Terminal UI uses Unicode symbols instead of plain English in output

Problem

Claude Code's terminal output uses Unicode symbols as structural markers instead of plain English words. This makes output read like a captcha rather than natural text.

Examples from a real session:

Screenshot with normal display (no highligthing):
<img width="1176" height="355" alt="Image" src="https://github.com/user-attachments/assets/28e35549-e139-4099-8e89-daa6ace16072" />

Screenshot with highlighted display:
<img width="1205" height="346" alt="Image" src="https://github.com/user-attachments/assets/93a6df6e-7600-4d2a-97d2-d1376d91aee5" />

Expected behavior

Terminal output should be readable as plain English without needing to decode symbol meanings.

Environment

• Claude Code version: 2.1.41
• Model: claude-opus-4-6 (model ID: claude-opus-4-6)
• macOS (Darwin 25.2.0)