Removal is a soft delete and nothing on screen said so. GetLibrary() filters
!IsDeleted, so a trashed book leaves the grid, the search index and every status
count at once, with no indication it still exists. In #1925 a purchased book sat
in the trash for a week while the reporter and I looked everywhere else for it.
Add a status bar segment reading '29 in trash' that opens the trash bin when
clicked, and put the same count on the Settings > Trash Bin menu item. Both hide
themselves when the trash is empty, which is the normal case and says nothing
worth screen space.
The count is a separate query rather than part of LibraryStats: GetCounts also
runs against the visible subset on every filter change, where a database round
trip would be wasted work. GetLibraryBookCountsByTrashFlag already existed and
counts rows without loading entities. Refreshed on LibrarySizeChanged, which
both removal and restore already fire, and after the trash bin dialog closes.
Wording lives in LibationUiBase.TrashBinUi so Avalonia and WinForms agree.
Co-authored-by: rmcrackan <rmcrackan@gmail.com>
