Kibin 6fe6ebef13 feat: Sprint 5 — PIN lock, biometric auth, sync screen, QR code, merge logic ...

- lib/pinService.ts: PIN storage/verification via expo-secure-store
- lib/syncService.ts: sync abstraction with full merge logic (mDNS/TCP stubbed)
- app/lock.tsx: full-screen PIN lock with biometric support
- components/ui/PinPad.tsx: reusable 6-digit PIN pad component
- components/sync/QRScanner.tsx: QR code scanner via expo-camera
- app/(tabs)/sync.tsx: Sync tab with QR display, partner input, history
- app/sync-progress.tsx: animated sync progress screen with summary
- app/(tabs)/settings.tsx: full settings with PIN setup, security, data sections
- app/(tabs)/_layout.tsx: added Sync tab (RefreshCw icon)
- app/_layout.tsx: AppState listener locks app after 60s background
- package.json: added expo-secure-store, react-native-qrcode-svg

2026-02-18 19:57:35 +08:00

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