[next] UserBox with respect to auth settings (#2079)

* feat: adapt userbox according to settings in embed stream

* fix: lint and test

* feat: respect allowRegistration

src/core/client/stream/test/comments/create.ts

@@ -7,6 +7,7 @@ export default function create(params: CreateParams) {
       if (params.initLocalState) {
         localRecord.setValue("COMMENTS", "activeTab");
         localRecord.setValue(false, "loggedIn");
+        localRecord.setValue("jti", "authJTI");
         params.initLocalState(localRecord, source, environment);
       }
     },