VS Code extension: selected text in the transcript cannot be copied (Cmd+C does nothing)

Problem

In the Claude Code VS Code extension, the user's previously-submitted messages are rendered in the transcript just above the chat input. The text can be selected with the mouse, but Cmd+C / Ctrl+C does not copy the selection to the clipboard — nothing lands on the clipboard, or the selection is silently swallowed.

This makes it impossible to reuse a previous prompt by copy-pasting it back into the input, which is a basic affordance every chat / terminal UI provides.

Steps to reproduce

1. Open Claude Code in VS Code.
2. Send any message so it appears in the transcript.
3. Select the rendered text of that message with the mouse.
4. Press Cmd+C (macOS) / Ctrl+C.
5. Paste into the input box or any other editor — nothing is pasted.

Expected

Selected text in the transcript should be copyable to the system clipboard with the standard OS shortcut, the same as any other text content in VS Code.

Environment

• Claude Code VS Code extension
• macOS (Darwin 24.6.0)