Suppress automated messages based on recent manual conversation

Problem: Currently, automated messages (like "hope you're having a great stay") send regardless of whether the host has already had a manual conversation with the guest. This can make the automation feel redundant and impersonal.

Proposed Solution: Add logic to automatically suppress or cancel a scheduled/automated message if a manual message has been sent by the host within a customizable timeframe (e.g., X hours) prior to the automated message's send time.

Impact: This would prevent awkward, redundant messaging and ensure the guest experience feels more human and attentive.