Show 'accept invite UI' for re-invite, calm progress spinner

ts/util/index.ts

@@ -19,6 +19,7 @@ import { makeLookup } from './makeLookup';
 import { migrateColor } from './migrateColor';
 import { missingCaseError } from './missingCaseError';
 import { parseRemoteClientExpiration } from './parseRemoteClientExpiration';
+import { sleep } from './sleep';
 import * as zkgroup from './zkgroup';
 
 export {
@@ -41,5 +42,6 @@ export {
   missingCaseError,
   parseRemoteClientExpiration,
   Registration,
+  sleep,
   zkgroup,
 };