feat: implement litter report form with multi-step wizard

- Create comprehensive ReportForm component with 4-step wizard
- Add progress indicator showing current step
- Implement litter type categorization with descriptions
- Add quantity estimation with visual indicators
- Include optional description textarea with character limit
- Create environmental concerns section with severity levels
- Integrate PhotoUpload and LocationSelector components
- Add form validation with error messages
- Implement review step showing all submitted data
- Update ReportFormPage to use new ReportForm component
- Create barrel export for report components

Requirements: 1.6, 1.7, 9.1, 9.2

src/components/report/index.ts

@@ -1,3 +1,4 @@
 export { PhotoUpload } from './PhotoUpload';
-export type { PhotoMetadata } from './PhotoUpload';
 export { LocationSelector } from './LocationSelector';
+export { ReportForm } from './ReportForm';
+export type { PhotoMetadata } from './PhotoUpload';