Refresh dashboard and statistics caches immediately after reading history,
projection, reset, import, and shared deletion changes. Coalesce bulk
notifications while keeping committed changes visible to concurrent reads,
and isolate listener failures from successful writes.
Skip unchanged Hardcover attempt updates and protect cache generations
against stale in-flight loads. Cover date edits, projection-only resumes,
rollback, bulk failures, user scope, and cache races with regression tests.
Ref #1695
Keep one cover slot per medium and show the one each surface needs: the
library's shape for the face, square art on audio screens, the ebook slot
for Kobo and OPDS. Legacy covers convert on upgrade or on first read, and a
write that names no slot keeps working for released iOS builds. Also read
the dev client origin from one constant.
Remove database records for books whose files are gone, clear cover
references with no file on disk, and delete cover folders left behind by
deleted books. Each category is reviewed in a paginated list and
re-verified against disk before anything is removed.
Closes#312
neon