rettiwt 7.0.0 silently returns empty — one-line patch fixes it

If you upgrade rettiwt (X scraping lib) to 7.0.0 and every feed / search / timeline call returns empty with no error, it's a null-access crash in node_modules/rettiwt-api/dist/models/User.js around line 49. One-line patch: change `pinned_tweet_ids_str[0]` to `pinned_tweet_ids_str?.[0]`. Saves ~3 hours of 'why is my scraper returning nothing.' Re-apply after every upgrade.