fix: use robust date parsing utility to handle varying n8n date formats

src/dataService.ts

@@ -52,3 +52,20 @@ export const fetchData = async (): Promise<OrderData[]> => {
         return [];
     }
 };
+
+export const parseOrderDate = (dateStr: string): Date => {
+  if (!dateStr) return new Date(0);
+  if (dateStr.includes('T')) return new Date(dateStr);
+  const parts = dateStr.split(/[-/]/);
+  if (parts.length === 3) {
+    if (parts[0].length === 4) {
+      // YYYY-MM-DD
+      return new Date(Number(parts[0]), Number(parts[1]) - 1, Number(parts[2]));
+    } else {
+      // DD-MM-YYYY
+      return new Date(Number(parts[2]), Number(parts[1]) - 1, Number(parts[0]));
+    }
+  }
+  const fallback = new Date(dateStr);
+  return isNaN(fallback.getTime()) ? new Date(0) : fallback;
+};