[BUG] /usage → Stats → Models, 'Tokens per Day' chart does not render lines in per-series colors

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

On /usage → Stats → Models, the 'Tokens per Day' chart renders all model lines in magenta. Cause: the per-series colors are passed through a converter that only parses rgb(r,g,b) and falls back to hardcoded \x1B[35m (magenta) for the theme's ansi:-named colors; the legend bullets use the raw theme color via a separate path and render correctly.

What Should Happen?

The per-series colors are passed through a converter that only parses rgb(r,g,b). The legend bullets use the raw theme color via a separate path and render correctly. The code computes a separate line series per model and explicitly passes a per-series colors array to the plot. The intent is right there in the source. It only fails at the last step because D$6 can't parse the theme's ansi: colors and falls back to magenta.

Error Messages/Logs

Steps to Reproduce

in Claude Code console, type:
/usage

Then select: Stats -> Models and view the chart's line colors

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.158

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

<img width="1730" height="924" alt="Image" src="https://github.com/user-attachments/assets/044860b0-105d-4cfd-9655-9d2a422db9c3" />