Improve video layer rendering on macOS

Refactored glUpdate to use requestRedraw method for better control. Added needsRedraw flag to prevent redundant display calls. Enabled asynchronous drawing on VideoLayer for improved performance. Modified displayLinkCallback to only report swap without triggering display to avoid flooding the main thread.

Model/Player/Backends/MPVClient.swift

@@ -666,11 +666,8 @@ final class MPVClient: ObservableObject {
     func glUpdate(_ ctx: UnsafeMutableRawPointer?) {
         let videoLayer = unsafeBitCast(ctx, to: VideoLayer.self)
 
-        videoLayer.client?.queue?.async {
-            if !videoLayer.isAsynchronous {
-                videoLayer.display()
-            }
-        }
+        // Request a redraw when MPV signals that new content is available
+        videoLayer.requestRedraw()
     }
 #else
     func getProcAddress(_: UnsafeMutableRawPointer?, _ name: UnsafePointer<Int8>?) -> UnsafeMutableRawPointer? {