Merge nowplaying-card-reactivity into dev (NowPlaying card now re-renders on track change)

DeepDrftPublic.Client/Controls/NowPlayingCard.razor

@@ -1,4 +1,5 @@
 @using DeepDrftPublic.Client.Services
+@implements IDisposable
 <div class="now-playing">
     <div class="np-label"><span class="np-dot"></span>Now Playing</div>
     <div class="np-title">@(Player?.CurrentTrack?.TrackName ?? "Nothing playing")</div>
@@ -12,4 +13,29 @@
 
 @code {
     [CascadingParameter] public IStreamingPlayerService? Player { get; set; }
-}
+
+    private IStreamingPlayerService? _subscribedPlayer;
+
+    protected override void OnParametersSet()
+    {
+        if (Player != null && !ReferenceEquals(Player, _subscribedPlayer))
+        {
+            if (_subscribedPlayer != null)
+                _subscribedPlayer.StateChanged -= OnPlayerStateChanged;
+
+            Player.StateChanged += OnPlayerStateChanged;
+            _subscribedPlayer = Player;
+        }
+    }
+
+    private void OnPlayerStateChanged() => InvokeAsync(StateHasChanged);
+
+    public void Dispose()
+    {
+        if (_subscribedPlayer != null)
+        {
+            _subscribedPlayer.StateChanged -= OnPlayerStateChanged;
+            _subscribedPlayer = null;
+        }
+    }
+}