Enable users to follow thread messages and receive updates

[Pratheek555]

As an EmbeddedChat developer

I need to: Enable users to follow specific thread messages they are interested in.

So That: They can stay updated on ongoing discussions without actively monitoring the entire channel.

Problem Statement

Currently, users participating in EmbeddedChat threads have no way to explicitly follow a thread. This makes it difficult to track important discussions, especially in busy chats where multiple threads are active simultaneously. Users often miss updates unless they manually revisit the thread.

Acceptance Criteria

• [ ] A “Follow / Unfollow Thread” action is available for thread messages
• [ ] Users can follow a thread without needing to send a message in it
• [ ] Shows exactly two avatars amongst the list of users, and rest are shown in a "+2" users format.