Describe the bug

I am using 1.19.0 on macOS. When the agent generates a code block inline in the chat, the code uses a variable width font rather than a monospace font.

To Reproduce
Steps to reproduce the behavior:

1. Install Goose 1.19.0 on macOS
2. Ask it to generate some code
3. Code blocks will be rendered in the chat with a variable width font (see below)

Expected behavior

Have code blocks rendered in a monospace font.

Screenshots
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Please provide the following information

• OS & Arch: macOS M1
• Interface: UI
• Version: 1.19.0
• Extensions enabled: Default set
• Provider & Model: Claude on Bedrock

Additional context
Add any other context about the problem here.