POST/PUT/DELETE for items: create mints the itemcode from the
configured prefix plus the flushed row id, update refuses
quantityonhand (ledger-managed - restock/adjust arrive next stage),
delete soft-retires. The image upload/serve/delete trio replicates the
models.py pattern into instance/printedpartsimages/ with a public GET.
PrintedItemDetail follows the unified detail skeleton (hero photo,
info list, transaction history table); PrintedItemForm covers
create/edit plus photo management on edit.
GET /items (paginated, search across code/name/description/bin,
lowstock filter) and GET /items/<id> with recent transactions, both
open reads. printedpartsApi client, router file repointed at the
renamed views, PrintedItemsList with image thumbs and a red/green
quantity badge against the per-item threshold. Nav entry '3D Parts'
with a new 'box' Lucide icon mapping (the sidebar renders nothing for
unknown icon names - lab gotcha).
