peekThreadOmni method
Implementation
bool peekThreadOmni(String shortLink) {
ModeratorEntry? target = findModeratorEntryByShortLink(shortLink);
if (target == null) return false;
final surl = target.siteUrl.isNotEmpty ? target.siteUrl : _homeSite;
final li = _sites[surl]!.peekThreadOmni(shortLink);
if (li == null) return false;
return true;
}