fix: recover zombie browser contexts during tab creation (#5416)

Bound new-page creation with a configurable 10-second deadline, replace only the affected user context on timeout/dead-context failures, and retry once.

Co-authored-by: Pradeep Elankumaran <pradeep@askjo.ai>

server.js

@@ -33,6 +33,7 @@ import {
 import { actionFromReq, classifyError } from './lib/request-utils.js';
 import { cleanupOrphanedTempFiles, cleanupStaleFirefoxProfiles } from './lib/tmp-cleanup.js';
 import { coalesceInflight } from './lib/inflight.js';
+import { createPageWithSessionRecovery } from './lib/new-page-recovery.js';
 import { createReporter, createTabHealthTracker, collectResourceSnapshot, classifyProxyError, browserProcessTreeRssMb, browserProcessNameRssMb } from './lib/reporter.js';
 import { mountDocs } from './lib/openapi.js';
 import { initSentry, captureException as sentryCaptureException, setupExpressErrorHandler as setupSentryErrorHandler, flush as sentryFlush } from './lib/sentry.js';
@@ -483,6 +484,7 @@ const MAX_SESSIONS = CONFIG.maxSessions;
 const MAX_TABS_PER_SESSION = CONFIG.maxTabsPerSession;
 const MAX_TABS_GLOBAL = CONFIG.maxTabsGlobal;
 const HANDLER_TIMEOUT_MS = CONFIG.handlerTimeoutMs;
+const NEW_PAGE_TIMEOUT_MS = CONFIG.newPageTimeoutMs;
 const MAX_CONCURRENT_PER_USER = CONFIG.maxConcurrentPerUser;
 const PAGE_CLOSE_TIMEOUT_MS = 5000;
 const NAVIGATE_TIMEOUT_MS = CONFIG.navigateTimeoutMs;
@@ -1313,6 +1315,23 @@ async function getSession(userId, { trace = false } = {}) {
   return session;
 }
 
+async function createPageWithRecoveryForUser(userId, session, { trace = false } = {}) {
+  const key = normalizeUserId(userId);
+  return createPageWithSessionRecovery({
+    userId: key,
+    session,
+    trace,
+    timeoutMs: NEW_PAGE_TIMEOUT_MS,
+    withTimeout,
+    isTimeoutError,
+    isDeadContextError,
+    currentSession: () => sessions.get(key),
+    destroySession,
+    getSession,
+    log,
+  });
+}
+
 function getTabGroup(session, listItemId) {
   let group = session.tabGroups.get(listItemId);
   if (!group) {
@@ -2726,9 +2745,11 @@ app.post('/tabs', async (req, res) => {
         }
       }
       
+      const createdPage = await createPageWithRecoveryForUser(userId, session, { trace: !!trace });
+      session = createdPage.session;
+      const page = createdPage.page;
       const group = getTabGroup(session, resolvedSessionKey);
-      
-      const page = await session.context.newPage();
+
       const tabId = fly.makeTabId();
       let tabState = createTabState(page);
       attachDownloadListener(tabState, tabId, log, pluginEvents, userId);