Make scheduling hold window configurable

Allow companies to configure how long temporary scheduling holds last during booking, instead of using a fixed five-minute window for all teams.

Transcript Context

The team said the current five-minute hold can be too short to complete scheduling, and asked whether it could be increased to something like 10 minutes. The suggested direction was a setting with preset options such as 5, 10, or 15 minutes so each company can choose the hold period that fits its workflow. The request is specifically for a configurable company-level option rather than a single global change.