Implemented Zustand Auth Store with Persisitence

[Lansa-18]

closes #410

Description

Implemented a global authentication state management solution using Zustand with localStorage persistence and secure cookie synchronization for seamless SSR/CSR authentication in ManageHub.

Acceptance Criteria Met

State Management

• accessToken - JWT access token
• refreshToken - Token for refresh flow
• user - Complete user profile object
• isAuthenticated - Boolean authentication status
• tokenExpiresAt - Token expiration timestamp

Core Actions

• setAuth() - Sets authentication state with auto-calculated expiry
• updateUser() - Merges partial user updates
• clearAuth() - Clears state and removes all cookies/storage

Persistence & Synchronization

• localStorage persistence with key "auth-storage"
• Cookie sync for accessToken
• 7-day cookie expiry
• Secure cookies with SameSite=Strict and Secure=true
• Automatic cleanup on logout

Developer Experience

• Helper selectors: useIsAuthenticated(), useUser(), useToken()
• Additional selectors: useRefreshToken(), useTokenExpiresAt(), useAuthActions()
• Hydration guard: useHasHydrated() for SSR safety

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