Now shows how many CChars left in the list

LearningChineseFixed/Client/Program.cs

@@ -9,6 +9,9 @@ namespace LearningChineseFixed
 {
     public class Program
     {
+        public static int CCharsLeft = 0;
+        public static Action UpdateUiEvent;
+
         public static async Task Main(string[] args)
         {
             var builder = WebAssemblyHostBuilder.CreateDefault(args);
@@ -27,5 +30,7 @@ namespace LearningChineseFixed
 
             await builder.Build().RunAsync();
         }
+
+        public static void InvokeUiUpdate() => UpdateUiEvent?.Invoke();
     }
 }