f877e7e74c
Refactor lane preview finalization into explicit branches so stop-created previews never duplicate sends when edit fails. Add Telegram dispatch regressions for: - stop-created preview edit failure (no duplicate send) - existing preview edit failure (fallback send preserved) - missing message id after stop-created flush (fallback send) Thanks @obviyus for the original preview-prime direction in #27449. Co-authored-by: Ayaan Zaidi <hi@obviy.us>