fix(theme): green hero Share/Play/Queue glyphs in dark via shared .dd-accent-icon

Fold Session/Mix hero glyphs into the reusable accent-icon treatment so they reach
the glyph (beating .mud-secondary-text) green-accent in both themes; drop the dead
wrapper white rule and the redundant dark-only hero override. Light pixel-identical.

DeepDrftPublic.Client/Pages/CutDetail.razor

@@ -83,7 +83,7 @@ else
                         </div>
                     }
 
-                    <div class="cut-detail-actions">
+                    <div class="cut-detail-actions dd-accent-icon dd-accent-fill">
                         @* Header Play loads the full album into the queue at index 0 (§3.4 seam,
                            closed P11 W1). Disabled until at least one streamable track is resolved. *@
                         <MudButton Variant="Variant.Filled"
@@ -133,7 +133,7 @@ else
                     {
                         var track = ViewModel.Tracks[i];
                         var index = i;
-                        <div class="cut-detail-track-row">
+                        <div class="cut-detail-track-row dd-accent-icon">
                             <span class="cut-detail-track-number">@track.TrackNumber</span>
                             <div class="cut-detail-track-play">
                                 <PlayStateIcon Track="@track"