Fixed
- Authors tab empty after adding author (#339) — authors added via the UI or the AddBook implicit-create path were stored with
owner_user_id = NULLbecauseCreate()always calledCreateForUserwith a hardcoded zero. The Authors list query filters by the authenticated user's ID, so every freshly-added author was invisible in the tab even though it existed in the database. Both creation sites now pass the user ID from the request context, so authors are correctly owned and appear immediately.