[FEATURE] Accept a numerical argument for /rewind

Preflight Checklist

• [x] I have searched [existing requests](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20label%3Aenhancement) and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

I use /rewind frequently. The current workflow requires typing /rewind, waiting for the dialog to appear, pressing the up-arrow key N times, and then pressing ENTER. This is cumbersome when rewinding multiple messages back.

Proposed Solution

/rewind should accept a numerical argument.

/rewind 3 would rewind 3 messages back.

If a code/conversation choice is needed (which is quite rare in my experience), a dialog could be shown as a fallback.

Alternative Solutions

Haven't looked into alternatives. I prefer using raw/barebones Claude Code as much as possible.

Priority

Medium - Would be very helpful

Feature Category

CLI commands and flags

Additional Context

Side note, not directly relevant to the issue: "rewind" is a poor name for international audiences imo. /back would be much clearer.