Fix infinite redirect loop: super_admin no longer redirects to /admin

The /admin route was removed when CP was moved to cp.hotelsync.ru.
Logged-in super_admin sessions were causing a redirect loop to a
non-existent route, resulting in a blank page on app.hotelsync.ru.

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

src/pages/LoginPage.tsx

@@ -43,8 +43,7 @@ function LoginForm({ onSwitch }: { onSwitch: () => void }) {
     const loggedIn = await login(email, password)
     setLoading(false)
     if (!loggedIn) { setError('Неверный email или пароль'); return }
-    if (loggedIn.role === 'super_admin') navigate('/admin')
-    else navigate('/calendar')
+    navigate('/calendar')
   }
 
   return (
@@ -470,7 +469,6 @@ export function LoginPage() {
   const [mode, setMode] = useState<'login' | 'register'>('login')
 
   if (user) {
-    if (user.role === 'super_admin') return <Navigate to="/admin" replace />
     return <Navigate to="/calendar" replace />
   }