={photoRequests}
+        unreadMessages={unreadMessages}
       />
     );
   } catch (err) {
     console.error('Error fetching admin notifications:', err);
-    return <AdminNotificationsBadge total={0} pendingOrders={0} designApprovals={0} photoRequests={0} />;
+    return <AdminNotificationsBadge total={0} pendingOrders={0} designApprovals={0} photoRequests={0} unreadMessages={0} />;
   }
 }