Merge mix-play-track-selection-fix into dev (forward releaseId through TrackProxyController so WASM-path mix/session Play resolves the release's own track)

DeepDrftPublic/Controllers/TrackProxyController.cs

@@ -32,6 +32,7 @@ public class TrackProxyController : ControllerBase
         [FromQuery] string? q = null,
         [FromQuery] string? album = null,
         [FromQuery] string? genre = null,
+        [FromQuery] long? releaseId = null,
         CancellationToken ct = default)
     {
         var query = $"api/track/page?page={page}&pageSize={pageSize}&sortDescending={sortDescending}";
@@ -43,6 +44,8 @@ public class TrackProxyController : ControllerBase
             query += $"&album={Uri.EscapeDataString(album)}";
         if (!string.IsNullOrWhiteSpace(genre))
             query += $"&genre={Uri.EscapeDataString(genre)}";
+        if (releaseId is { } rid)
+            query += $"&releaseId={rid}";
 
         HttpResponseMessage upstream;
         try