Android status bar themeing issues

[timbl-ont]

There are two issues with respect to theming the status bar as part of a themed wallet header:

1. partially hardcoded and not overridable

In Bifold core app.tsx:

...
<StatusBar
      hidden={false}
      barStyle="light-content"
      backgroundColor={bifoldTheme.ColorPalette.brand.primary}
      translucent={false}
/>
...

The backgroundColor follows the brand theming (Android only), but the barStyle is fixed. The barStyle changes the font colour (white or black). All these values should be overridable via the NavigationTheme.

2. On Android, backgroundColor is deprecated (among other options) on API 35. https://reactnative.dev/docs/statusbar#backgroundcolor-android