Merge dev into p10-w4-popover-knobs (integrate concurrent Phase 11 scaffold changes)

# Conflicts:
#	DeepDrftPublic.Client/Controls/ReleaseDetailScaffold.razor.cs

DeepDrftPublic.Client/Controls/ReleaseDetailScaffold.razor.cs

@@ -38,9 +38,24 @@ public partial class ReleaseDetailScaffold : ComponentBase
     /// </summary>
     [Parameter] public RenderFragment? TopRightAction { get; set; }
 
+    /// <summary>
+    /// Optional replacement for the header region (masthead + play affordance). When null, the
+    /// scaffold renders its default masthead+play row wired to <see cref="PlayTrack"/>. A composer
+    /// that needs a different header arrangement (e.g. the Cut album's left-meta / right-cover split
+    /// with its own Play/Share buttons) supplies this — layout variance rides the slot, never a
+    /// boolean flag (Phase 9 §5.3).
+    /// </summary>
+    [Parameter] public RenderFragment? Header { get; set; }
+
     /// <summary>Medium-specific hero visual (cover art, hero image, or waveform background).</summary>
     [Parameter] public RenderFragment? Hero { get; set; }
 
+    /// <summary>
+    /// Optional body region rendered below the meta block — the Cut album's multi-track listing.
+    /// Single-track media leave it null.
+    /// </summary>
+    [Parameter] public RenderFragment? BodyContent { get; set; }
+
     /// <summary>Optional medium-specific metadata block, rendered under a divider when present.</summary>
     [Parameter] public RenderFragment? MetaContent { get; set; }
 
@@ -51,6 +66,13 @@ public partial class ReleaseDetailScaffold : ComponentBase
     /// </summary>
     [Parameter] public bool ShowMeta { get; set; } = true;
 
+    /// <summary>
+    /// Gate for the default track-keyed share row at the foot of the scaffold. A composer that owns
+    /// its own share affordance (the Cut header carries Play + Share inline) sets this false to
+    /// suppress the duplicate. Defaults to shown.
+    /// </summary>
+    [Parameter] public bool ShowShareRow { get; set; } = true;
+
     private async Task PlayTrack()
     {
         if (Track is null || PlayerService is null) return;