refactor: update table resize support fix header (#2416)

* feat: 支持固定表头模式

* doc: 更新示例

Author: ArgoZhang

src/BootstrapBlazor.Server/Components/Samples/Table/TablesColumnResizing.razor

@@ -45,7 +45,7 @@
            Introduction="@Localizer["AllowResizingIntro"]"
            Name="AllowResizing">
     <section ignore class="mb-3">@((MarkupString)Localizer["AllowResizingDesc"].Value)</section>
-    <Table TItem="Foo"
+    <Table TItem="Foo" IsFixedHeader="true"
            IsPagination="true" PageItemsSource="@PageItemsSource"
            AllowResizing="true" ClientTableName="table-test"
            IsStriped="true" IsBordered="true" RenderMode="TableRenderMode.Table"

src/BootstrapBlazor/Components/Table/Table.razor.cs

@@ -832,9 +832,16 @@ protected override async Task OnAfterRenderAsync(bool firstRender)
 
     private int? _localStorageTableWidth;
 
-    private string? GetTableStyleString(bool hasHeader) => hasHeader && _localStorageTableWidth.HasValue
-        ? $"width: {_localStorageTableWidth.Value}px;"
-        : null;
+    private string? GetTableStyleString(bool hasHeader)
+    {
+        string? ret = null;
+        if (_localStorageTableWidth.HasValue)
+        {
+            var width = hasHeader ? _localStorageTableWidth.Value : _localStorageTableWidth.Value - 6;
+            ret = $"width: {width}px;";
+        }
+        return ret;
+    }
 
     private string? GetTableName(bool hasHeader) => hasHeader ? ClientTableName : null;