fix: correct AuthContext import in Verify.jsx

Fixed build error where AuthContext was imported directly instead of using the useAuth hook.
Changed from import { AuthContext } + useContext(AuthContext) to import { useAuth } + useAuth().

This was blocking the Docker build and production deployment of v9c.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/pages/Verify.jsx

@@ -1,13 +1,13 @@
-import { useState, useEffect, useContext } from 'react'
+import { useState, useEffect } from 'react'
 import { useSearchParams, useNavigate } from 'react-router-dom'
-import { AuthContext } from '../context/AuthContext'
+import { useAuth } from '../context/AuthContext'
 import { api } from '../utils/api'
 
 export default function Verify() {
   const [searchParams] = useSearchParams()
   const token = searchParams.get('token')
   const navigate = useNavigate()
-  const { login } = useContext(AuthContext)
+  const { login } = useAuth()
 
   const [status, setStatus] = useState('loading') // loading | success | error
   const [error, setError] = useState(null)