Implement full OAuth 2.0 flow for Google Calendar, including token
exchange, refresh, and status checks. Add UI for connecting, syncing,
and disconnecting Google accounts in the Calendar panel.
Additionally:
- Make mobile station selection async with error handling and alerts
- Add HAFAS LocMatch method to API client for finding nearest station
- Expose Google OAuth env vars in Next.js config
fegger
de9a8606ab