AskUserQuestion question text renders white-on-white in light theme (options render fine) — 0.64.22

[wolraich]

cmux version

0.64.22 (102) [ddd4a01]

macOS version

macOS 26.6 (Darwin 25.6.0)

Mac chip

Apple Silicon (M1/M2/M3/M4)

Bug description

When Claude Code calls the AskUserQuestion tool, the fullscreen Claude Code renderer shows the option rows correctly, but the question text above them is invisible. The space is reserved, and drag-selecting the blank area reveals the text (readable while highlighted) — so the text is drawn with a foreground color matching the light background, not missing.

Theme: Light (cmux following light macOS system appearance).

This looks like the light-theme counterpart of #9053 — that fix (post-0.64.20) addressed collapsible blocks rendering white-on-white in dark theme, but the question text element in the AskUserQuestion card still appears to use an unthemed/hard-coded light foreground color, so in light theme it's white-on-white.

Steps to reproduce

1. Set light appearance (macOS system light, cmux following system)
2. Run Claude Code in a workspace
3. Trigger any AskUserQuestion call (e.g. a plan-mode clarification question)
4. Observe: option rows render normally, but no visible question text above them
5. Drag-select the blank area above the options — the question text is revealed while highlighted