fix: sorting never changes the queue

Removed the sortApplied→syncQueueToModel connection. Sorting the track
list only reorders the view; the queue is only set when a track is
actually played (double-click or Play Now), at which point the current
sorted order and clicked row are used.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/list/tracks.hpp

@@ -29,13 +29,11 @@ namespace List
         void playTrackRequested(qint64 trackId);
 
     private:
-        TrackListModel *m_model     = nullptr;
-        QobuzBackend   *m_backend   = nullptr;
-        PlayQueue      *m_queue     = nullptr;
-        qint64          m_playingId = 0;
+        TrackListModel *m_model   = nullptr;
+        QobuzBackend   *m_backend = nullptr;
+        PlayQueue      *m_queue   = nullptr;
 
         void onDoubleClicked(const QModelIndex &index);
         void onContextMenu(const QPoint &pos);
-        void syncQueueToModel();
     };
 }