fix: validation updates now saved at top level, not nested in dataset_name

human_validated, human_verdict, annotator, validated_at were being
incorrectly merged into dataset_name sub-object instead of the
dataset entry's top level. This caused verified count to never update.

app/api/validate/route.js

@@ -64,14 +64,14 @@ export async function PUT(request) {
             return NextResponse.json({ error: `Dataset index ${dataset_index} out of range` }, { status: 400 });
         }
 
-        // Merge updates into dataset_name (same level as judge_ fields)
+        // Merge updates into the dataset entry.
+        // Fields like dataset_tag go at top level.
+        // Fields like human_validated, human_verdict, annotator, validated_at go at top level.
+        // Only dataset_name sub-fields (text, confidence, etc.) go inside dataset_name.
         const currentEntry = pagesData[pageIdx].datasets[dataset_index];
         pagesData[pageIdx].datasets[dataset_index] = {
             ...currentEntry,
-            dataset_name: {
-                ...currentEntry.dataset_name,
-                ...updates,
-            },
+            ...updates,
         };
 
         // Save back