Summary

When a host reschedules a booking, this now checks if the guest (attendee) is a Cal.com user. If they are, the system fetches their availability and only shows time slots when BOTH the host AND the guest are available.

Problem

As described in #16378, when a host reschedules a booking, the current system doesn’t consider the guest’s availability - it just shows the host’s available slots. This can lead to hosts choosing times when the guest is actually busy.

Solution

1. When rescheduleUid is present in the slot calculation:

   • Fetch the original booking with attendees
   • Check if any attendee is a Cal.com user (by email lookup)
   • If yes, fetch their availability for the date range
   • Intersect host availability with guest availability
   • Only return time slots where both parties are free

2. Graceful degradation:

   • If guest is not a Cal.com user: show all host’s available slots (current behavior)
   • If availability fetch fails: fall back to host-only availability
   • Logged for debugging without blocking the flow

Changes

• Added _getGuestAvailabilityForReschedule helper method in AvailableSlotsService
• Integrated availability intersection in _getAvailableSlots after aggregated availability is calculated

Testing

• Host reschedules with non-Cal.com guest: shows all host slots (unchanged)
• Host reschedules with Cal.com guest: shows only mutual availability
• Error handling: graceful fallback on failures

Closes #16378 /claim #16378

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