[FEATURE] /rename + Tab key => insert current session name

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

Sometimes you have to adjust the name, not rewrite it completely
For example, when using agents mode, I often append (done) to the session when it's done.
So need a quick way to have a current session name in /rename input string without copy pasting or retyping

Proposed Solution

after typing /rename clicking Tab keyboard key inserts current session name in the input, right after /rename
So /rename Tab click
becomes
/rename [current session name] ready to be edited

Alternative Solutions

_No response_

Priority

High - Significant impact on productivity

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_