Add top padding to playback speed controls

Improve spacing in PlaybackSettings view by adding top padding to the
playback speed section for better visual separation.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Shared/Player/PlaybackSettings.swift

@@ -54,6 +54,7 @@ struct PlaybackSettings: View {
                     Spacer()
                         .frame(maxWidth: 50, alignment: .trailing)
                 }
+                .padding(.top, 10)
 
                 HStack {
                     controlsHeader("Playback Mode".localized())