fix: memoize date range in AnalyticsDashboard to prevent infinite refetch

src/admin/analytics/AnalyticsDashboard.jsx

@@ -1,4 +1,4 @@
-import React, { useState } from 'react';
+import React, { useState, useMemo } from 'react';
 import { useAnalytics } from './useAnalytics';
 import FunnelChart from './charts/FunnelChart';
 import RevenueChart from './charts/RevenueChart';
@@ -33,7 +33,7 @@ const KpiCard = ({ label, value, sub }) => (
 
 const AnalyticsDashboard = () => {
   const [activeDays, setActiveDays] = useState(30);
-  const { from, to } = getRange(activeDays);
+  const { from, to } = useMemo(() => getRange(activeDays), [activeDays]);
   const {
     totalOrders, closedOrders, conversionRate,
     totalRevenue, avgDeal,