Rebuild shell omnibox as command palette

src/RolemasterDb.App/Components/Primitives/SurfaceDrawer.razor

@@ -2,7 +2,7 @@
 {
     <button
         type="button"
-        class="@BuildBackdropCssClass()"
+        class="surface-drawer-backdrop"
         aria-label="@CloseLabel"
         @onclick="HandleCloseAsync"></button>
 
@@ -61,9 +61,6 @@
     [Parameter]
     public string? CssClass { get; set; }
 
-    [Parameter]
-    public string? BackdropCssClass { get; set; }
-
     private string BuildCssClass()
     {
         var classes = new List<string> { "surface-drawer", $"is-{Placement.Trim().ToLowerInvariant()}" };
@@ -75,17 +72,6 @@
         return string.Join(' ', classes);
     }
 
-    private string BuildBackdropCssClass()
-    {
-        var classes = new List<string> { "surface-drawer-backdrop" };
-        if (!string.IsNullOrWhiteSpace(BackdropCssClass))
-        {
-            classes.Add(BackdropCssClass);
-        }
-
-        return string.Join(' ', classes);
-    }
-
     private Task HandleCloseAsync() =>
         OnClose.InvokeAsync();
 }