Update booking status when chat reaction flags cancellation

You mark consultation messages to signal cancellations, but those changes often stay only in chat. This updates booking records so staff stop outreach within minutes.

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Overview

Cancellations that live only in chat keep coordinators doing redundant outreach and block slots that could be rebooked. This flow turns a chat reaction into an updated booking record so operations and program coordinators stop duplicate outreach and free availability within minutes.