feat: implement report submission and display (task 9)

- Created reportService for API interactions (upload, create, get, verify, dispute)
- Built ReportDetailModal component with photo gallery and verification UI
- Updated ReportForm with actual API submission and progress tracking
- Added error handling and success states
- Created ReportDetailDemo page to showcase modal functionality
- Added route for demo page at /demo/report-detail
- Exported services through index file for cleaner imports
- Documented implementation in SUBMISSION_IMPLEMENTATION.md

Requirements fulfilled: 1.8, 7.4

src/pages/index.ts

@@ -5,3 +5,4 @@ export { EventsPage } from './EventsPage';
 export { AnalyticsPage } from './AnalyticsPage';
 export { PhotoUploadDemo } from './PhotoUploadDemo';
 export { default as LocationSelectorDemo } from './LocationSelectorDemo';
+export { ReportDetailDemo } from './ReportDetailDemo';