Add About dialog and app metadata

MainWindow.xaml.cs

@@ -4,7 +4,6 @@ using System.Windows.Forms;
 using System.Windows.Media;
 using System.IO;
 using System.Windows.Input;
-using System.Reflection;
 using TaskbarLauncher.Models;
 using TaskbarLauncher.Services;
 using MessageBox = System.Windows.MessageBox;
@@ -35,7 +34,7 @@ public partial class MainWindow : Window
         DisplayModeBox.ItemsSource = Enum.GetValues<LauncherDisplayMode>();
         ItemDisplayModeBox.ItemsSource = Enum.GetValues<LauncherDisplayMode>();
         TypeBox.ItemsSource = Enum.GetValues<LauncherItemType>();
-        VersionText.Text = $"Version {GetAppVersion()}";
+        VersionText.Text = $"Version {AppInfo.Version}  Build {AppInfo.Build}";
         RefreshView();
     }
 
@@ -68,13 +67,6 @@ public partial class MainWindow : Window
         }
     }
 
-    private static string GetAppVersion()
-    {
-        return Assembly.GetExecutingAssembly()
-            .GetCustomAttribute<AssemblyInformationalVersionAttribute>()?
-            .InformationalVersion ?? "development";
-    }
-
     private static TreeViewItem CreateTreeItem(LauncherItem item)
     {
         var treeItem = new TreeViewItem { Header = $"{item.Title} ({item.Type})", Tag = item };
@@ -701,6 +693,16 @@ public partial class MainWindow : Window
         ConfigService.OpenConfigFolder();
     }
 
+    private void About_Click(object sender, RoutedEventArgs e)
+    {
+        AboutWindow aboutWindow = new()
+        {
+            Owner = this
+        };
+
+        aboutWindow.ShowDialog();
+    }
+
     private void Close_Click(object sender, RoutedEventArgs e)
     {
         Hide();