feat: add new context to CLAUDE.md

CLAUDE.md

@@ -160,3 +160,62 @@ const handleFilterLocationChange = useCallback(
 
 - `SupplierTable`, `KandangsTable`, `LocationsTable`, `CustomersTable` in `src/components/pages/master-data/`
 - Use same pattern for data tables in other modules (inventory, finance, purchase, etc.)
+
+## Server-side file export pattern
+
+All file exports (Excel, PDF, or any format) must use **server-side generation** — the server returns a binary blob and the browser triggers a download. Never generate files client-side with `xlsx`, `@react-pdf/renderer`, `jspdf`, or similar libraries.
+
+**Rule:** Export methods live in the API service class, not in components. Components only build the query string and call the service method.
+
+### Service method (in `src/services/api/{feature}.ts`)
+
+```ts
+async exportToExcel(initialQueryString: string) {
+  const params = new URLSearchParams(initialQueryString);
+
+  params.set('export', 'excel'); // or 'pdf', 'csv', etc.
+  params.set('page', '1');
+  params.set('limit', '99999999999');
+
+  const res = await httpClient<Blob>(`${this.basePath}?${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', `filename-${formatDate(Date.now(), 'DD-MM-YYYY')}.xlsx`);
+  document.body.appendChild(link);
+  link.click();
+  link.remove();
+}
+```
+
+- Change `export=excel` → `export=pdf` (and the file extension) for PDF exports.
+- Add one method per format; keep them side-by-side in the same service class.
+
+### Component handler (in the page/tab component)
+
+```ts
+const handleExportExcel = useCallback(async () => {
+  setIsExcelExportLoading(true);
+  try {
+    const params = new URLSearchParams();
+    if (filterParams.foo) params.set('foo', filterParams.foo);
+    // ... map all active filter params ...
+
+    await FeatureApi.exportToExcel(params.toString());
+    toast.success('Excel berhasil dibuat dan diunduh.');
+  } catch {
+    toast.error('Gagal membuat Excel. Silakan coba lagi.');
+  } finally {
+    setIsExcelExportLoading(false);
+  }
+}, [filterParams, searchValue]);
+```
+
+- Do **not** fetch all rows into the component to build the file — delegate entirely to the service method.
+- Do **not** import `xlsx`, `@react-pdf/renderer`, `jspdf`, `exceljs` in page/tab components.
+
+**Reference implementation:** `MarketingReportApiService.exportDailyMarketingToExcel` / `exportDailyMarketingToPDF` in [src/services/api/report/marketing-report.ts](src/services/api/report/marketing-report.ts), consumed by [src/components/pages/report/marketing/tab/DailyMarketingTab.tsx](src/components/pages/report/marketing/tab/DailyMarketingTab.tsx).