Add mobile services, web proxy, and Gemma4 agent loop

- Mobile: add push notification and calendar sync services with full test suite (calendar, eventStore, notifications,
  screens)
- Mobile: add EAS build config and Jest setup
- Web: add API proxy, update useDestinationStation/useJourneys hooks, add middleware tests
- Web: update next.config and rebuild
- Agent: add Gemma4-based agent loop (agent_base, ttl_agent, ts_agent)
- Docs: add privacy policy, post-MVP plan, and aider rules

POST_MVP_PLAN.md

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+# TimeToLeave - Post-MVP Improvements Plan
+
+## High Priority
+
+### 1. Native Calendar Import
+- Integrate with expo-calendar or react-native-calendar-events
+- Request calendar permissions
+- Auto-sync events from Google/Apple calendars
+- Support multiple calendar sources
+
+### 2. Push Notifications
+- Implement FCM for Android and APNs for iOS
+- Server-side notification triggers for journey changes
+- Real-time updates when train status changes
+- Fallback to local notifications when offline
+
+### 3. Offline-First Architecture
+- Use expo-sqlite for local caching
+- Cache journey data for offline access
+- Background sync when connection restored
+- Conflict resolution for concurrent edits
+
+## Medium Priority
+
+### 4. Real Map Integration
+- Integrate expo-maps for visual route display
+- Show train stations on map
+- Display bike route with turn-by-turn directions
+- Alternative route suggestions
+
+### 5. Multiple Origins Support
+- Allow different origins per event
+- Home/Work/Custom origin presets
+- Quick origin switching in event detail
+
+### 6. Auto-Refresh
+- Refresh journey data when returning to app
+- Background refresh for active events
+- Configurable refresh intervals
+
+## Lower Priority
+
+### 7. Accessibility
+- TalkBack/VoiceOver support
+- Dynamic type scaling
+- High contrast mode
+- Screen reader optimizations
+
+### 8. Theming
+- Dark mode support
+- System theme following
+- Custom color schemes
+- Accessibility-compliant color contrasts
+
+### 9. Analytics & Crash Reporting
+- Sentry or similar for error tracking
+- Usage analytics (opt-in)
+- Performance monitoring
+- User feedback collection
+
+### 10. Advanced Features
+- Shared events with friends/family
+- Recurring event templates
+- Journey history and statistics
+- Export/import event data
+
+## Technical Debt
+
+### 11. Code Quality
+- More comprehensive test coverage
+- E2E tests for critical flows
+- Performance optimization
+- Bundle size reduction
+
+### 12. Documentation
+- User documentation
+- API documentation
+- Contributing guidelines
+- Architecture decisions (ADRs)