fix: use _rawIndex for delete/validate to avoid index mismatch after filtering

The UI filters out consensus non-datasets, shifting display indices.
Now _rawIndex (original position in the unfiltered array) is used for
all API calls, so the correct entry gets deleted/validated.

app/components/AnnotationPanel.js

@@ -31,7 +31,7 @@ export default function AnnotationPanel({
     };
 
     const submitValidation = (ds, idx, verdict) => {
-        onValidate(idx, {
+        onValidate(ds._rawIndex ?? idx, {
             human_validated: true,
             human_verdict: verdict,
             human_notes: validationNotes.trim() || null,
@@ -48,7 +48,7 @@ export default function AnnotationPanel({
     };
 
     const saveEditTag = (ds, idx) => {
-        onValidate(idx, { dataset_tag: editTag });
+        onValidate(ds._rawIndex ?? idx, { dataset_tag: editTag });
         setEditingTagIdx(null);
         setEditTag('');
     };

app/page.js

@@ -266,9 +266,10 @@ export default function Home() {
 
     // Delete dataset entry by index
     const handleDeleteAnnotation = async (ds, idx) => {
+        const rawIdx = ds._rawIndex ?? idx;
         try {
             const res = await fetch(
-                `/api/validate?doc=${selectedDocIndex}&page=${currentPageNumber}&idx=${idx}`,
+                `/api/validate?doc=${selectedDocIndex}&page=${currentPageNumber}&idx=${rawIdx}`,
                 { method: 'DELETE' }
             );
             if (res.ok) {
@@ -310,14 +311,16 @@ export default function Home() {
         }
     };
 
-    // All datasets on the current page, excluding consensus non-datasets
-    // (model says non-dataset AND judge agrees)
-    const currentPageDatasets = (currentPageData?.datasets || []).filter(ds => {
-        if (ds.dataset_tag === 'non-dataset' && ds.dataset_name?.judge_agrees === true) {
-            return false; // both model and judge say non-dataset → skip
-        }
-        return true;
-    });
+    // All datasets on the current page, excluding consensus non-datasets.
+    // Preserve _rawIndex so delete/validate use the correct position in the file.
+    const currentPageDatasets = (currentPageData?.datasets || [])
+        .map((ds, i) => ({ ...ds, _rawIndex: i }))
+        .filter(ds => {
+            if (ds.dataset_tag === 'non-dataset' && ds.dataset_name?.judge_agrees === true) {
+                return false;
+            }
+            return true;
+        });
 
     // Validate a dataset entry (approve/reject with notes)
     const handleValidateDataset = async (datasetIdx, updates) => {