- Introduced a new `handleQtyChange` function to manage per-row quantity updates for both customer and stock items, ensuring correct data submission to the appropriate endpoints.
- Enhanced the `dedupeAttachments` function to handle additional document sources, including parent purchase orders, and skip empty filenames to prevent 404 errors.
- Updated the `ItemsTable` and `PoCard` components to support quantity editing, allowing users to modify collected quantities directly in the UI.
- Added tests to validate the new quantity handling logic and attachment deduplication, ensuring robust functionality across various scenarios.
