add setSelectedFileContent state

Author: Shreyas-Microsoft

src/frontend/src/pages/batchView.tsx

@@ -73,6 +73,7 @@ const BatchStoryPage = () => {
   const [selectedFileId, setSelectedFileId] = useState<string>("");
   const [expandedSections, setExpandedSections] = useState(["errors"]);
   const [batchSummary, setBatchSummary] = useState<BatchSummary | null>(null);
+  const [selectedFileContent, setSelectedFileContent] = useState<string>("");
   const [selectedFileTranslatedContent, setSelectedFileTranslatedContent] = useState<string>("");