[BUG] Mac desktop app: Black overlay from sidebar covers chat content

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?

In the Mac desktop app, the left sidebar renders a black overlay that bleeds into the chat panel, covering the left portion of chat messages. The text is partially visible but cut off, making it impossible to read the full conversation.

This has been happening for several versions.

What Should Happen?

The chat content should be fully visible without any overlay from the sidebar. The sidebar and chat panel should render in their respective areas without overlap.

Error Messages/Logs

Steps to Reproduce

1. Open the Claude Code desktop app on macOS
2. 2. Open any conversation
3. 3. Observe that the left side of the chat panel is covered by a black overlay from the sidebar background

The issue is persistent across all conversations and occurs immediately on app launch. Resizing the window sometimes temporarily reduces the effect.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

latest (desktop app for Mac)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_