web: fix redirect when accessing authentik URLs authenticated

closes #3174

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

web/src/api/Users.ts

@@ -43,7 +43,10 @@ export function me(): Promise<SessionUser> {
                     },
                 };
                 if (ex.response.status === 401 || ex.response.status === 403) {
-                    window.location.assign("/");
+                    const relativeUrl = window.location
+                        .toString()
+                        .substring(window.location.origin.length);
+                    window.location.assign(`/flows/-/default/authentication/?next=${encodeURIComponent(relativeUrl)}`);
                 }
                 return defaultUser;
             });