- spacing: top padding + inter-group gaps so section titles, descriptions
and buttons no longer touch (playback buffer, audio/subtitles, music,
marlin, kefin, streamystats, storage, hide-libraries)
- ListGroup: skip empty section titles
- SettingSwitch: cap the native Android switch in a fixed centered box so
toggle rows match the other rows and stay put when toggled; iOS unchanged
- Appearance: move "Hide libraries" to the end of the list
