Warn when reverting to original state (no actual changes)

src/App.tsx

@@ -473,6 +473,7 @@ export default function App() {
               {activeModule === 'history' && (
                 <HistoryView 
                   headers={appState.headers}
+                  data={appState.data}
                   onRevert={(articleNo, revertedData) => {
                     // Find the row in appState.data and update it
                     const rowIndex = appState.data.findIndex(r => String(r[COLUMNS.ARTICLE_NO]) === articleNo);

src/components/HistoryView.tsx

@@ -6,10 +6,11 @@ import { cn } from '../lib/utils';
 
 interface HistoryViewProps {
   headers: string[];
+  data: ExcelRow[];
   onRevert: (articleNo: string, oldData: ExcelRow) => void;
 }
 
-export function HistoryView({ headers, onRevert }: HistoryViewProps) {
+export function HistoryView({ headers, data, onRevert }: HistoryViewProps) {
   const [history, setHistory] = useState<HistoryEntry[]>([]);
   const [loading, setLoading] = useState(true);
   const [expandedId, setExpandedId] = useState<string | null>(null);
@@ -157,7 +158,15 @@ export function HistoryView({ headers, onRevert }: HistoryViewProps) {
                           onClick={(e) => {
                             e.stopPropagation();
                             if (window.confirm(`Are you sure you want to revert changes for ${entry.article_name}?`)) {
-                              onRevert(entry.product_id, entry.old_data);
+                              // Check if old_data equals current data in appState
+                              const currentRow = data.find(r => String(r[0]) === entry.product_id);
+                              if (currentRow && JSON.stringify(currentRow) === JSON.stringify(entry.old_data)) {
+                                if (window.confirm("Reverting will restore original data. No actual changes will be made. Continue?")) {
+                                  onRevert(entry.product_id, entry.old_data);
+                                }
+                              } else {
+                                onRevert(entry.product_id, entry.old_data);
+                              }
                             }
                           }}
                           className="flex items-center gap-1.5 px-3 py-1.5 rounded-md bg-orange-500/10 text-orange-400 hover:bg-orange-500/20 transition-colors border border-orange-500/20"