feat(auth): add callback, silent renew and logout routes

src/pages/LogoutPage.tsx

@@ -0,0 +1,7 @@
+import { useEffect } from 'react'
+import { useAuth } from 'auth/AuthProvider'
+export default function LogoutPage() {
+  const { signOut } = useAuth()
+  useEffect(() => { void signOut() }, [signOut])
+  return <p>Signing out…</p>
+}