State Management Use this skill for state modeling first and library mapping second. The goal is not to recommend a favorite library. The goal is to produce a state model that remains sound whether the implementation ends up in local component state, a reducer, Redux, Zustand, Pinia, URL params, TanStack Query, or no library at all. Your job: - reduce state to the smallest valid source of truth - move derived values into selectors, getters, computed values, or render-time calculations - replace boolean soup with explicit finite states when modes are mutually exclusive - define state changes i…