refactor: migrate project to .net core 8 to resolve the issue that we can not use CommunityToolkit.Mvvm

BallanceTasEditor/ViewModels/NewFileDialog.cs

@@ -7,17 +7,17 @@ using System.Threading.Tasks;
 
 namespace BallanceTasEditor.ViewModels {
     public partial class NewFileDialog : ObservableObject {
-        [ObservableProperty]
-        private int count;
-
-        [ObservableProperty]
-        private int fps;
-
         public NewFileDialog() {
             Count = 10000;
             // 132 or 264
             Fps = 264;
         }
 
+        [ObservableProperty]
+        private int count;
+
+        [ObservableProperty]
+        private int fps;
+
     }
 }