Add channel avatar to tvOS player controls

Matches the iOS controls by showing the channel avatar next to the
video title and channel name, reusing ChannelAvatarView and the
Yattee Server fallback.

Yattee/Views/Player/tvOS/TVPlayerControlsView.swift

@@ -117,7 +117,17 @@ struct TVPlayerControlsView: View {
     // MARK: - Top Bar
 
     private var topBar: some View {
-        HStack(alignment: .top) {
+        HStack(alignment: .center, spacing: 20) {
+            // Channel avatar
+            if let video = playerState?.currentVideo {
+                ChannelAvatarView(
+                    author: video.author,
+                    size: 110,
+                    yatteeServerURL: yatteeServerURL,
+                    source: video.id.source
+                )
+            }
+
             VStack(alignment: .leading, spacing: 8) {
                 // Video title
                 Text(playerState?.currentVideo?.title ?? "")
@@ -145,6 +155,10 @@ struct TVPlayerControlsView: View {
         }
     }
 
+    private var yatteeServerURL: URL? {
+        appEnvironment?.instancesManager.yatteeServerInstances.first { $0.isEnabled }?.url
+    }
+
     // MARK: - Action Buttons
 
     private var actionButtons: some View {