Home button is difficult to see in dark Theme.

[mukaiyachidaiki]

Issue

• close #498

Overview (Required)

• When using a dark theme on Android9 or lower, set NavigationBar to a color with low transparency.

• Prepare LiveData in SystemUiManager in a form similar to the status bar, and change the color of the navigation bar according to the OS version when Context.isNightMode changes.

Screenshot

Before	After

[jmatsu-bot]

Your apk has been deployed to https://deploygate.com/distributions/5d3e15b266c4fe7a833fd38e4b961e63ddf73e09. Anyone can try your changes via the link.

Generated by :no_entry_sign: Danger

[jmatsu-bot]

No issue was reported. Cool!

Generated by :no_entry_sign: Danger