Switch mobile app to dark theme and fix calendar filtering
- Default to dark theme in mobile app, matching web app style
- Filter native calendar events by location to exclude empty ones
- Add batch edit panel for destinations on web calendar
- Add edit support to AddEventModal
- Update notification trigger input type export
- Introduce `getLeaveStatus` function in `packages/core/src/status-utils.ts` to determine leave-by status based on
journey data
- Mark Phase 1 mobile app tasks as complete in `CHECKLIST.md`
- Add mobile workspace configurations and npm scripts