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
63d4dc3bb4