NavigationPage.qml mixed 0-based and 1-based numbering: the chapter list
showed the raw BookmarksModel index and the click handler subtracted one
more before positionViewAtIndex(), so every chapter was displayed and
opened one page early. Show pageIndex + 1 and pass pageIndex unchanged.
Also accept pageIndex >= 0 in PdfDocumentBookmarksLoadTask so bookmarks
to the first page are not dropped.

-Also the app version has been updated before release