Source chooser breaks layout on mobile
The layout of the app page is broken at the narrow sizes with the new source chooser:
It's especially weird at intermediate sizes right below the breakpoint:
Left-aligning the buttons by setting halign to start in narrow mode fixes the weirdest part about it, but even then it doesn't look great because the two buttons are further away from each other than from the content above, so they don't look grouped:
Reducing spacing between the buttons from 9 to 6px and adding a 6px top margin above the first button helps a bit. It's still not amazing, but given where where we are in the cycle it'd be a minimum viable fix I guess.