[chore:] implemented label generation button handler

MainWindow.axaml.cs

@@ -554,4 +554,15 @@ public partial class MainWindow : Window
 
         StartCombine(list, Convert.ToInt32(LstCustomers.SelectedItem.ToString().Split(" - ")[0]), "symdiff");
     }
+
+    private void BtnGenerateLabels_OnClick(object? sender, RoutedEventArgs e)
+    {
+        var builder = new PdfBuilder();
+
+        builder.CreateAddressLabelPdfFromAddressSetWithPlaceholder(
+            Convert.ToInt32(LstCustomerAdressSets.SelectedItems[0].ToString().Split(" - ")[0]),
+            "Company Logo/Info",
+            "output.pdf"
+        );
+    }
 }