Auto label on tool selection hard to read in dark themed editor

[rajbos]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
If applicable, add screenshots to help explain your problem.

Environment (please complete the following information):

• OS: [e.g. Windows 11, macOS Sonoma, Ubuntu 22.04]
• VS Code Version: [e.g. 1.95.0]
• Extension Version: [e.g. 0.0.1]
• GitHub Copilot Extension Version: [e.g. 1.140.0]

Copilot Usage Context:

• Do you use GitHub Copilot on multiple machines? [Yes/No]
• Do you use GitHub Copilot in the web version? [Yes/No]
• Approximately when did you first install GitHub Copilot Chat? [e.g. 3 months ago]

Additional context
Add any other context about the problem here.

Logs (if applicable)
If the extension shows unexpected behavior, you can help by sharing:

• Any error messages from VS Code Developer Tools (Help > Toggle Developer Tools)
• Contents of VS Code output panel for "Copilot Token Tracker" (if available)

[github-actions]

Tagging @rajbos for notifications