Landscape / large screen layout needed #69

I know you know, I just wanted an issue to track this.

Here's the current design on the actual device, as a video walkthrough.
https://photos.app.goo.gl/C5kmmCE2RgFJZ8D77

Hopefully the problems you see above are the same you'll see on a table device. If not, do borrow the chromebox to be sure.

Things to fix:

• Huge face on first screen
• Buttons are too horizontal (plus relatively small vertical target size)
• Too-big grid tiles in team page
• Bottom tabs too small and far apart
• Portraits on the team assignment screen are weirdly positioned and cut off (0:45)
• Close buttons of modals are probably too small, relatively speaking

Note: There's still a little bit of jank on first "Start" (watch the ink splash freeze), but that's not the point of this issue. (If you want, we can track this elsewhere.)