Establish screen/page header UI event actions - tap, long-press, etc

[kenmanheimer]

Here are the conventional event/action bindings that we've discussed:

• left button; tap => back to container, long-press => home [dash]
• middle = Location title => depth path, long-press => ?
• right = tap => Location-sensitive actions menu, long => help. Parallels contained-item long-press:
  • location details
  • edit
  • refresh
  • send-to
  • share
  • help