feat: rename to PinCode, add styles for size.

demo/Ursa.Demo/Pages/PinCodeDemo.axaml.cs

@@ -0,0 +1,18 @@
+using Avalonia.Controls;
+using Ursa.Controls;
+
+namespace Ursa.Demo.Pages;
+
+public partial class PinCodeDemo : UserControl
+{
+    public PinCodeDemo()
+    {
+        InitializeComponent();
+    }
+
+    private async void VerificationCode_OnComplete(object? _, PinCodeCompleteEventArgs e)
+    {
+        var text = string.Join(string.Empty, e.Code);
+        await MessageBox.ShowOverlayAsync(text);
+    }
+}