feat: Implement Novu username and update functionality

src/components/settings/NotificationsTab.tsx

@@ -111,6 +111,14 @@ export function NotificationsTab() {
 
       if (result.success) {
         toast.success("Notification preferences saved successfully");
+        
+        // Also update Novu subscriber profile to sync channel preferences
+        if (notificationService.isEnabled()) {
+          await notificationService.updateSubscriber({
+            subscriberId: user.id,
+            email: user.email,
+          });
+        }
       } else {
         throw new Error(result.error || 'Failed to save preferences');
       }