[FEATURE] add /copy command to claude code for VS Code

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

I believe this now exists in the form of the /copy slash command, which copies the last response to the clipboard as markdown.

_Originally posted by @evnoj in #859_

But this slash command only stay in cli version, not in vs code extension (as current extension version 2.1.63)

Proposed Solution

just like /simplify, /insights or /compact, add /copy into UI, which provide same functionality.

Alternative Solutions

_No response_

Priority

Low - Nice to have

Feature Category

Other

Use Case Example

_No response_

Additional Context

<img width="639" height="566" alt="Image" src="https://github.com/user-attachments/assets/b00fa05f-a7f4-437c-a195-bd6e56dc5083" />

Like insert the /copy command to here