- Added LoadoutSelectionDialog for choosing loadout when starting session
- Added set_cost_tracker() method to HUDOverlay for SessionCostTracker integration
- Added new display row for loadout metrics: $/shot, $/hit, $/heal, hits, heals
- Added mindforce cost support
- Updated start_session() to accept loadout_id and per-action costs
- Updated _refresh_display() to show new cost metrics