feat: Client 工程默认增加固定标签页功能

src/blazor/client/BootstrapClient.Shared/Shared/MainLayout.razor

@@ -4,7 +4,7 @@
         IsFullSide="@IsFullSide" IsFixedHeader="@IsFixedHeader" IsFixedFooter="@IsFixedFooter" ShowFooter="@ShowFooter"
         Menus="@MenuItems" UseTabSet="@UseTabSet"
         TabDefaultUrl="/Home/Index"
-        AdditionalAssemblies="new[] { GetType().Assembly }" OnAuthorizing="@OnAuthorizing" class="@Theme is-fixed-tab">
+        AdditionalAssemblies="new[] { GetType().Assembly }" OnAuthorizing="@OnAuthorizing" class="@ClassString">
     <Header>
         <span class="ml-3 flex-sm-fill d-none d-sm-block">Bootstrap of Blazor</span>
         <Widget></Widget>

src/blazor/client/BootstrapClient.Shared/Shared/MainLayout.razor.cs

@@ -43,6 +43,10 @@ public sealed partial class MainLayout
 
     private string? Footer { get; set; }
 
+    private string? ClassString => CssBuilder.Default(Theme)
+        .AddClass("is-fixed-tab")
+        .Build();
+
     [Inject]
     [NotNull]
     private IBootstrapAdminService? SecurityService { get; set; }