fix: remove unused navigate variable from Login.tsx

Remove const navigate = useNavigate() and the useNavigate import since
the success path now uses window.location.href = '/' instead.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

src/pages/Login.tsx

@@ -1,5 +1,5 @@
 import { useState } from 'react'
-import { Link, useNavigate } from 'react-router-dom'
+import { Link } from 'react-router-dom'
 import { authClient } from '../lib/auth-client.ts'
 import { useAuthStore } from '../stores/auth.ts'
 
@@ -8,7 +8,6 @@ export function Login() {
   const [password, setPassword] = useState('')
   const [error, setError] = useState('')
   const [loading, setLoading] = useState(false)
-  const navigate = useNavigate()
   const setAuthenticated = useAuthStore((s) => s.setAuthenticated)
 
   async function handleSubmit(e: React.FormEvent) {