fix(queue): route scaffold masthead PLAY through queue; cache QueueItems snapshot

DeepDrftPublic.Client/Controls/ReleaseDetailScaffold.razor.cs

@@ -13,6 +13,7 @@ namespace DeepDrftPublic.Client.Controls;
 public partial class ReleaseDetailScaffold : ComponentBase
 {
     [CascadingParameter] public IStreamingPlayerService? PlayerService { get; set; }
+    [CascadingParameter] public IQueueService? Queue { get; set; }
 
     [Parameter] public required string Title { get; set; }
     [Parameter] public string? Artist { get; set; }
@@ -96,13 +97,19 @@ public partial class ReleaseDetailScaffold : ComponentBase
     {
         if (Track is null || PlayerService is null) return;
 
-        // Toggle if this track is already active (playing or paused); otherwise start a fresh
-        // stream. SelectTrackStreaming is the live entry point — the buffered path is dead.
+        // Toggle if this track is already active (playing or paused); otherwise PLAY it —
+        // prepend to the queue's front (deque PLAY semantics) so it becomes current and
+        // the existing queue stays intact behind it. Falls back to a direct stream when
+        // the queue cascade is absent (prerender / non-interactive).
         var isThisTrack = PlayerService.CurrentTrack?.Id == Track.Id;
         if (isThisTrack && (PlayerService.IsPlaying || PlayerService.IsPaused))
         {
             await PlayerService.TogglePlayPause();
         }
+        else if (Queue is not null)
+        {
+            await Queue.PlayTrack(Track);
+        }
         else
         {
             await PlayerService.SelectTrackStreaming(Track);