- Add ShelfBarcodeScanScreen: scans barcode via mobile_scanner, looks up
product via GET /products/barcode/{barcode} (Open Food Facts fallback),
returns CatalogProduct to caller; loading overlay while looking up;
"Add manually" fallback in AppBar for unknown products
- Extract AddToShelfSheet to add_to_shelf_sheet.dart (was private in
product_search_screen.dart) so both search and scan screens can reuse it
- Add barcode icon button to ProductSearchScreen AppBar → opens scanner
- Add "Scan barcode" card (📷) to ScanScreen alongside receipt and photo modes
- Rename ScanScreen title: addFromReceiptOrPhoto → scanScreenTitle
("Сканировать" / "Scan & Recognize") to reflect all three modes
- Add 2 L10n keys (scanScreenTitle, barcodeScanSubtitle) across all 12 locales
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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