[FEATURE] Show compression progress percentage in CLI

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

When conversation is being compressed, I can only see "대화를 계속하기 위해 압축하고 있습니다... 87%"

It would be helpful to show this compression progress percentage in the CLI version as well, so users know the progress status.

Proposed Solution

Display compression progress percentage in the CLI terminal, similar to how it's shown in the VS Code extension.

Example output:
Compressing conversation... 87%

Alternative Solutions

_No response_

Priority

Critical - Blocking my work

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_