How do I copy the unsent prompt text from Claude Code’s input buffer to the clipboard with keyboard shortcut(s) only?

I’m using Claude Code (v2.x) in the Cursor IDE integrated terminal on Windows 11 25H2 Pro x64. When I’ve typed a prompt into the input box but haven’t sent it yet, I want to extract that text cleanly to the system clipboard, e.g., to save as a template, reuse in another session, or share verbatim. How do I copy the unsent prompt text from Claude Code’s input buffer to the clipboard with keyboard shortcut(s) only?

Example of unsent prompt text in Claude Code’s input buffer:

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