Enable PDF footer with page numbers (1/N) and powered-by text

server.js

@@ -45,20 +45,29 @@ app.post('/api/generate_pdf', async (req, res) => {
     // Inject styles to ensure 100% width and print media simulation
     await page.addStyleTag({
         content: `
-            @page { margin: 10mm; size: A4; }
+            @page { margin: 0; size: A4; } /* Reset CSS page margin to let Puppeteer control it */
             body { -webkit-print-color-adjust: exact; }
         `
     });
 
-    // Generate PDF
+    // Generate PDF with Header/Footer
     const pdfBuffer = await page.pdf({
+      format: 'A4',
       printBackground: true,
-      preferCSSPageSize: true,
+      preferCSSPageSize: false, // Disable to ensure footerTemplate works
+      displayHeaderFooter: true,
+      headerTemplate: '<div></div>', // Empty header
+      footerTemplate: `
+        <div style="font-size: 8px; font-family: sans-serif; color: #888; width: 100%; text-align: center; padding-left: 10mm; padding-right: 10mm;">
+            <span style="margin-right: 10px;">Powered by XWX AI Chat Exporter</span>
+            <span><span class="pageNumber"></span> / <span class="totalPages"></span></span>
+        </div>
+      `,
       margin: {
-        top: 0,
-        bottom: 0,
-        left: 0,
-        right: 0
+        top: '10mm',
+        bottom: '20mm', // Space for footer
+        left: '10mm',
+        right: '10mm'
       }
     });