Add version number display to main window

NfcActions/MainWindow.xaml

@@ -19,11 +19,16 @@
 
         <!-- Header -->
         <Grid Grid.Row="0" Margin="0,0,0,15">
+            <StackPanel VerticalAlignment="Center" HorizontalAlignment="Left">
                 <TextBlock Text="NFC Actions Configuration"
                            FontSize="20"
-                       FontWeight="Bold"
-                       VerticalAlignment="Center"
-                       HorizontalAlignment="Left"/>
+                           FontWeight="Bold"/>
+                <TextBlock x:Name="VersionText"
+                           Text="v1.0.3"
+                           FontSize="10"
+                           Foreground="Gray"
+                           Margin="0,2,0,0"/>
+            </StackPanel>
             <Image Source="Resources/logo.png"
                    Height="60"
                    HorizontalAlignment="Right"

NfcActions/MainWindow.xaml.cs

@@ -19,6 +19,13 @@ public partial class MainWindow : Window
     {
         InitializeComponent();
         DataContext = viewModel;
+
+        // Set version number from assembly
+        var version = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version;
+        if (version != null)
+        {
+            VersionText.Text = $"v{version.Major}.{version.Minor}.{version.Build}";
+        }
     }
 
     private void Window_Closing(object? sender, CancelEventArgs e)