foliate's goLeft/goRight (and spread ordering) swap on book.dir ===
"rtl", but makeComicBook never sets dir, so manga/comic archives
always paged left-to-right even when the metadata says right-to-left.
For fixed-layout content, set this.book.dir = "rtl" from the
readingDirection metadata after the book opens. Reflowable EPUBs are
unaffected: they keep whatever direction foliate read from the OPF.
This is scoped to isFixedLayout (FXL EPUB, PDF, comics) so it cannot
reach the reflowable path.
john-okeefe
caaf27427e