Tweak DataGrid classes etc based on tests with Aspire

src/Core/Components/DataGrid/FluentDataGrid.razor

@@ -33,7 +33,7 @@
                     headerType = DataGridRowType.StickyHeader;
                 }
                 <thead>
-                    <FluentDataGridRow RowType="@headerType" TGridItem="TGridItem" row-type="@headerType.ToAttributeValue()">
+                    <FluentDataGridRow RowType="@headerType" TGridItem="TGridItem" >
                         @_renderColumnHeaders
                     </FluentDataGridRow>
                 </thead>

src/Core/Components/DataGrid/FluentDataGrid.razor.css

@@ -5,6 +5,7 @@
     border-collapse: collapse;
     align-items: center;
     height: max-content;
+    margin-bottom: 0px;
 }
 
 thead,

src/Core/Components/DataGrid/FluentDataGridRow.razor

@@ -7,6 +7,7 @@
         style="@StyleValue"
         data-row-index=@RowIndex
         role="row"
+        row-type="@RowType.ToAttributeValue()"
         @onkeydown="@(e => HandleOnRowKeyDownAsync(RowId, e))"
         @onclick="@(e => HandleOnRowClickAsync(RowId))"
         @ondblclick="@(e => HandleOnRowDoubleClickAsync(RowId))"

src/Core/Components/DataGrid/FluentDataGridRow.razor.cs

@@ -63,7 +63,8 @@ public partial class FluentDataGridRow<TGridItem> : FluentComponentBase, IHandle
     /// </summary>
     protected FluentDataGrid<TGridItem> Grid => InternalGridContext.Grid;
 
-    protected string? ClassValue => new CssBuilder(Class)
+    protected string? ClassValue => new CssBuilder("fluent-data-grid-row")
+        .AddClass(Class)
         .AddClass("hover", when: Grid.ShowHover)
         .Build();