[BUG]Sidebar toggle button overlapped by window controls on Windows 11

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?

<img width="421" height="144" alt="Image" src="https://github.com/user-attachments/assets/f8a996a1-b7ad-4f1d-81e9-bc66c8771173" />
On Windows 11, the sidebar toggle button in the top-left area of Claude Code Desktop is completely hidden behind the native window control buttons (minimize, maximize, close). This makes it impossible to open the sidebar by clicking the button.

What Should Happen?

The sidebar toggle button should be accessible and not overlap with native window controls.

Error Messages/Logs

Steps to Reproduce

1. Open Claude Code Desktop on Windows 11
2. The sidebar is closed by default
3. The sidebar toggle button is inaccessible — it is covered by the window control buttons

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Claude 1.6608.2

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_