feat: extract CommunityToolkit version.

(cherry picked from commit 580e780e58)

demo/Semi.Avalonia.TreeDataGrid.Demo/Program.cs

@@ -1,5 +1,6 @@
 using Avalonia;
 using System;
+using Avalonia.Media;
 
 namespace Semi.Avalonia.TreeDataGrid.Demo;
 
@@ -10,12 +11,21 @@ class Program
     // yet and stuff might break.
     [STAThread]
     public static void Main(string[] args) => BuildAvaloniaApp()
+        .With(new FontManagerOptions
+        {
+            FontFallbacks =
+            [
+                new FontFallback
+                {
+                    FontFamily = new FontFamily("Microsoft YaHei")
+                }
+            ]
+        })
         .StartWithClassicDesktopLifetime(args);
 
     // Avalonia configuration, don't remove; also used by visual designer.
     public static AppBuilder BuildAvaloniaApp()
         => AppBuilder.Configure<App>()
             .UsePlatformDetect()
-            .WithInterFont()
             .LogToTrace();
 }