Reduce PDF margins: L/R 5mm, T/B 15mm

server.js

@@ -45,7 +45,7 @@ app.post('/api/generate_pdf', async (req, res) => {
     // Inject styles to ensure 100% width and print media simulation
     await page.addStyleTag({
         content: `
-            @page { margin: 20mm; size: A4; }
+            @page { margin: 0; size: A4; }
             body { -webkit-print-color-adjust: exact; }
         `
     });
@@ -55,10 +55,10 @@ app.post('/api/generate_pdf', async (req, res) => {
       format: 'A4',
       printBackground: true,
       margin: {
-        top: '20mm',
-        bottom: '20mm',
-        left: '10mm',
-        right: '10mm'
+        top: '15mm',
+        bottom: '15mm',
+        left: '5mm',
+        right: '5mm'
       }
     });