Bump Next.js from v9 to v16.2.6 and add node-ical to
serverExternalPackages. Remove Geist font dependencies in favor
of system fonts. Fix state updates in geocode hooks to prevent
stale closures. Expose ApiClient methods as public and improve
error handling in fetchWithRetry.
Replace mock data in geocoding, HAFAS, and bike routing clients with
actual implementations using fetch and appropriate interfaces. Update
typescript definitions to match the new data structures, including
Journey, Station, and BikeRoute. Add vitest and related testing
dependencies, replacing the placeholder test script with actual tests
for the new client logic. Refactor calendar and countdown utilities to
use the new types and remove unused files.
Implement real API clients and update types
Replace mock data in HafasClient, GeocodingClient, and
BikeRoutingClient with actual fetch implementations. Update
types to match API responses and add Vitest tests.