Hide the app contents while in the background

[swansontec]

See:

• https://developer.apple.com/library/archive/qa/qa1838/_index.html
• https://jonaskuiler.medium.com/creating-a-security-screen-on-ios-and-android-in-react-native-97703092e2de

For Android, the Medium solution is good, but there is a better one on the newest Android.

For iOS, the Apple solution is actually simpler than the Medium solution. Yes, I had to pay for for Medium to learn that. Drat.

CHANGELOG

Does this branch warrant an entry to the CHANGELOG?

• Yes
• No

Dependencies

none

Requirements

If you have made any visual changes to the GUI. Make sure you have:

• Tested on iOS device
• Tested on Android device
• Tested on small-screen device (iPod Touch)
• Tested on large-screen device (tablet)

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