[BUG] Cowork tab missing on Windows (only Chat and Code shown)

Preflight Checklist

• [ ] 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?

Desktop app version: 1.3109.0.0
OS: Windows (Pro)
Issue: Cowork is visible in web settings, but the Cowork tab does not appear in the Desktop app mode selector (only Chat and Code).
Steps to reproduce: Install Claude Desktop on Windows, open the app, check the mode selector.
Logs: Event Viewer → Windows Logs → Application (see attached screenshot).

<img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/5143fb4a-372c-4151-8575-871e5a231dc8" />

What Should Happen?

Should be able to select Cowork as option in Desktop app selector.

Error Messages/Logs

Steps to Reproduce

1. Install Claude Desktop on Windows
2. Open the app.
3. Check the mode selector.

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

1.3109.0.0

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_