FileXfer is now the active Muq-facing bridge that supplants SendFile for current transfer work. The old SendFile remains retired-compatible, but active Muq transfer no longer needs Tell luqin/luqout. Mode: .
Uses the SendFile Cutter anatomy as a guide while adopting the newer Bootstrap/CSS look.
LoadInfo, SaveInfo, and Browse remain the key actions.
Message, Caption, File, and Sharing are represented in the new worker layout.
Collapsed single-level parent/default handling stays in place.