QR scanning:
- Run BarcodeDetector and jsQR in parallel — jsQR starts after JSQR_DELAY_MS
(1.5 s) so both decode simultaneously. BarcodeDetector silently returns empty
arrays for some QR variants; running jsQR in parallel via a separate rAF loop
(rafId2) and its own off-screen canvas catches those cases. First decoder to
find anything calls handleQrResult and sets qrFound = true; the other stops.
Price extraction (two bugs):
- ScanLabel: unitPrice was catalogMatch?.UnitPrice ?? 0m, ignoring aiResult
.UnitCostPerLb entirely when no catalog match — changed to fall through to AI result
- AppendOffer: only read JSON-LD "price" field; Shopify AggregateOffer uses
"lowPrice" instead — now checked as fallback so Prismatic Powders prices are found
Camera pre-warm:
- Reverted localStorage approach (caused getUserMedia to fire on every page load,
showing Chrome's "Ask" prompt immediately before user clicked anything)
- Restored Permissions API gate: preWarmCamera only calls getUserMedia when
navigator.permissions.query returns 'granted', never risks a page-load prompt
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
spouliot
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