[BUG] [UI Bug] Text rendering glitches after extended conversation

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?

After a long multi-turn conversation, the chat text becomes distorted

<img width="698" height="148" alt="Image" src="https://github.com/user-attachments/assets/50f84383-d39f-4647-8fd5-1243f516ea1d" />

What Should Happen?

normal font

Error Messages/Logs

1. Open the Claude Code client (desktop or web).  
2. Start a back‐and‐forth conversation of about multi conversation.  
3. Scroll up through the chat history or refresh the page.

Steps to Reproduce

any multi conversations

Claude Model

Not sure / Multiple models

Is this a regression?

I don't know

Last Working Version

2.0.13

Claude Code Version

2.0.13

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_