Fix the server and web gaps found while porting the PDF and comic
readers and offline downloads to Android, checked against the iOS app:
- KOReader: answer a pull for a PDF or comic with the page number when a
BookOrbit client wrote last, instead of a percentage with no page
- comics: key the zip offset, RAR and CB7 caches by file id and
modification time, so pages are not served from stale offsets after a
metadata write-back rewrites the archive
- comics: answer an unreadable archive with 422 rather than a page count
of 0, and extract CB7 with its folders so same-named pages in
different folders no longer overwrite each other
- book files: send an ETag and Last-Modified on serve and download and
honour If-None-Match and If-Range, clamp a range that runs past the
end, answer suffix ranges with 206, and honour Range on download,
which advertised it but sent the whole file
- book files: leave raw file routes uncompressed, so FB2 and unknown
formats keep their Content-Length
- progress: reject a fractional or negative page number with 400 rather
than failing with 500 at the database
- types: declare the comic page-count response shared by the web and
the apps
- web: open a percentage-only PDF position at its estimated page, and
flush pending PDF and comic progress before the reading session ends
neon
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