Implement fully translucent Android status bar

[Julesssss]

Problem

This related Android PR fixes the dark mode status bar issue by hardcoding the status bar colour. This obviously won't work once we allow uses to switch themes, so this needs to be improved with a translucent status colour.

Solution

Simply use a translucent status bar (with the understanding that this might not work on older Android versions).

[Julesssss]

Working on the notifications doc currently.

[Julesssss]

I realized this is a dupe. Closing this in favour of this issue in which I have listed many possible solutions.