Only show favorite apps in overview

The app cards in the overview are currently smaller than they should be, and we show a scrolling version of the app grid below that, which is a bit weird.

We could move the overview a bit closer to the designs relatively easily, if we make the app cards larger, and only show the first row of apps below that. Swiping down or clicking the search entry would move down to the full app grid.

This intermediate state would look something like this:

Longer-term design direction for reference: