Fix: Replace deprecated page.waitForTimeout with delay helper

- page.waitForTimeout() was removed in Puppeteer v19+
- Use custom delay() function with setTimeout instead
- Fixes 500 error when generating PDFs

server.js

@@ -6,6 +6,9 @@ const cors = require('cors');
 const app = express();
 const port = 7860;
 
+// Helper function for delay (replacement for deprecated page.waitForTimeout)
+const delay = (ms) => new Promise(resolve => setTimeout(resolve, ms));
+
 // Enable CORS for all origins (or restrict to gemini.google.com)
 app.use(cors());
 
@@ -66,7 +69,7 @@ app.post('/api/generate_pdf', async (req, res) => {
     
     // Wait for images to fully render (additional 3 seconds for base64 decoding)
     console.log('[PDF-GEN] Waiting for images to render...');
-    await page.waitForTimeout(3000);
+    await delay(3000);
     console.log('[PDF-GEN] Image render wait complete');
     
     // Count images in the rendered page
@@ -97,7 +100,7 @@ app.post('/api/generate_pdf', async (req, res) => {
     console.log('[PDF-GEN] Scroll complete');
     
     // Wait additional time for any lazy-loaded images
-    await page.waitForTimeout(2000);
+    await delay(2000);
 
     // Inject styles to ensure 100% width and print media simulation
     await page.addStyleTag({