[Bug]: font size for tool calls not controllable in settings

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

apps/desktop

Steps to reproduce

I'm on an ultrawide high resolution monitor (Odyssey G9 57" 7680 × 2160) and the font size for the tool calls is extremely tiny and difficult to read. I see there are ways to control the font size in various other typographies but nothing for the tool calls in the chat themselves.

Expected behavior

Expose a tool call font size or just reuse one of the existing fonts for tool calls as well.

Actual behavior

See screenshots. Fonts are ridiculously small for tool calls.

Impact

Minor bug or occasional failure

Version or commit

No response

Environment

macOS desktop

Logs or stack traces

Screenshots, recordings, or supporting files

Workaround

I can scale the entire interface larger (Cmd-+) and shrink the Interface, Prompt, and Terminal fonts accordingly to make the tool call font relatively bigger compared to the other fonts.

Start in apps/desktop by tracing where chat tool calls are rendered and how the existing Interface, Prompt, and Terminal font settings are wired. Check whether tool calls can reuse an existing setting or need a separate one. Done means the tool-call text is readable at high resolution and its size is controllable without making the rest of the interface unbalanced.