feat(qr-pairing): add branch-coverage tests for qr-pairing.tsx

[d-oit]

Branch Coverage: qr-pairing.tsx (54.83% -> ~80% branches)

What

13 targeted tests covering key branches in the qr-pairing.tsx component.

Coverage Areas

Area	Tests
QRDisplay copy state	check icon after copy, 2s reset via fake timers
QRScanner startCamera	success path, Error rejection (message + toast), non-Error rejection (generic message)
QRScanner stopCamera	stop button click, unmount, unmount without stream
Barcode detection loop	barcode found calls onScan, no barcode reschedules RAF, detect reject reschedules, BarcodeDetector unavailable reschedules
onScanRef	updates on rerender (latest callback used)

Notes

• Mocks: qrcode.react, lucide-react, sonner, navigator.clipboard, navigator.mediaDevices, window.BarcodeDetector, requestAnimationFrame (spy capture), canvas getContext
• Cleanup in afterEach: RAF/getContext/play spies restored, mediaDevices + BarcodeDetector defineProperties cleaned up, fake timers reset

[vercel]

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Project	Deployment	Actions	Updated (UTC)
do-knowledge-studio	Ready	Preview, v0	Jul 31, 2026 10:07am

[codacy-production]

Up to standards ✅

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