Feature request: Please add true conversation editing to ChatGPT.

For long conversations, I would like to be able to:

Delete individual messages without deleting the whole chat
Copy selected messages into another chat
Cut and paste portions of conversations
Reorder or consolidate selected messages
Save a cleaned-up copy of a conversation while preserving the original
Rename chats easily

Branching is useful, but it does not solve the problem of curating a long conversation where only certain portions should be retained.

A true conversation-editing mode would make ChatGPT much more efficient for users who maintain long-running topical conversations.