fix: Not setting the auth state in Application

frontend/src/components/app.tsx

@@ -22,6 +22,7 @@ import { ILearner } from "../models/learner";
 import { IVocab, VocabType } from "../models/vocab";
 import { IReviewMetadata, ReviewType } from "../models/review";
 import { IUser } from "../models/user";
+import { IResponse } from "../models/server";
 
 interface IProps {
     authenticated: boolean;
@@ -195,7 +196,7 @@ export default class Application extends React.Component<IProps> {
         });
     }
 
-    login = (username: string, password: string): Promise<IUser | {}> => {
+    login = (username: string, password: string): Promise<IUser | IResponse> => {
         return new Promise((res, rej) => {
             fetch(`${BACKEND_URL}/login`, {
                 method: "POST",
@@ -209,15 +210,16 @@ export default class Application extends React.Component<IProps> {
                     password,
                 }),
             }).then(data => data.json())
-                .then(resp => {
+                .then((resp: IResponse) => {
                     if (resp.error === "0") {
                         // Successful login
                         this.props.setUser(resp.data);
                         setSessionToken(window, resp.data.sessionToken);
+                        this.props.setAuthenticated(true);
 
                         res(resp.data);
                     } else {
-                        rej({});
+                        rej(resp);
                     }
                 });
         });