- routing.ts: add a 'transit' travel mode via Transitous (MOTIS 2 API, keyless,
open CORS), with a local precision-7 polyline decoder and per-leg parsing.
Road modes stay on keyless OSRM; moto remains ≈car and honestly labelled.
- RouteDialog: transit draws each leg (walk dashed grey, transit coloured by
mode) and summarises depart→arrive, duration, transfers and line chips, with
Transitous/OpenStreetMap attribution.
- directions.ts: opt-in 'Open in' handoff to Google / Apple / OpenStreetMap
(+ Organic Maps via geo: on Android), mode-aware. In-app routing stays the
default; the description notes transit shares the trip with Transitous.
- No scooter/moped profile (deliberate).
