A cover with `data-duokan-page-fullscreen` on <html> renders in
paginated mode but is blank in scrolled mode; only the first cover is
affected, other images are fine in both modes.
The paginator's fullscreen branch pins such images with
position:absolute and height:100% and forces their ancestors to
height:100%. That fills the fixed-height page when columnized, but in
scrolled mode the container height is `auto`, so height:100% resolves
to 0 and the cover collapses out of view.
Bump foliate-js to gate the fullscreen treatment on column mode and
reset any stale absolute pinning when a fullscreen-cover doc is laid
out scrolled (so toggling paginated -> scrolled also recovers). Add a
browser regression test + repro-4379.epub fixture.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Huang Xin