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iOS Safari (and the in-app webviews in Messages / WhatsApp / LinkedIn) don't ship the BarcodeDetector API, so the previous scanner fell through to the manual paste UI on every iPhone — defeating the point of "tap to scan." Vendored cozmo/jsQR (Apache 2.0, ~250KB) and made the scanner pick the strongest available decoder at setup time: 1. native BarcodeDetector -> Android Chrome, iOS Safari 17+, desktop 2. jsQR canvas loop -> every other browser with getUserMedia 3. manual URL paste -> last-resort if camera unavailable The jsQR loop draws each video frame into an offscreen canvas, downsamples to 480px on the long side, and runs jsQR synchronously throttled to ~8 fps to stay under 10% CPU on mid-range Android phones. Template now shows the <video> element whenever ANY decoder is available (state.canScan), not just for native. Paste fallback still visible as a secondary path so a tablet with broken camera permissions still has a way in. shopfloor: 19.0.16.0.0 -> 19.0.17.0.0 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>