feature: Embed Frame Player

DeepDrftPublic.Client/Services/IPlayerService.cs

@@ -62,4 +62,13 @@ public interface IStreamingPlayerService : IPlayerService
     
     // Streaming control methods
     Task SelectTrackStreaming(TrackDto track);
+
+    /// <summary>
+    /// Stages a track as the current track without touching the audio context or starting the
+    /// stream. Used by the embed player, where there is no user gesture on initial load: the track
+    /// is shown as ready, and the first play click (a genuine gesture) calls
+    /// <see cref="SelectTrackStreaming"/> so the browser allows the AudioContext to start. Sets
+    /// <see cref="IPlayerService.CurrentTrack"/> and notifies; performs no JS interop.
+    /// </summary>
+    Task StageTrack(TrackDto track);
 }