DAISY audio-only lacks page number display (goto page navigation works, but ...)

[danielweck]

...current locator does not report nearest preceding page break, and no text rendering. This is because the DTBOOK-to-XHTML conversion actually starts from SMIL (not DTBOOK) with class="pagenum" attributes, but no obvious code path to extract epub:type="pagebreak" and the corresponding text from NCX PageList.