[BUG] No syntax highlighting for GDScript (.gd) files

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?

GDScript (.gd) files have no syntax highlighting in code blocks and diffs. All GDScript code appears as plain white text. Other languages (TypeScript, Python, Rust) are highlighted correctly in the same session.

What Should Happen?

GDScript code should have syntax highlighting (keywords, strings, numbers, types colored) similar to other supported languages.

Error Messages/Logs

Steps to Reproduce

1. Open Claude Code CLI in iTerm2
2. Ask Claude to create/edit a .gd file and a .ts file
3. Compare the diff output — .ts has colors, .gd is plain white

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Unknown

Claude Code Version

2.1.108

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

Code in same session:
<img width="512" height="368" alt="Image" src="https://github.com/user-attachments/assets/e76fa00b-30a8-4984-970e-7b4c7d5adc0c" />

Screenshot from some old version with working highlight:
<img width="494" height="184" alt="Image" src="https://github.com/user-attachments/assets/db3b6c8b-4140-4769-b8e2-27aa8a42ea83" />