zustand auf server wiederhergestellt

gsm-frontend/src/pages/AuthCallback.jsx

@@ -0,0 +1,28 @@
+import { useEffect } from 'react'
+import { useSearchParams, useNavigate } from 'react-router-dom'
+
+export default function AuthCallback({ onLogin }) {
+  const [searchParams] = useSearchParams()
+  const navigate = useNavigate()
+
+  useEffect(() => {
+    const token = searchParams.get('token')
+
+    if (token) {
+      onLogin(token)
+      navigate('/', { replace: true })
+    } else {
+      // No token received, redirect to login with error
+      navigate('/login?error=oauth_failed', { replace: true })
+    }
+  }, [searchParams, onLogin, navigate])
+
+  return (
+    <div className="min-h-screen bg-gray-900 flex items-center justify-center">
+      <div className="text-center">
+        <div className="animate-spin rounded-full h-12 w-12 border-t-2 border-b-2 border-blue-500 mx-auto mb-4"></div>
+        <p className="text-gray-400">Anmeldung wird verarbeitet...</p>
+      </div>
+    </div>
+  )
+}