Threaded Replies

When a message generates a long discussion, reply in a thread instead of polluting the main conversation. Threads are depth-1 (Slack-style) — you can't reply to a reply.

How to start a thread

1. Hover the parent message — A 'Reply in thread' button appears on the right.
2. Click it — A side panel opens on the right with the parent and an empty replies list.
3. Write your reply — Type in the composer at the bottom of the side panel and press Enter.
4. See the reply count — Back in the main timeline, the parent now shows 'X replies' — clicking it reopens the thread.

Rules

• Threads are depth-1: you cannot reply to a reply (the server returns 400)
• You cannot reply to a deleted parent message
• Replies are scoped to the same conversation as the parent
• Reply count updates live via WebSocket