The bookshelf's save modal grows a second action: "Save as Collection"
POSTs the current (completed, scope-stamped) tree to
/api/collections — the same validated write path every tree
collection uses — and lands you on the new collection's page. The qf
engine then drives it everywhere: the shelf's live shelf-count, the
collections page, the replay chain for episode trees. The legacy
"Save Filter" (bookmark the wire params) stays as the sibling action.
This is the plan's bridge: a book search graduated into a live shelf
with one click, authored in the ONE filter system.
John O'Keefe
94bd69d22d