## The Issue
When CALENDAR_BOOKING_PAGE_ID env variable is not configured, the
onboarding flow still sets the booking step as pending in the database.
This causes users to get stuck on a broken booking page after
logout/login, as the Cal.com iframe tries to load with an empty calendar
link.
## The Fix
Made the booking step handling idempotent across the stack:
Backend:
- setOnboardingBookOnboardingPending now checks if calendar is actually
configured before setting the step as pending
- getOnboardingStatus auto-cleans invalid booking states when detected
(booking pending but no calendar configured)
- Empty strings in env are now treated as undefined in client config
Frontend:
- Added navigation protection to redirect away from booking pages when
calendar isn't configured
- Existing defensive logic in useSetNextOnboardingStatus already skips
booking when no calendar ID
Result
- New users won't get invalid booking states
- Existing bad data self-heals when users interact with the system
- Backend and frontend stay in sync about when booking should be shown
Fixes the issue Felix reported where users saw a broken booking page in
production.
I think we should keep the old CAL_LINK constant for now - while we
could remove the booking onboarding step entirely, it would break the
plan/pricing modal which uses it as a fallback when no calendar is
configured. Open for discussion! -- May be we dont show the `Book a
Call` button if the env is not set -- but we should keep it as it is if
we want two different behaviors :)
closes https://github.com/twentyhq/core-team-issues/issues/1558
