Port popup (appears above or below the clicked port)

• Title: port name and size ("Hong Kong · Giant 99"), then the size's details (see Port sizes).
• Below that, tabs (one showing at a time, so the popup always fits on screen; the tab picked last stays picked for the next port):
  • Market: each commodity's buy and sell price there, green where cheap and red where expensive against its world average.
  • Headquarters / Hub: level, XP, the company XP bonus and the upgrade tree; "Build a hub" instead at a port without one while a hub is available; no tab otherwise.
  • Your trade: what the company has bought and sold there since it began keeping count, each commodity with how much and for how much, ranked by what an industry building for it there would have been worth a month, "Built" where one stands, with a note of what a building does: the commodities best worth a building at that port.
  • Ships (N): the player's ships docked there, each with thin maintenance / fuel / cargo bars and clickable to open its ship popup; the list scrolls past 300 px.