Show Vrbo guest messages in Hospitable conversation thread

Problem Statement:

• Guest messages sent from Hospitable's Inbox for Vrbo bookings don't appear in the reservation's conversation thread
• Messages only show as "sent" in the Activity log, but the full message history is not visible in the conversation thread

Current Workaround:

• Checking the Activity log on the left side of the reservation to confirm messages were sent
• Guests' messages are delivered through Vrbo's native messaging system, but the thread isn't synced back into Hospitable's conversation view

Impact:

• Hard to track the full conversation history within Hospitable
• Requires switching between Activity log and other views to understand guest communication
• Reduces visibility into guest interactions for Vrbo bookings

Proposed Solution:

• Display Vrbo guest messages within the reservation's conversation thread in Hospitable, similar to how Direct and manual bookings work

Unlock:

• Full visibility into guest communication for all booking types within Hospitable
• Streamlined workflow for managing guest conversations without switching views