Spotify Web 1.60 - Fullscreen Mode toggle in Settings

Adds a Fullscreen Mode toggle to Settings, between Cigi Translator and Keep Screen On. It is enabled by default.

When it is on, the status bar is hidden and the system bars are transparent. On Android 9+ the app also draws into the notch or camera cutout along the top.

When it is off, you get a normal window where Android keeps space for the status bar, shown as a black bar. The switch applies to both the main screen and Settings, so their headers line up in either mode.

It takes effect the moment you flip it, with no app refresh required.

Limits: on Android 8 and older there is no notch handling, since those versions don't support it. Only the status bar is hidden or shown.