Refined Read Receipts for Assigned Agents in Live Chat

We've refined the way read receipts are managed in Live Chat:

The last_agent_read_at timestamp will now only be updated if the conversation is assigned to a specific agent, and that assigned agent views the messages.

This change ensures that read statuses accurately reflect the engagement of assigned agents, enhancing accountability and precision in chat management.

Leverage this update to improve team coordination and response accuracy!