Zustand lightweight state manager

Manage state simply with Zustand. Implementation: 1. create() store with actions. 2. Minimal boilerplate vs Redux. 3. No providers needed. 4. Middleware for persistence. 5. Devtools integration. 6. Slices pattern for large stores. 7. Immer for mutations. 8. TypeScript support. Use selectors to prevent unnecessary renders and implement computed values with get() in store.