49 nav polish

Spent some time agonizing over polishing this header nav. Hopefully it's a step in the right direction

- added some helpers
- for the nav:
  - 1 vertical level to save as much space as possible and stay consistent
  - tried pink, but it just can't be pink; it's too friggin bold and distracting. after all, the nav should be supporting
  - stuff is contextual; different nav items are shown in the appropriate context
  - it ends up being kind of a mini-breadcrumb + nav. 
    - I think this sort of works; the left elements serve as orientation and the following options serve as navigation choices.