fix: persist source field in saveAnnotation so leaderboard counts Added

utils/storage.js

@@ -105,6 +105,7 @@ export async function saveAnnotation(annotation) {
     const datasetEntry = {
         dataset_name: annotation.dataset_name,
         dataset_tag: annotation.dataset_tag,
+        source: annotation.source || 'human',
         annotator: annotation.annotator,
         timestamp: annotation.timestamp,
         description: annotation.description || null,