feat: add Excel export to BalanceMonitoringTab

Add exportBalanceMonitoringToExcel to FinanceApiService (server-side
blob download hitting reports/balance-monitoring?export=excel). Wire it
into BalanceMonitoringTab via a Dropdown export button in the tab
actions. Wrap the handler in useCallback to prevent an infinite
setTabActions loop caused by a new function reference on every render.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/pages/report/finance/tab/BalanceMonitoringTab.tsx

@@ -1,6 +1,6 @@
 'use client';
 
-import { useState, useMemo, useEffect } from 'react';
+import { useState, useMemo, useEffect, useCallback } from 'react';
 import useSWR from 'swr';
 import { Icon } from '@iconify/react';
 import { useFormik } from 'formik';
@@ -24,6 +24,7 @@ import { BalanceMonitoringRow } from '@/types/api/report/balance-monitoring';
 import { CustomerPaymentRow } from '@/types/api/report/customer-payment';
 import Modal, { useModal } from '@/components/Modal';
 import Button from '@/components/Button';
+import Dropdown from '@/components/Dropdown';
 import DateInput from '@/components/input/DateInput';
 import Table from '@/components/Table';
 import CustomerSupplierSkeleton from '@/components/pages/report/finance/skeleton/CustomerSupplierSkeleton';
@@ -40,6 +41,7 @@ const filterByOptions: OptionType<string>[] = [
 const BalanceMonitoringTab = ({ tabId }: BalanceMonitoringTabProps) => {
   const [hasDateError, setHasDateError] = useState(false);
   const [dateErrorShown, setDateErrorShown] = useState(false);
+  const [isExcelExportLoading, setIsExcelExportLoading] = useState(false);
 
   const filterModal = useModal();
 
@@ -230,6 +232,33 @@ const BalanceMonitoringTab = ({ tabId }: BalanceMonitoringTabProps) => {
       ? balanceMonitoringsResponse.meta
       : null;
 
+  const handleExportExcel = useCallback(async () => {
+    setIsExcelExportLoading(true);
+    try {
+      const customer_ids =
+        tableFilterState.customers.length > 0
+          ? tableFilterState.customers.map((o) => String(o.value)).join(',')
+          : undefined;
+      const sales_ids =
+        tableFilterState.salesPersons.length > 0
+          ? tableFilterState.salesPersons.map((o) => String(o.value)).join(',')
+          : undefined;
+
+      await FinanceApi.exportBalanceMonitoringToExcel(
+        customer_ids,
+        sales_ids,
+        tableFilterState.filterBy?.value,
+        tableFilterState.start_date || undefined,
+        tableFilterState.end_date || undefined
+      );
+      toast.success('Excel berhasil dibuat dan diunduh.');
+    } catch {
+      toast.error('Gagal membuat Excel. Silakan coba lagi.');
+    } finally {
+      setIsExcelExportLoading(false);
+    }
+  }, [tableFilterState]);
+
   // Inject tab actions directly — no nested component, no remount cycle
   useEffect(() => {
     setTabActions(
@@ -248,9 +277,55 @@ const BalanceMonitoringTab = ({ tabId }: BalanceMonitoringTabProps) => {
           variant='outline'
           className='px-3 py-2.5'
         />
+
+        <Dropdown
+          align='end'
+          direction='bottom'
+          className={{
+            content:
+              'mt-1 rounded-xl border border-base-content/5 shadow-sm overflow-hidden',
+          }}
+          trigger={
+            <Button
+              variant='outline'
+              color='none'
+              isLoading={isExcelExportLoading}
+              className='px-3 py-2.5 text-sm text-base-content/50 border border-base-content/10 rounded-xl shadow-button-soft'
+            >
+              <div className='flex flex-row items-center gap-1.5'>
+                <Icon
+                  icon='heroicons:cloud-arrow-down'
+                  width={20}
+                  height={20}
+                />
+                <span>Export</span>
+                <div className='w-px self-stretch bg-base-content/10' />
+                <Icon icon='heroicons:chevron-down' width={14} height={14} />
+              </div>
+            </Button>
+          }
+        >
+          <Button
+            variant='ghost'
+            color='none'
+            onClick={handleExportExcel}
+            isLoading={isExcelExportLoading}
+            className='w-full p-3 justify-start text-sm text-base-content/50 font-semibold text-nowrap'
+          >
+            <Icon icon='heroicons:table-cells' width={20} height={20} />
+            Ekspor ke Excel
+          </Button>
+        </Dropdown>
       </div>
     );
-  }, [tabId, setTabActions, tableFilterState, filterModal.openModal]);
+  }, [
+    tabId,
+    setTabActions,
+    tableFilterState,
+    filterModal.openModal,
+    isExcelExportLoading,
+    handleExportExcel,
+  ]);
 
   useEffect(() => {
     return () => clearTabActions(tabId);

src/services/api/report/finance-report.ts

@@ -86,6 +86,40 @@ export class FinanceApiService extends BaseApiService<
     link.remove();
   }
 
+  async exportBalanceMonitoringToExcel(
+    customer_ids?: string,
+    sales_ids?: string,
+    filter_by?: string,
+    start_date?: string,
+    end_date?: string
+  ) {
+    const params = new URLSearchParams();
+    if (customer_ids) params.set('customer_ids', customer_ids);
+    if (sales_ids) params.set('sales_ids', sales_ids);
+    if (filter_by) params.set('filter_by', filter_by);
+    if (start_date) params.set('start_date', start_date);
+    if (end_date) params.set('end_date', end_date);
+    params.set('export', 'excel');
+    params.set('page', '1');
+    params.set('limit', '9999999999');
+
+    const res = await httpClient<Blob>(
+      `${this.basePath}/balance-monitoring?${params.toString()}`,
+      { method: 'GET', responseType: 'blob' }
+    );
+
+    const url = window.URL.createObjectURL(new Blob([res]));
+    const link = document.createElement('a');
+    link.href = url;
+    link.setAttribute(
+      'download',
+      `laporan-balance-monitoring-${formatDate(Date.now(), 'DD-MM-YYYY')}.xlsx`
+    );
+    document.body.appendChild(link);
+    link.click();
+    link.remove();
+  }
+
   async getBalanceMonitoringReport(params: {
     start_date?: string;
     end_date?: string;