Refactor code structure and remove redundant changes

src-old/hooks/useEditHistory.ts

@@ -0,0 +1,17 @@
+import { useQuery } from '@tanstack/react-query';
+import { fetchEditHistory } from '@/lib/submissionItemsService';
+
+/**
+ * Phase 4: Hook to fetch edit history for a submission item
+ */
+export function useEditHistory(itemId: string | null) {
+  return useQuery({
+    queryKey: ['item-edit-history', itemId],
+    queryFn: () => {
+      if (!itemId) return [];
+      return fetchEditHistory(itemId);
+    },
+    enabled: !!itemId,
+    staleTime: 30000, // 30 seconds
+  });
+}