Audit and fix accessibility in `QRScannerScreen.tsx` for VoiceOver / TalkBack users

[success-OG]

Labels: frontend accessibility

Background
src/screens/QRScannerScreen.tsx (11 KB) relies entirely on the camera viewfinder with no accessibility support. VoiceOver and TalkBack users cannot use the QR scanner at all — there is no alternative input method and no announcements when a code is detected.

What "Done" Looks Like

• Announce "QR code detected" via AccessibilityInfo.announceForAccessibility() when a scan succeeds
• Add a "Enter code manually" button as an alternative input for screen-reader users
• All interactive elements have accessibilityLabel and accessibilityRole
• Haptic feedback on successful scan (already available via Expo Haptics)
• Test with iOS VoiceOver and Android TalkBack (manual test notes required in PR)

[sadiqabubakar826-del]

@sadiqabubakar826-del has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

kindly assign this to me am active

ℹ️ Repo Maintainers: To accept this application, review their application or assign @sadiqabubakar826-del to this issue.

[nikkybel]

@nikkybel has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Please can I be assigned this issue?

ℹ️ Repo Maintainers: To accept this application, review their application or assign @nikkybel to this issue.

[drips-wave]

Congratulations, @nikkybel! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

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