feat: implement photo upload component with EXIF extraction

- Add PhotoUpload component with drag-and-drop interface
- Integrate exifr library for GPS and timestamp extraction
- Implement file validation (type, size)
- Add photo previews with metadata overlay
- Support multiple photo uploads (max 5 files, 5MB each)
- Display GPS indicators and extracted metadata
- Create demo page for testing component
- Satisfies requirements 1.2, 1.3, 1.4, 1.5, 8.3

src/pages/index.ts

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