Add full cart functionality with API integration:
- Created Cart and OrderLineItem models with robust JSON parsing
- Implemented cart API methods (getOrCreateCart, setLineItem, getCart, submitOrder)
- Added cart state management to AppState with item count tracking
- Built cart view screen with item display, quantity editing, and removal
- Added cart badge to menu screen showing item count
- Implemented real add-to-cart logic with recursive modifier handling
- Added category name display in menu browsing
- Fixed API response case sensitivity (ORDER/ORDERLINEITEMS)
- Enhanced MenuItem model with categoryName field
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
- Add MenuItem model with hierarchical structure support
- Implement recursive menu browsing with infinite depth support
- Add ExpansionTile for collapsible modifier sections
- Implement radio/checkbox logic based on ItemMaxNumSelectionReq
- Add automatic pre-selection for ItemIsCheckedByDefault items
- Implement validation for ItemRequiresChildSelection and max limits
- Add recursive price calculation across all depth levels
- Support intelligent selection behavior (radio groups, parent/child deselection)
- Add proper error messaging for validation failures
- Connect menu items API endpoint
- Update navigation flow to menu browse after service point selection
- Add LoginScreen with form validation and error handling
- Add Api.login() method with LoginResponse model
- Add login route to AppRouter
- Update SplashScreen to check auth status and route to login if needed
- Store auth token in Api service for authenticated requests
- Fix restaurant selection to work with authenticated users
