- 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`
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