fix: raise Puppeteer timeouts to 120s for 99-page illustrated book

Default 30s is too short when loading and rendering many local images.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/pdf.js

@@ -97,7 +97,11 @@ async function generate() {
   });
   const page = await browser.newPage();
 
-  await page.goto(`file://${inputPath}`, { waitUntil: 'networkidle0' });
+  // Large illustrated books with many local images need generous timeouts
+  page.setDefaultNavigationTimeout(120_000);
+  page.setDefaultTimeout(120_000);
+
+  await page.goto(`file://${inputPath}`, { waitUntil: 'networkidle0', timeout: 120_000 });
 
   // Write to temp file first so Ghostscript can read it
   await page.pdf({
@@ -106,6 +110,7 @@ async function generate() {
     height: '8.75in',
     printBackground: true,
     margin: { top: 0, bottom: 0, left: 0, right: 0 },
+    timeout: 120_000,
   });
 
   await browser.close();