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/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;