React 19's react-reconciler@0.33 mutation path calls commitUpdate with
(instance, type, oldProps, newProps, fiber), but our Ink host config
still expected an updatePayload from prepareUpdate. That left mounted
ink-* nodes with stale onKeyDown, tabIndex, and textStyles, making menu
navigation and highlights appear stuck until remount.
Diff old/new props directly inside commitUpdate and add regression tests
covering in-place updates for ink-box handlers/attributes and ink-text
styles.
