When given an optional db handle, find_library_files queries
library_meta for templated filenames belonging to the post and
matches them alongside the legacy digit-stem stem == str(post_id)
heuristic. Without db it degrades to the legacy-only behavior, so
existing callers don't break — but every caller in the gui layer
has a Database instance and will be updated to pass it.
This is the foundation for the bookmark/browse saved-dot indicator
fix and the delete_from_library fix in the next three commits.
pax
6f59de0c64