Research: React Native + React selected for mobile and web

- Completed mobile-first platform strategy research
- React Native selected for iOS and Android mobile apps
- React selected for web companion app
- 70-80% code sharing between mobile and web
- Excellent health sensor integration (HealthKit, Health Connect)
- QR scanning, encryption, and background sync support
- Created comprehensive frontend research documentation
- Updated README with platform strategy
- Updated tech stack decisions

Key advantages:
- Single language (TypeScript) reduces development cost
- 70-80% code sharing between mobile and web
- Excellent health sensor integration
- Great chart visualization for web companion
- Faster time to market

Next: State management research (Redux vs Zustand)

README.md

@@ -11,22 +11,32 @@ To record as many variables related to health as possible, store them in a secur
 ## Technology Stack
 
 ### Backend
-- Framework: Axum 0.7.x
-- Runtime: Tokio 1.x
-- Middleware: Tower, Tower-HTTP
-- Database: MongoDB (with zero-knowledge encryption)
-- Language: Rust
+- **Framework**: Axum 0.7.x
+- **Runtime**: Tokio 1.x
+- **Middleware**: Tower, Tower-HTTP
+- **Database**: MongoDB (with zero-knowledge encryption)
+- **Language**: Rust
 
-### Frontend
-- TBD (Research in progress)
+### Mobile (iOS + Android)
+- **Framework**: React Native 0.73+
+- **Language**: TypeScript
+- **Health Sensors**: react-native-health, react-native-google-fit
+- **Encryption**: react-native-quick-crypto
 
-### Mobile
-- iOS: TBD
-- Android: TBD
+### Web
+- **Framework**: React 18+
+- **Language**: TypeScript
+- **Charts**: Recharts
 
 ### Deployment
 - Docker on Linux
 
+## Platform Strategy
+
+**Primary: Mobile Apps** - Daily health tracking, sensor integration, QR scanning, push notifications
+
+**Secondary: Web Browser** - Extensive reporting, visualization, profile management
+
 ## Key Features
 
 - Zero-knowledge encryption
@@ -34,7 +44,7 @@ To record as many variables related to health as possible, store them in a secur
 - Family structure management
 - Secure sharing with expiring links
 - Mobile apps with health sensor integration
-- Web interface
+- Web interface for complex visualizations
 
 ## Security Model
 
@@ -59,15 +69,17 @@ Phase: Planning/Documentation
 - Security architecture design
 - Encryption implementation guide
 - Git repository initialization
-- Rust framework selection: Axum
+- **Rust framework selection: Axum**
+- **Mobile/Web framework selection: React Native + React**
 
 ### Next Steps
-- Research frontend framework (React vs Vue vs Svelte)
-- Design authentication system (JWT with recovery phrases)
-- Design database schema
+- State management research (Redux vs Zustand)
+- Authentication system design (JWT with recovery phrases)
+- Database schema design
 - Create proof-of-concept with Axum
 - Implement basic CRUD API
-- Build web frontend
+- Build mobile apps with health sensor integration
+- Build web companion app
 - Add encryption layer
 - Implement sharing functionality