Add audio buffer for WSLg stability

Increase mpv audio buffer to 2 seconds to fix stuttering on WSLg.

Ref: https://github.com/microsoft/wslg/issues/1257

src/player/mod.rs

@@ -35,6 +35,7 @@ impl Player {
             .arg("--no-terminal")
             .arg("--profile=fast")
             .arg("--audio-display=no")  // Don't show cover art for audio files
+            .arg("--audio-buffer=2")  // Larger buffer for WSLg audio stability
             .arg(format!("--input-ipc-server={}", socket_path.display()))
             .stdin(Stdio::null())
             .stdout(Stdio::null())