- Add 📷 scan button next to the barcode field in product form
Opens a camera modal (BarcodeDetector if available, manual fallback)
Detects barcode after 2 consistent frames, fills field and closes modal
- Show ⚠️ hint below the barcode field when it's empty (new products only):
'Aggiungi il barcode così al prossimo acquisto basta scansionarlo!'
Hint hides automatically when a code is entered or scanned
- Hint is hidden in edit-product mode (barcode already saved)
- scanBarcodeForForm() reuses the modal overlay; handles camera permission
errors gracefully (shows manual input only)
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