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CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Development Commands
+
+### Essential Commands
+- `npm install` - Install dependencies
+- `npm start` - Start web development server (localhost:7474)
+- `npm run mobile-start` - Start React Native Metro bundler
+- `npm run android` - Run on Android (after metro is running)
+- `npm run ios` - Run on iOS (requires `cd ios && pod install && cd ..` first)
+- `npm run build` - Build for production web
+- `npm run lint` - Run ESLint and TypeScript type checking
+- `npm test` - Run Jest tests
+- `npm run clean` - Clean React Native project
+
+## Architecture Overview
+
+### Cross-Platform React Native App
+This is a React Native app with React Native Web support, enabling deployment to mobile (iOS/Android) and web from a single codebase.
+
+### Key Technologies
+- **React Native 0.77.2** with React Native Web
+- **TypeScript** with strict configuration and path aliases
+- **React Router** (react-router-dom for web, react-router-native for mobile)
+- **Styled Components** for styling
+- **i18next** for internationalization
+- **Webpack** for web bundling
+
+### Path Aliases (tsconfig.json)
+```
+@components → src/components
+@screens → src/screens
+@config → src/config
+@hooks → src/hooks
+@utils → src/utils
+@assets → src/assets
+@types → src/types
+```
+
+### App Structure
+- **Root.tsx** - Nested context providers (Theme, Modal, Hardware wallet contexts)
+- **App.tsx** - Main routing with React Router, error boundaries
+- **src/screens/** - Main app screens (Pos, Settings, Wallet, History, etc.)
+- **src/components/** - Reusable UI components with platform-specific variants
+- **src/config/** - Configuration (currencies, API URLs, Bitcoin settings)
+
+### Platform-Specific Files
+Components support platform-specific implementations:
+- `.tsx` - Shared
+- `.native.tsx` - Mobile only
+- `.ios.tsx` - iOS only
+- `.android.tsx` - Android only
+- `.web.tsx` - Web only
+
+### Bitcoin Payment App Features
+This is a Bitcoin point-of-sale application with:
+- Hardware wallet integration (Ledger, Trezor, Bitbox via context providers)
+- Bitcoin address validation and wallet derivation (BIP39/BIP84)
+- Lightning Network support
+- NFC/BoltCard payments
+- QR code scanning/generation
+- Non-custodial with auto-withdraw features
+
+### Error Handling & Security
+- Error boundaries with Sentry integration
+- SSL public key pinning
+- Biometric authentication
+- Encrypted storage
+- Screen recording prevention
+
+## Development Notes
+
+### Linting & Type Checking
+Always run `npm run lint` which includes both ESLint and TypeScript checking (`tsc --noemit`).
+
+### Mobile Development
+For mobile development, start Metro bundler first with `npm run mobile-start`, then run platform commands in separate terminals.
+
+### Hardware Wallet Development
+Context providers for hardware wallets are pre-configured in Root.tsx. Use these existing contexts when adding hardware wallet features.