Exclude Unsubscribed Bot Users from Unanswered Filter

We've refined the Unanswered filter to better support live chat agents by excluding unsubscribed users. 

Now, if a user has replied "STOP" or unsubscribed as their last message, they will no longer appear in the default unanswered filter. 

This adjustment focuses the filter on users who actively require responses, helping agents prioritize conversations that truly need attention.