feat(mix): lava-lamp popover with RadialKnob controls + wider Mix detail body (P10 W4)

DeepDrftPublic.Client/Controls/ReleaseDetailScaffold.razor.cs

@@ -31,6 +31,13 @@ public partial class ReleaseDetailScaffold : ComponentBase
     /// </summary>
     [Parameter] public RenderFragment? TopContent { get; set; }
 
+    /// <summary>
+    /// Optional action rendered at the top-right of the container, on the same SpaceBetween row as the
+    /// back link (back link left, action right). The Mix detail page uses it for the lava-lamp
+    /// visualizer-settings button; other media leave it null and render the back link alone.
+    /// </summary>
+    [Parameter] public RenderFragment? TopRightAction { get; set; }
+
     /// <summary>Medium-specific hero visual (cover art, hero image, or waveform background).</summary>
     [Parameter] public RenderFragment? Hero { get; set; }