Add drag-and-drop upload component with chunked uploads and offline support

frontend/src/components/index.ts

@@ -10,3 +10,5 @@ export { FilterChip, FilterChipGroup } from './FilterChip';
 export { DataTable } from './DataTable';
 export { Pagination } from './Pagination';
 export { GlobalSearch } from './GlobalSearch';
+export { DragDropUpload } from './DragDropUpload';
+export type { DragDropUploadProps, UploadItem, UploadResult, UploadStatus } from './DragDropUpload';