Brave ships with the File System Access API off, so a save is a download and
the browser's dialog cannot hand a changed name back: the bytes must be built
in the format chosen beforehand, or a renamed file carries the other format.
One entry per format settles that on every route, the DOCX export entry goes
as its duplicate, and the DOM run covers the download route.
Chrome's macOS save panel shows no format popup and admits only the first
picker type's extensions, so a second type could never be chosen there. Both
extensions now share one type, for documents and templates alike, and the
typed extension decides what is written. A document without a file saves
through that same picker, and the Save entry no longer names .odt.
The picker lists .odt and .docx, and the chosen extension decides which
exporter runs and which format the document keeps — no silent switch to
.odt for a file that came in as .docx. Both save paths now build their
bytes through one helper instead of repeating the argument list.
Steffen Becker