Throw Error Box instead of crashing

App.xaml.cs

@@ -9,6 +9,33 @@ namespace AnilistListConverter;
 /// </summary>
 public partial class App : Application
 {
+    protected override void OnStartup(StartupEventArgs e)
+    {
+        base.OnStartup(e);
 
+        // Add a global exception handler
+        AppDomain.CurrentDomain.UnhandledException += (sender, args) =>
+        {
+            Exception ex = (Exception)args.ExceptionObject;
+            ShowErrorAndShutdown(ex);
+        };
+
+        // Also catch UI thread exceptions
+        DispatcherUnhandledException += (sender, args) =>
+        {
+            Exception ex = args.Exception;
+            args.Handled = true;
+            ShowErrorAndShutdown(ex);
+        };
+    }
+
+    private void ShowErrorAndShutdown(Exception ex)
+    {
+        // Display the error in a message box
+        MessageBox.Show($"An unexpected error occurred: {ex.Message}", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
+
+        // Close the app after the user clicks OK
+        Environment.Exit(1);
+    }
 }