[BUG] claude default copy chars to tmux at v 2.1.209

### Preflight Checklist

- [x] I have searched [existing issues](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug) and this hasn't been reported yet
- [x] This is a single bug report (please file separate reports for different bugs)
- [x] I am using the latest version of Claude Code

### What's Wrong?

claude will default copy chars to tmux buffer at v 2.1.209. who do this function? It should decided by user use it or not. And there is no config file to close it .

### What Should Happen?

claude should disable this function first

### Error Messages/Logs

```shell
copied xxx chars to tmux buffer paste with prefix +.
```

### Steps to Reproduce

1 use mouse to choose a char in chat.
2 then "copied xxx chars to tmux buffer paste with prefix +." will appear at the right-down corner of chat

### Claude Model

None

### Is this a regression?

I don't know

### Last Working Version

_No response_

### Claude Code Version

2.1.209

### Platform

Anthropic API

### Operating System

Ubuntu/Debian Linux

### Terminal/Shell

Terminal.app (macOS)

### Additional Information

_No response_