Fail release QA on runtime errors

scripts/verify-release-candidate.mjs

@@ -17,9 +17,21 @@ try {
   browser = await chromium.launch({ headless: true });
   const page = await browser.newPage({ viewport: { width: 1280, height: 720 } });
   const consoleMessages = [];
+  const pageErrors = [];
+  const requestFailures = [];
   page.on('console', (message) => {
     consoleMessages.push({ type: message.type(), text: message.text() });
   });
+  page.on('pageerror', (error) => {
+    pageErrors.push(error.message);
+  });
+  page.on('requestfailed', (request) => {
+    requestFailures.push({
+      url: request.url(),
+      type: request.resourceType(),
+      failure: request.failure()?.errorText ?? 'unknown'
+    });
+  });
 
   await page.goto(targetUrl, { waitUntil: 'domcontentloaded' });
   await page.evaluate(() => window.localStorage.clear());
@@ -168,7 +180,10 @@ try {
   );
 
   const errors = consoleMessages.filter((message) => message.type === 'error');
+  const blockingRequestFailures = requestFailures.filter((request) => request.failure !== 'net::ERR_ABORTED');
   assert(errors.length === 0, `Unexpected browser console errors: ${JSON.stringify(errors)}`);
+  assert(pageErrors.length === 0, `Unexpected browser runtime errors: ${JSON.stringify(pageErrors)}`);
+  assert(blockingRequestFailures.length === 0, `Unexpected browser request failures: ${JSON.stringify(blockingRequestFailures)}`);
 
   console.log(`Verified release-candidate user flow at ${targetUrl}`);
 } finally {