# KeyButton Owner-approved momentary keyboard/pointer visualization (Mission Core, 2026-09-25). Outlined square key surface; pressed is white with black text in every theme. This explicit outline identifies a key, not a decorative panel border. `label` is the complete accessible action; children are the short key legend. `pressed` is controlled and never toggled by the component. Native button keyboard semantics, disabled behavior and focus indicator are retained. Consumers own pointer capture and release, keyboard scope, blur/cancel/unmount handling and any domain command lease. A displayed pressed key is not an acknowledgement from equipment. Disabled always renders released. No global listeners exist. Catalog includes idle, pressed, disabled and focusable surfaces. Use only for momentary key input, not ordinary actions (Button) or mode choice (SegmentedControl).