Replace the single global priority buttons (focus treasure, regroup, defend)
with per-player direction assignments accessible via clickable pills on each
player's HUD. Each player can now be directed to: Auto, focus a specific
treasure (Earth/Wind/Fire/Ocean), Regroup, or Defend Temples.
- Remove old priority toggle buttons and renderPriorities()
- Add direction pills on partner HUDs and portrait panels
- Implement dropdown menu for selecting directions
- Convert direction choices to priority objects for AI execution
- Increase chat panel height to accommodate new layout
- Add click consumption guard on trade modal trigger