React example for feature-state and feature-react/state. It shows how one state model can drive React UI, derived values, feature-added methods, and persisted preferences without moving everything into component-local state.

• createState with useFeatureState
• derived values with useCompute
• typed undo behavior with undoFeature()
• persisted settings with localStorageFeature()
• render counters for subscription behavior

pnpm dev