use the new session management

src/services/auth.ts

@@ -1,18 +1,12 @@
 import axios from 'axios';
 import { Configuration } from './configuration';
+import { Session } from './session';
 import { User } from '../types';
 
 export class Auth {
-  static async user(): Promise<User> {
-    const token = sessionStorage.getItem('token');
-    if (!token) {
-      return {
-        vatsimId: '',
-        fullName: '',
-        administrator: false,
-        airportConfigurationAccess: [],
-      };
-    }
+  static async user(): Promise<User | undefined> {
+    const token = Session.bearerToken();
+    if (!token) return undefined;
 
     return axios
       .get<User>(`${Configuration.resourceServer}/auth/user`, {
@@ -21,11 +15,6 @@ export class Auth {
         },
       })
       .then((response) => response.data)
-      .catch(() => ({
-        vatsimId: '',
-        fullName: '',
-        administrator: false,
-        airportConfigurationAccess: [],
-      }));
+      .catch(() => undefined);
   }
 }