[FEATURE] Command to save latest Claude response as markdown

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 often find myself asking CC to write the latest output as a markdown document (e.g. to share elsewhere).

Proposed Solution

It would be great if there was a command to do that, for example

/save foo.md

Alternative Solutions

_No response_

Priority

Medium - Would be very helpful

Feature Category

Interactive mode (TUI)

Use Case Example

_No response_

Additional Context

_No response_