[BUG] Able to set invalid effort level through VS Code extension UI

Preflight Checklist

• [x] I have searched existing issues 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?

Currently you can set the effort level to "max" through the VS Code exetnsion UI effort level slider
The value is invalid tho

<img width="776" height="550" alt="Image" src="https://github.com/user-attachments/assets/88f00e03-4f99-4dfb-99a5-6c0bf2145227" />

---

<img width="1280" height="226" alt="Image" src="https://github.com/user-attachments/assets/94ce28c9-4386-4b48-8a2b-5fcdcbd46f65" />

What Should Happen?

Update the slider to map only to valid effort level values

Error Messages/Logs

Steps to Reproduce

1. Install Claude Code VS Code extension
2. Open Claude Code chat
3. Click on mode selection
4. Slide the effort level slide all the way to the right, so it says "Max"
5. Check claude code workspace settings file

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.123

Platform

Other

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_