Implement the "UI" section from the parent issue design document.

See the "Main concepts" and "API" sections for context.

Implementation plan

• Events page
• References from resource pages to the events page
  • Run page
  • Job page
  • Fleet page
  • Project page (the within_projects filter)
  • User page
    • Reference to user events (the target_users filter)
    • Reference to user activity (the actors filter)