Supabase Auth Session Not Persisting Across Page Reloads

1. Missing localStorage persistence in Supabase client initialization
2. Incorrect session storage configuration in createClient()
3. localStorage disabled in browser or private browsing mode
4. Auth state listener not properly initialized before component mount
5. Session token expired without refresh token handling

Initialize Supabase client with proper storage configuration:

const supabase = createClient(URL, KEY, {
  auth: {
    storage: localStorage,
    autoRefreshToken: true,
    persistSession: true
  }
})

Add auth state listener on app mount to restore session from localStorage.