[BUG] Web claude code chat session is wider than available space when refreshing the page.

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?

when I refresh a web claude code page because the session is not showing up correctly, attached is an image of the issue. this has been since the changes last week. related may be the issue with the copy button not showing up in the code windows.

<img width="1125" height="133" alt="Image" src="https://github.com/user-attachments/assets/cab1a843-efb4-46d1-b1d7-7c89ca04e46d" />

What Should Happen?

refresh should reshape to fit.

Error Messages/Logs

Steps to Reproduce

create a very long session, then once the session stops rendering we'll, refresh the browser page and watch the text flow outside of the text area.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

4.5

Claude Code Version

I'm Claude Sonnet 4.5 (model ID: claude-sonnet-4-5-20250929). This is running within Claude Code, Anthropic's official CLI tool for software engineering tasks.

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_