State Management Setup — Zustand/Jotai Store

Create a state management store for [feature] using [Zustand/Jotai]. Requirements:
For Zustand:
- Define state interface with all state properties typed
- Create actions as methods on the store (not separate functions)
- Use immer middleware for immutable state updates
- Add persist middleware for localStorage persistence (selective)
- Add devtools middleware for Redux DevTools integration
- Create custom selector hooks (useUserName, useCartItems, not raw useStore)
- Handle async actions (API calls) with loading/error states
- Add computed/derived values using selectors
- Reset store function for testing and logout
- Split large stores into slices

For Jotai:
- Define base atoms with TypeScript types
- Create derived atoms for computed values
- Use atomWithStorage for persistence
- Create atom families for parameterized atoms
- Group related atoms in a single file
- Provider setup for testing isolation