feat: implement location selection interface with EXIF, GPS, and map picker

- Created LocationSelector component with three location input methods:
  * Auto-populate from photo EXIF data
  * Device GPS location capture with accuracy indicator
  * Interactive Leaflet map picker with draggable marker
- Added Ireland coordinate validation (lat: 51.4-55.4, lng: -10.5--5.5)
- Created coordinate utility functions for validation and formatting
- Added LocationSelectorDemo page for testing at /demo/location-selector
- Displays selected location with coordinates, source, and accuracy
- Provides clear error messages for validation failures
- Satisfies requirements 1.1, 1.2, 1.3, 8.2

src/pages/index.ts

@@ -4,3 +4,4 @@ export { ReportFormPage } from './ReportFormPage';
 export { EventsPage } from './EventsPage';
 export { AnalyticsPage } from './AnalyticsPage';
 export { PhotoUploadDemo } from './PhotoUploadDemo';
+export { default as LocationSelectorDemo } from './LocationSelectorDemo';