[Feature Request] Add keyboard shortcut to copy last assistant response as Markdown

Bug Description
▎ Feature request: Please add a single-keystroke shortcut to copy the last assistant response to the clipboard (as Markdown), similar to:
▎ - Codex CLI's Ctrl+O (or /copy slash command)
▎ - pi coding agent's Ctrl+X (app.message.copy)
▎
▎ Currently Claude Code only supports copying via manual text selection + Ctrl+Shift+C/Cmd+C, which is slower for grabbing full responses (especially long ones or ones with code blocks) than a dedicated one-key copy action.

Environment Info

• Platform: darwin
• Terminal: iTerm.app
• Version: 2.1.233
• Feedback ID: 963d9d45-1855-4b98-b706-a65cf170709a

Errors

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