Post preview

Pre-publish preview for a draft (by postId or raw text): returns the exact message that will be sent — title, body and the channel header and footer assembled as on publish, with typography normalized — its quality score, and a single list of warnings (empty draft, Telegram length limits, banlist hits, near-duplicates) plus a publishReady flag. Length is counted the way Telegram counts it and respects the 1024 caption limit when the post has a photo/video. Read-only — nothing is saved, scheduled or published. Iterate on a new post with raw text (withMedia:true if it will carry images/video) until the operator approves it, then save it once with create_post_from_text; use it again before schedule_post so the operator sees exactly what goes out.