[BUG] Text Rendering Visual Glitch

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?

Text is rendered with characters incorrectly split across different colors (e.g., the word "code" displays with "co" in red and "de" in white), which is not the intended behavior. This issue was introduced after the last working version 2.1.2 and has persisted in all subsequent releases up to the latest 2.1.27. The bug is consistently reproducible on Windows 11 when running the application in either cmd.exe or Microsoft Terminal.

<img width="1331" height="701" alt="Image" src="https://github.com/user-attachments/assets/288192b2-6fd1-4bbc-8122-5d519c13a01f" />

What Should Happen?

Text should be rendered as a single continuous string with the correct intended color for the entire word/phrase (no random color splitting of individual characters within a single word). For example, the full word "code" should display in one uniform color (e.g., all red or all white) as designed, with no character-by-character color variation for a single text element.

Error Messages/Logs

Steps to Reproduce

Install the affected version of the application (2.1.3+ up to latest 2.1.27) on a Windows 11 system.
Launch either the native cmd.exe or Microsoft Terminal on the Windows 11 machine.
Run the application via the opened terminal (using the standard launch command for the app).
Trigger the text rendering functionality (e.g., generate/display the content that includes colored text strings like "code").
Observe the incorrect character splitting and mixed-color rendering of single words/phrases.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.2

Claude Code Version

2.1.27

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_