fix: fix IPV4Box key handling in DataGrid. Add a SampleBox project for extra testing. Upgrade to released version.

demo/Sandbox/Views/MainWindow.axaml.cs

@@ -0,0 +1,11 @@
+using Avalonia.Controls;
+
+namespace Sandbox.Views;
+
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+}