* Switch android to use slide left/right animations on navigation
* Bump the repost icon down by a pixel
* Tune theme colors for contrast and darker bg on darkmode
* Move back handler to a point in the init flow that leads to more consistent capture of events
* Fix image share flow on android
* Fix lint
* Add todo about sharing not available
* Drop the android slide animation because it's too slow
* Fix 'flashes of white' in dark mode android
