- PdfReader renders PDFs to canvas with page navigation and page-number
progress, reusing the same integer progress model as comics.
- Reader routes by file container, not media kind, so a PDF in a comics
library and a PDF ebook both open in the PDF reader.
- pdf.js is dynamically imported: the main bundle stays 443 kB and the 474 kB
pdf chunk plus 1.26 MB worker load only when a PDF is actually opened.
- comics cover extractor now only handles zip archives. A PDF in a comics
library is a valid item but not a zip, so it returns no cover instead of
logging an error on every request.
- fixed the page scale to leave slack for the vertical scrollbar, which was
otherwise forcing a horizontal scrollbar on tall pages.
Verified live: a 3-page PDF renders, navigates, and reports 33% progress.
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