- New post shows image/video previews; the TikTok panel shows a preview of what will be posted
- Videos longer than the account's TikTok limit (creator_info) block saving with a clear message
- If TikTok's creator info says the account can't post now, the panel shows TikTok's message and saving is blocked
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>