[FEATURE] Themeable selected-row highlight for /config & interactive option-list menus (low-vision a11y)

Summary

Custom themes can color the selected item in the slash-command autocomplete (via the suggestion token), but there is no themeable color for the selected/active row in the interactive option-list menus — e.g. /config, /status → settings, and other Select/MultiSelect pickers. In those menus the active option is distinguished only by the ❯ cursor marker. For low-vision users who rely on strong color/contrast (not a small glyph) to tell which option is active, this makes those menus hard to use.

Who this affects

Low-vision users, and anyone using a high-contrast theme. I'm a low-vision user navigating with a screen magnifier, so I only see a slice of the screen at a time and rely on color as a landmark. A single small ❯ glyph is easy to lose under magnification; a strongly colored row (or a background bar) is not.

Current behavior

• Slash-command autocomplete: the selected row uses the suggestion token, so I can override it (e.g. bright gold) and the active item becomes unmistakable. 👍
• /config / /status settings option-lists: the selected row has no themeable color. I tested overriding suggestion, inactive, and permission — none change the selected row there. The only differentiator is the ❯ marker (colored by success).

Requested change

Expose a themeable highlight for the selected/active row in option-list / picker menus, ideally:

1. A selected-row foreground token (so the active option's text can be a high-contrast color), and
2. A selected-row background token — a solid background "bar" behind the active row.

A background-bar highlight would be the single most effective cue: color-on-color foreground differences are much harder to perceive (especially under magnification) than a filled bar.

Alternatives considered

• Overriding existing tokens (suggestion, inactive, permission, selectionBg) — none affect these menus' selected row. selectionBg only affects mouse text selection.
• Relying on the ❯ marker alone — works, but a small glyph is insufficient for low vision under magnification.

Environment

• Claude Code 2.1.168, macOS (Apple Terminal), fullscreen renderer (/tui fullscreen).
• Custom high-contrast (WCAG AAA) theme.

Related

• #11002 (screen-reader mode) — same accessibility area (area:tui, area:a11y), but distinct: this is about visual contrast of the selected row for low-vision (not blind) users.

Thanks! 🙏