frontend/src/store/authStore.js

import { create } from 'zustand'
import { persist } from 'zustand/middleware'

export const useAuthStore = create(
  persist(
    (set) => ({
      token: null,
      user: null,
      isAuthenticated: false,
      
      setAuth: (token, user) => set({
        token, user, isAuthenticated: true
      }),
      
      clearAuth: () => set({
        token: null, user: null, isAuthenticated: false
      })
    }),
    { name: 'senti-auth' }
  )
)