Send confirmation message for mailbox reaction in thread

Your support messages marked with the mailbox reaction go unacknowledged, creating triage delays and lost context. It posts a threaded confirmation so on-call staff see status within minutes.

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Overview

When a teammate flags a message as a request, it often goes unacknowledged and delays triage. This flow turns the mailbox reaction into an immediate threaded confirmation and temporary marker so service desk agents see status and can act within minutes.