Feature Request: Support renaming conversation history entries in VSCode extension

Summary

The VSCode extension auto-generates conversation titles based on the first message, but there is no way to manually rename them.

Problem

When users have multiple conversations, the auto-generated titles make it difficult to distinguish between them. Users currently cannot rename conversation history entries to something more meaningful.

Proposed Solution

Allow users to rename conversation history entries, for example by right-clicking on an entry and selecting "Rename".

Additional Context

This would greatly improve the usability of the conversation history panel, especially for users who manage multiple ongoing conversations.