Agent Skills: state-management

Load PROACTIVELY when task involves application state, data fetching, or form handling. Use when user says \"manage state\", \"add data fetching\", \"set up Zustand\", \"handle form validation\", or \"add React Query\". Covers server state (TanStack Query with caching, optimistic updates), client state (Zustand stores), form state (React Hook Form with Zod validation), URL state (search params, routing), and choosing between state solutions.