fix: Properly update WebView history properties

src/Uno.UI/UI/Xaml/Controls/WebView/Core/CoreWebView2.cs

@@ -163,6 +163,12 @@ internal void RaiseNavigationCompleted(Uri? uri, bool isSuccess, int httpStatusC
 
 	internal void RaiseHistoryChanged() => HistoryChanged?.Invoke(this, null);
 
+	internal void SetHistoryProperties(bool canGoBack, bool canGoForward)
+	{
+		CanGoBack = canGoBack;
+		CanGoForward = canGoForward;
+	}
+
 	internal void RaiseWebMessageReceived(string message) => WebMessageReceived?.Invoke(this, new(message));
 
 	internal void RaiseUnsupportedUriSchemeIdentified(Uri targetUri, out bool handled)
@@ -173,13 +179,6 @@ internal void RaiseUnsupportedUriSchemeIdentified(Uri targetUri, out bool handle
 		handled = args.Handled;
 	}
 
-	internal void SetHistoryProperties(bool canGoBack, bool canGoForward)
-	{
-		CanGoBack = canGoBack;
-		CanGoForward = canGoForward;
-		RaiseHistoryChanged();
-	}
-
 	internal static bool GetIsHistoryEntryValid(string url) =>
 		!url.IsNullOrWhiteSpace() &&
 		!url.Equals(BlankUrl, StringComparison.OrdinalIgnoreCase);

src/Uno.UI/UI/Xaml/Controls/WebView/Native/Android/InternalWebClient.Android.cs

@@ -62,6 +62,7 @@ public override void OnPageFinished(Android.Webkit.WebView view, string url)
 	{
 		_coreWebView.DocumentTitle = view.Title;
 
+		_nativeWebViewWrapper.RefreshHistoryProperties();
 		_coreWebView.RaiseHistoryChanged();
 
 		var uri = !_nativeWebViewWrapper._wasLoadedFromString && !string.IsNullOrEmpty(url) ? new Uri(url) : null;

src/Uno.UI/UI/Xaml/Controls/WebView/Native/Android/NativeWebViewWrapper.Android.cs

@@ -191,7 +191,7 @@ async Task<string> INativeWebView.InvokeScriptAsync(string script, string[] argu
 	// Because Android doesn't let you modify the navigation history, 
 	// we need CanGoBack, CanGoForward, GoBack and GoForward to take the above condition into consideration.
 
-	internal void OnNavigationHistoryChanged()
+	internal void RefreshHistoryProperties()
 	{
 		// A non-zero number of steps to the nearest valid history entry means that navigation in the given direction is allowed
 		var canGoBack = GetStepsToNearestValidHistoryEntry(direction: -1 /* backward */) != 0;

src/Uno.UI/UI/Xaml/Controls/WebView/Native/iOSmacOS/UnoWKWebView.iOSmacOS.cs

@@ -423,6 +423,7 @@ private void RaiseNavigationStarting(object navigationData, out bool cancel)
 	private void RaiseNavigationCompleted(Uri uri, bool isSuccess, int httpStatusCode, CoreWebView2WebErrorStatus errorStatus)
 	{
 		_coreWebView.SetHistoryProperties(CanGoBack, CanGoForward);
+		_coreWebView.RaiseHistoryChanged();
 		_coreWebView.RaiseNavigationCompleted(uri, isSuccess, httpStatusCode, errorStatus);
 	}