Transit directions and a transit map style

Apple Maps has transit directions (walk, ride, transfer, walk) with line colours, departure times and a transit map style. ts-maps directions support driving, walking and cycling only (TransportProfile).

Scope

• Add a transit profile to the directions interface, with steps carrying line name, colour, headsign, stops and departure/arrival times.
• Provider adapters where available: OpenTripPlanner (open, GTFS) first, then Google/Mapbox where supported.
• Route preview cards and turn-by-turn wording for transit legs ("Take the N Judah toward Ocean Beach, 6 stops").
• A transit map style emphasising lines and stations (OpenMapTiles transportation rail/transit classes plus station POIs).
• Bindings parity for any new props.