- Implemented packages section for item details in `packages-section.svelte`
- Created summary section to display general data and weights in `summary-section.svelte`
- Developed tab continuation for additional item details in `tab-continuation.svelte`
- Added identifiers tab for managing item identifiers in `tab-identifiers.svelte`
- Introduced labeling tab for item labeling information in `tab-labeling.svelte`
- Created serial numbers tab for entering multiple serial numbers in `tab-series.svelte`
- Built item sheet for inventory items in `item-sheet-inv.svelte`
- Developed items tab form for managing invoice items in `items-tab-form.svelte`
- Renamed customs-related schemas in line_items to LineCustomCreate, LineCustomUpdate, and LineCustomResponse.
- Adjusted models to streamline invoice_id mapping in Item model.
- Enhanced item routes to include company_id in summary statistics endpoint.
- Refactored ItemService to improve item creation and update logic, removing redundant methods.
- Updated frontend components for item management, including new item creation and editing functionalities.
- Added API client for items with CRUD operations and improved error handling.
- Implemented the items tab form in Svelte for editing invoices, displaying item quantities and import values.
- Created saveInvoice function to handle both creation and updating of invoices, including validation of required fields and building a unified payload for API requests.
- Added support for compliance, financials, and logistics data in the invoice payload.
