Scanned books are commonly distributed as DjVu, which the scanner only stored as a supplement.
Decode pages on the server with DjVuLibre so DjVu imports with a cover and page count, opens in
the image reader with its embedded OCR text, and can be the preferred format of an ordinary email
recipient. Migration 0113 widens the recipient format check to allow it.
Decoding runs on validated private snapshots behind a bounded, reader-first queue, and
revalidation and cached pages are answered without a decoder. Released iOS builds cannot open
DjVu, so series continuation offers it only to callers sending includeDjvu=true, and the
dashboard and notebook read file never name it. The first full scan after upgrading promotes
stored .djvu supplements to content.
Finishing an issue offered no way onward, so the next one had to be opened from the library.
Resolve the next readable book server-side with one keyset query, offer it on the last page, and
let an opt-in setting cross over on a further page turn. The reader route now remounts on a param
change, without which it would keep rendering the book it was mounted with.
Also cast the compared value in compareSeriesIndexSql: as a bare parameter Postgres could not type
it inside the null test and rejected the statement.
Closes#998
neon