Add CI pipeline, pre-commit hooks, and offline caching

Configure GitHub Actions for linting, typechecking, and testing.
Add Husky and lint-staged for pre-commit checks. Implement API
response caching in AsyncStorage for offline support. Move core
tests to packages/core and add vitest configuration.

POST_MVP_PLAN.md

@@ -1,79 +1,87 @@
 # TimeToLeave - Post-MVP Improvements Plan
 
+> **Last updated:** 2026-05-19
+> This plan reflects the current state of the codebase after the initial MVP and mobile rewrite.
+
+## Already Implemented (No Longer TODO)
+
+The following items from earlier versions of this plan have been completed and are in production:
+
+- **Native Calendar Import** — `expo-calendar` integration with device calendar sync, permission requests, and multiple calendar source selection.
+- **Push / Local Notifications** — `expo-notifications` with local notification scheduling. Server-side push (FCM/APNs) for live journey updates remains deferred.
+- **Dark / Light Theming** — System theme following and manual dark/light toggle on both web and mobile.
+- **Auto-Refresh** — `useFocusEffect`-based refresh on mobile when returning to foreground.
+
+---
+
 ## 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
+### 1. Offline-First Architecture
+- Cache journey and route data in `AsyncStorage` / `localStorage` for offline viewing.
+- Background sync when connection is restored.
+- Add explicit "offline mode" UI indicators.
+- Conflict resolution for concurrent event edits.
 
-### 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
+### 2. Real Map Integration
+- Integrate `expo-maps` / `@vis.gl/react-google-maps` for visual route display.
+- Show origin, destination, and train stations on a map.
+- Display bike route with turn-by-turn directions.
+- Alternative route suggestions (e.g., faster vs. fewer changes).
 
-### 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
+### 3. Multiple Origins Support
+- Allow different origins per event (Home, Work, Custom presets).
+- Quick origin switching in event detail and settings.
+- Store origin presets in persistent settings.
+
+---
 
 ## 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
+### 4. Server-Side Push Notifications
+- Implement FCM for Android and APNs for iOS for real-time journey disruption alerts.
+- Real-time delay/cancellation push notifications.
+- Fallback to local notifications when the server is unreachable.
 
-### 5. Multiple Origins Support
-- Allow different origins per event
-- Home/Work/Custom origin presets
-- Quick origin switching in event detail
+### 5. Accessibility
+- TalkBack / VoiceOver screen reader support on mobile.
+- Dynamic type scaling.
+- High contrast mode.
+- WCAG 2.1 AA compliance audit on web.
 
-### 6. Auto-Refresh
-- Refresh journey data when returning to app
-- Background refresh for active events
-- Configurable refresh intervals
+### 6. Analytics & Crash Reporting
+- Integrate Sentry for error tracking on web and mobile.
+- Opt-in usage analytics.
+- Performance monitoring (Web Vitals, React Native startup time).
+- In-app user feedback collection.
+
+---
 
 ## Lower Priority
 
-### 7. Accessibility
-- TalkBack/VoiceOver support
-- Dynamic type scaling
-- High contrast mode
-- Screen reader optimizations
+### 7. Advanced Features
+- Shared events with friends / family (collaborative departure planning).
+- Recurring event templates.
+- Journey history and statistics dashboard.
+- Export / import event data (ICS, JSON).
 
-### 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
+## Technical Debt & Quality
 
-### 10. Advanced Features
-- Shared events with friends/family
-- Recurring event templates
-- Journey history and statistics
-- Export/import event data
+### 8. Code Quality
+- Extract shared hooks to `packages/hooks` (deduplicate web and mobile hook implementations).
+- Increase unit test coverage across all packages.
+- Add Playwright E2E tests for web critical flows.
+- Add Detox E2E tests for mobile critical flows.
+- Bundle size analysis and reduction.
 
-## Technical Debt
+### 9. Developer Experience
+- Consolidate ESLint to Flat Config everywhere.
+- Add pre-commit hooks (`husky` + `lint-staged`).
+- Add GitHub Actions CI pipeline.
+- Architecture Decision Records (ADRs) in `docs/adr/`.
 
-### 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)
+### 10. Documentation
+- Keep `POST_MVP_PLAN.md` and `CHECKLIST.md` in sync with reality.
+- Contributing guidelines (`CONTRIBUTING.md`).
+- API versioning policy once the backend grows.