feat: add CurrentPage coercion.

src/Ursa/Controls/Pagination/Pagination.cs

@@ -33,7 +33,7 @@ public class Pagination: TemplatedControl
     private NumericIntUpDown? _quickJumpInput;
 
     public static readonly StyledProperty<int?> CurrentPageProperty = AvaloniaProperty.Register<Pagination, int?>(
-        nameof(CurrentPage));
+        nameof(CurrentPage) , coerce: CoerceCurrentPage);
     
     public int? CurrentPage
     {
@@ -41,6 +41,16 @@ public class Pagination: TemplatedControl
         set => SetValue(CurrentPageProperty, value);
     }
     
+    private static int? CoerceCurrentPage(AvaloniaObject arg1, int? arg2)
+    {
+        if (arg2 is null) return null;
+        if (arg1 is Pagination p)
+        {
+            arg2 = MathHelpers.SafeClamp(arg2.Value, 1, p.PageCount + 1);
+        }
+        return arg2;
+    }
+
     private void OnCurrentPageChanged(AvaloniaPropertyChangedEventArgs<int?> args)
     {
         int? oldValue = args.GetOldValue<int?>();