Cannot see chart text in Windows' high contrast modes

[PtJade-Ceramic]

• Copilot Chat Extension Version: 1.129.1 (user setup)
• VS Code Version:
• OS Version: Windows_NT arm64 10.0.26200
• Feature: N/A
• Selected model: N/A
• Logs: N/A

Steps to Reproduce:

1. The bot gives a Mermaid chart in response.
2. Turn any high contrast mode on in Windows.

Behavior:

Text can only be seen when selected and highlighted: