Add the first widget implementation, the minimal widget. This took a
good 2 days of hacking and frustration to get the first prototype
working. And even then, its currently scoped to android 12 until I'm
able to port them. The implementation is still quite rough, but should
become manageable over time. More widgets will come.
Improve the black theme selection color by merging it with the dark
theme selection coler. This makes the selection color both more
noticable and reduces the style complexity that came from having to
manage two different selection colors.
