TimeToLeave — Implementation Checklist

#	Step	✅	✔️
1	Project scaffolding & baseline setup	[x]	[x]
2	Environment config + constants (`src/lib/constants.ts`)	[x]	[x]
3	Types (`src/types/index.ts`)	[x]	[x]
4	Geocode client + route + hook + component	[x]	[x]
5	Journeys client + route + hook + component	[x]	[x]
6	Bike routing client + route + hook + component	[x]	[x]
7	WienerLinien client + route + hook + component	[x]	[x]
8	Wire `useWienerLinien` and `<WienerLinienSection>` into `EventCard.tsx`	[x]	[ ]
9	End-to-end integration test for full event card	[ ]	[ ]
10	Polish: loading skeletons, empty states, dark-mode audit	[ ]	[ ]