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Adds edit pages for items and partners — the two entities operators update most often. Each form loads the existing record, pre-fills all editable fields, and PATCHes on save. Code and baseUomCode are read-only after creation (by design). New pages: - EditItemPage: name, type, description, active toggle - EditPartnerPage: name, type, email, phone API client: catalog.updateItem, partners.update (PATCH). List pages: item/partner codes are now clickable links to the edit page instead of plain text. Routes wired at /items/:id/edit and /partners/:id/edit.
