Zustand is a small state-management library for React: a store is a hook, components subscribe to slices of it with selectors, and no context provider is needed. Use when a user asks to "add a Zustand store", "share state between components without Redux", "persist state to localStorage", "fix Maximum update depth exceeded after upgrading to Zustand v5", "use Zustand with Next.js", or wants the persist, devtools, immer or subscribeWithSelector middleware. Covers the v5 API: typed stores, useShallow, middleware order, access outside React, and per-request stores.
