removeAllCalls static method
Removes all calls from the browser's storage, if any.
Implementation
static void removeAllCalls() {
  for (var i = 0; i < web.window.localStorage.length; ++i) {
    final k = web.window.localStorage.key(i);
    if (k?.startsWith('call_') ?? false) {
      web.window.localStorage.removeItem(k!);
    }
  }
}