feat: set FontWeight to Normal for navigation button in MainView

demo/Semi.Avalonia.Demo/Pages/PaletteDemo.axaml.cs

@@ -12,14 +12,16 @@ public partial class PaletteDemo : UserControl
     public PaletteDemo()
     {
         InitializeComponent();
-        this.DataContext = new PaletteDemoViewModel();
+        this.DataContext = PaletteDemoViewModel.Instance.Value;
     }
 
     protected override async void OnApplyTemplate(TemplateAppliedEventArgs e)
     {
         base.OnApplyTemplate(e);
-        PaletteDemoViewModel? vm = this.DataContext as PaletteDemoViewModel;
-        await Dispatcher.UIThread.InvokeAsync(() => { vm?.InitializeResources(); });
+        if (this.DataContext is PaletteDemoViewModel vm && !vm.IsInitialized)
+        {
+            await Dispatcher.UIThread.InvokeAsync(() => { vm?.InitializeResources(); });
+        }
     }
 
     public async Task Copy(object? o)

demo/Semi.Avalonia.Demo/ViewModels/PaletteDemoViewModel.cs

@@ -14,6 +14,8 @@ namespace Semi.Avalonia.Demo.ViewModels;
 
 public partial class PaletteDemoViewModel : ObservableObject
 {
+    public static Lazy<PaletteDemoViewModel> Instance { get; } = new(() => new PaletteDemoViewModel());
+    public bool IsInitialized { get; private set; }
     private readonly string[] _predefinedColorNames =
     [
         "Red", "Pink", "Purple", "Violet", "Indigo",
@@ -44,6 +46,7 @@ public partial class PaletteDemoViewModel : ObservableObject
         InitializePalette();
         InitializeFunctionalColors();
         InitializeShadows();
+        IsInitialized = true;
     }
 
     private void InitializePalette()

demo/Semi.Avalonia.Demo/Views/MainView.axaml

@@ -83,6 +83,7 @@
                                                 <Border Classes="NavItemHost" Classes.Selected="{Binding IsSelected}">
                                                     <Button
                                                         Classes="NavItem"
+                                                        FontWeight="Normal"
                                                         Classes.Selected="{Binding IsSelected}"
                                                         Command="{Binding NavigateCommand}"
                                                         CommandParameter="{Binding}"