Recompute the open file digest and recover previously verified matches without guessing between duplicate files. Preserve stranded statistics across lifecycle retries and advertise plugin version 1.5.3 so installed devices can update.
Fixes#1497
Clearing a book's progress deleted the shared row and left the KOReader device row behind, so
the next pull served the deleted position straight back. Clearing that row too is not enough
either: an empty response reads as "this server knows nothing about your book", which is the
one reply that leaves a device certain its own sidecar is the only position there is, and it
pushes that back on the next sync.
Record the reset as a durable fact and answer the pull with a real start position attributed to
BookOrbit. Route the position by format, because KOReader's own kosync plugin feeds it straight
to GotoPage or GotoXPointer with no percentage fallback and an empty value leaves the reader
where it was. Stamp each delivery as current, because both clients compare that against their
last page turn and default backward syncs to disabled, so the original reset time would be
dropped on any pull deferred past a page turn without ever prompting.
Serving a reset proves nothing, since either client can classify it as a backward sync and drop
it silently, so the marker survives delivery and a device is held until its own push reports the
start. Retire it once a device that took the reset reads on: the pull carries no device
identity, so a marker kept alive past its purpose is answered to every device and would send
that one back to the start on every sync. The bound this leaves is deliberate. A second device
that never took the reset is protected only until the first reads on, and closing that needs
device_id on the pull, which is a plugin change.
Judge convergence on the reported position rather than the percentage, so page 1 of a hundred
page comic is not mistaken for a position no short book could ever reach. Wind Kobo bookmarks
back through the same paths, since a Kobo device otherwise resumes from its own bookmark and
reports it back the same way.
Closes#1032
neon