Fifth Phase 2 site migration. _copy_to_library_unsorted and
_copy_to_library now both delegate to a private
_save_bookmark_to_library helper that walks through save_post_file.
A small _bookmark_to_post adapter constructs a Post from a Bookmark
for the renderer — Bookmark already carries every field the renderer
reads, this is just one place to maintain if Post's shape drifts.
Fixes the latent v0.2.3 bug where bookmark→library copies wrote
files but never registered library_meta rows — those files were on
disk but invisible to Library tag-search until you also re-saved
from the browse side.
Picks up filename templates and sequential collision suffixes for
bookmark→library saves for free, same as the browse-side migrations.
Net add (+32 lines) is from the new helper docstrings + the explicit
_bookmark_to_post adapter; the actual save logic shrinks to a one-
liner per public method.
pax
d05a9cd368