feat: add subdomain management, comprehensive QR code creation/redirection, and dashboard UI with white-label support.

src/app/(app)/dashboard/page.tsx

@@ -44,6 +44,7 @@ export default function DashboardPage() {
     uniqueScans: 0,
   });
   const [analyticsData, setAnalyticsData] = useState<any>(null);
+  const [userSubdomain, setUserSubdomain] = useState<string | null>(null);
 
   const mockQRCodes = [
     {
@@ -279,6 +280,13 @@ export default function DashboardPage() {
           const analytics = await analyticsResponse.json();
           setAnalyticsData(analytics);
         }
+
+        // Fetch user subdomain for white label display
+        const subdomainResponse = await fetch('/api/user/subdomain');
+        if (subdomainResponse.ok) {
+          const subdomainData = await subdomainResponse.json();
+          setUserSubdomain(subdomainData.subdomain || null);
+        }
       } catch (error) {
         console.error('Error fetching data:', error);
         setQrCodes([]);
@@ -449,10 +457,11 @@ export default function DashboardPage() {
           <div className="grid md:grid-cols-2 lg:grid-cols-3 gap-6">
             {qrCodes.map((qr) => (
               <QRCodeCard
-                key={qr.id}
+                key={`${qr.id}-${userSubdomain || 'default'}`}
                 qr={qr}
                 onEdit={handleEdit}
                 onDelete={handleDelete}
+                userSubdomain={userSubdomain}
               />
             ))}
           </div>