Description

Build a native mobile app using React Native (Expo) that provides the full Firevector experience optimized for field use. The @firevector/schema and @firevector/engine packages can be reused directly since they're pure TypeScript.

Proposed Architecture

apps/mobile/          (new Expo app)
├── package.json      (depends on @firevector/schema, @firevector/engine)
├── app/              (Expo Router file-based routing)
├── components/       (React Native components)
└── lib/              (API client, auth, offline storage)

Key Differences from Web

• Native GPS with background location updates
• Camera integration for photo documentation
• Push notifications for sync status
• Native offline storage (SQLite via expo-sqlite)
• Haptic feedback on LCES checklist completion

Shared Code

• @firevector/schema — types (100% reusable)
• @firevector/engine — calculations (100% reusable)
• Validation schemas — Zod works in React Native

New Code Needed

• React Native UI components (no shadcn — use Tamagui or NativeWind)
• API client for Next.js backend
• Native auth flow (expo-auth-session for Google OAuth)
• Push notification setup (expo-notifications)

Acceptance Criteria

• iOS and Android builds via Expo EAS
• Full observation CRUD
• Real-time calculations (same engine)
• GPS auto-location with native accuracy
• Offline-first with SQLite storage
• Google OAuth login
• Push notifications for sync
• App Store and Google Play ready

Phases

1. MVP: Observation form + dashboard (no map)
2. v2: Mapbox integration + offline tiles
3. v3: Camera, push notifications, background sync