v0.2.5

Fixed

• A book the metadata match moved onto a series shelf kept its cover but
  lost its blurb and year: they had been written to the standalone shelf it
  left behind, which was then pruned. They now travel with the book, and a
  series shelf takes the first book's blurb and year until it has its own.
  The file's rows follow the book as well, so it no longer shows as
  "available on demand" — not yet downloaded — when it is on disk.
• An on-demand book that had been fetched to disk still counted as not yet
  downloaded ("available on demand"): the fetch recorded where the file
  landed but never told the file index. It is owned from the moment it lands.

Added

• Add a book. The app's Add button gains a Books tab where a Books
  library exists: search the catalog, see what is already on the shelf, and
  add a book — it goes on a wanted list and the download sources are asked
  for it at once (by ISBN where the catalog has one). What no source has yet
  is tried again by the new Fill wanted books job, or leaves the list
  when a scan or import brings it in. GET /api/ebooks/wanted lists the
  wanted books; DELETE /api/ebooks/wanted/<id> drops one.
• Downloads are filed. A book the app's download sources fetched (an
  approved request, for instance) is moved into the library as
  Author/Series/Title.ext and catalogued like a scanned one, named from the
  request's title and author. Needs app 0.8.4 or later; older apps simply
  never hand anything over.
• Removing an on-demand source's entries. DELETE /api/ebooks/remote/<source>
  (library manage) drops every file-less entry that source put on the shelf,
  with their issues and the series left empty, and forgets its sync cursor —
  for a source plugin you have removed, or a shelf you want reset. A book it
  had already fetched to a file stays, as an ordinary local book.