Daniel Bedeleanu da83c91a5b feat: add side-by-side item comparison for duplicate Part Numbers ...

New Component: ItemComparisonModal.tsx
- Shows existing vs new item side-by-side
- Highlights fields that are different (in yellow)
- Options to Update item or Skip (local-only save)
- Shows existing item ID and comparison details

Backend Changes:
- Updated error message to say 'Part Number' not 'barcode'
- 409 response includes existing item data for comparison
- Clear, user-friendly conflict messaging

Frontend Changes:
- New state for comparison modal (newItem, existingItem, existingId)
- handleOnboardingComplete() shows modal on 409 conflict
- handleComparisonUpdate() calls updateItem() API
- handleComparisonSkip() saves locally without syncing
- Better error handling distinguishes 409 from other failures

Workflow:
1. User imports item with Part Number that already exists
2. System shows comparison modal
3. User can:
   - Update (merges new data into existing)
   - Skip (saves locally, doesn't sync to cloud)

2026-04-17 12:35:42 +03:00

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