Segmented Control

Horizontal group of 2–4 mutually exclusive options rendered as one pill/track — a lighter switch than Tabs for toggling a view, time range, unit, sort order, or mode (e.g. List/Grid, Day/Week/Month, °C/°F, Light/Dark). Built as an accessible radiogroup: arrow keys (and Home/End) roving-focus and select, each segment is a role=radio with aria-checked, there's a focus-visible ring, per-segment disabling, and it works controlled or uncontrolled via a string value with onValueChange. Unlike Tabs it doesn't manage panels — it's only the selector — and unlike a Switch it supports more than two choic