R1:300c74c49dc9

Make mobile navigation work properly by default in more cases

Summary:
Fixes T5752. This obsoletes a bunch of old patterns and I'll follow up on those with a big "go do a bunch of mechanical code changes" task. Major goals are:

- Don't load named queries multiple times on search pages.
- Don't require extra code to get standard navigation right on mobile.
- Reduce the amount of boilerplate in ListControllers.
- Reduce the amount of boilerplate around navigation/menus in all controllers.