fix: enable player controls on load, clear track selection on stop and end-of-track

Add StateChanged multicast event to IPlayerService so AudioPlayerBar and TracksView
re-render themselves without relying on the IsFixed cascade re-render path. Clear
_selectedTrack in TracksView when IsLoaded drops (stop, unload, end-of-track). Set
IsLoaded=false in OnPlaybackEndCallback so end-of-track triggers the same clear path.
Add JS-module readiness probe in AudioInteropService; delete dead TS and buffered C#
path; consolidate GetPlayIcon/FormatTime helpers; fix misleading minimize dock icon.

DeepDrftPublic.Client/Pages/TracksView.razor.cs

@@ -6,21 +6,51 @@ using Models.Common;
 
 namespace DeepDrftPublic.Client.Pages;
 
-public partial class TracksView : ComponentBase
+public partial class TracksView : ComponentBase, IDisposable
 {
     [Inject] public required TracksViewModel ViewModel { get; set; }
     [CascadingParameter] public required IStreamingPlayerService PlayerService { get; set; }
-    
+
     private TrackDto? _selectedTrack = null;
     private int _clickCount = 0;
     private string _lifecycleStatus = "Not initialized";
-    
+    private IStreamingPlayerService? _subscribedService;
+
     protected override async Task OnInitializedAsync()
     {
         _lifecycleStatus = "OnInitializedAsync called";
         await SetPage(1);
     }
 
+    protected override void OnParametersSet()
+    {
+        // The Stop/Close buttons on the player bar reset the player directly,
+        // bypassing PlayTrack — so the gallery's selection must follow player
+        // state rather than only its own clicks. Subscribe to the multicast
+        // side-channel (the cascade is IsFixed, so provider re-renders don't
+        // reach us) and clear the highlight when nothing is loaded.
+        if (PlayerService != null && !ReferenceEquals(PlayerService, _subscribedService))
+        {
+            if (_subscribedService != null)
+                _subscribedService.StateChanged -= OnPlayerStateChanged;
+
+            PlayerService.StateChanged += OnPlayerStateChanged;
+            _subscribedService = PlayerService;
+        }
+    }
+
+    private void OnPlayerStateChanged()
+    {
+        // Sync the gallery selection to the player. When the player is no longer
+        // loaded (stopped/closed/ended) drop the highlight; guard against a
+        // redundant re-render when nothing actually changed.
+        if (!PlayerService.IsLoaded && _selectedTrack != null)
+        {
+            _selectedTrack = null;
+            InvokeAsync(StateHasChanged);
+        }
+    }
+
     protected override async Task OnAfterRenderAsync(bool firstRender)
     {
         if (firstRender)
@@ -62,4 +92,13 @@ public partial class TracksView : ComponentBase
         
         _selectedTrack = track;
     }
+
+    public void Dispose()
+    {
+        if (_subscribedService != null)
+        {
+            _subscribedService.StateChanged -= OnPlayerStateChanged;
+            _subscribedService = null;
+        }
+    }
 }