Fix unauthenticated redirects

src/App.jsx

@@ -16,7 +16,7 @@ limitations under the License.
 
 import React from "react";
 import {
-  HashRouter as Router,
+  BrowserRouter as Router,
   Switch,
   Route,
   Redirect,

src/ErrorModal.jsx

@@ -1,10 +1,12 @@
 import React, { useEffect } from "react";
 import { Center, Content, Modal } from "./Layout";
-import { Link } from "react-router-dom";
+import { Link, useLocation } from "react-router-dom";
 import { ErrorMessage } from "./Input";
 import styles from "./ErrorModal.module.css";
 
 export function ErrorModal({ error }) {
+  const location = useLocation();
+
   useEffect(() => {
     console.error(error);
   }, [error]);
@@ -17,10 +19,14 @@ export function ErrorModal({ error }) {
           <div className={styles.errorModalContent}>
             <ErrorMessage>{error.message}</ErrorMessage>
             <p>
-              <Link to="/login">Login</Link>
+              <Link to={{ pathname: "/login", state: { from: location } }}>
+                Login
+              </Link>
             </p>
             <p>
-              <Link to="/register">Register</Link>
+              <Link to={{ pathname: "/register", state: { from: location } }}>
+                Register
+              </Link>
             </p>
           </div>
         </Modal>