Fixes:
- All route polylines removed from map by default. Click a plane to show its great circle route. Click another plane to swap. Route persists until you select a different flight or it lands.
- Origin/destination markers — Green dot + ICAO label at origin, red dot + label at destination when a flight is selected
- Map Style button removed — Alternate Mapbox styles were crashing the game
- Duplicate KRDM in Wings — Redmond appeared twice in hub selector. Deduped in display + all 4 hub purchase paths now prevent duplicates