- AccountingController::export(): new headers (Numer | Data wystawienia | Kwota brutto | Kwota netto | Stawka VAT | Kwota VAT), removed Data sprzedazy/Konfiguracja/Nr zamowienia/Nr referencyjny
- buildVatBreakdown() helper groups items_json by vat rate, emits one XLSX row per (receipt x rate); legacy receipts (no `vat` in snapshot) fallback to net=brutto/1.23
- ReceiptService::buildItemsSnapshot(): writes `vat` per item from order_items.tax_rate (fallback 23.0); shipping cost item gets vat=23.0
- RECEIPT-NET-FIX deferred (.paul/codebase/todo.md): ReceiptService::issue() still saves total_net=total_gross
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Jacek Pyziak
0227f2d072