feat: harden relay sessions and recording UX across extension + playwriter

This commit batches the pending workspace updates that were coupled in practice: extension reliability fixes, ghost cursor persistence across MPA navigations, timeout tuning, and aligned docs/versioning updates so behavior and guidance stay in sync.

Key updates:\n- extension: add MV3 keepalive via chrome.alarms, add alarms permission, and bump extension changelog/version to 0.0.73 to reduce silent relay disconnects while idle\n- playwriter runtime: raise default action timeout to 60s while keeping navigation timeout separate; increase relay /version fetch timeout to 2000ms\n- recording + cursor: add persistent cursor init scripts with Page.addScriptToEvaluateOnNewDocument, remove init script on teardown, and ensure cursor enablement before applying mouse actions\n- demo video defaults: use 0.5s side buffer (1s total) and default idle speed 6x for createDemoVideo/computeIdleSections\n- tests/docs: keep click-error tests deterministic with explicit 5000ms per-click timeout, remove outdated click-timeout section from skill mistakes, and update package/changelog entries

extension/CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## 0.0.73
+
+### Bug Fixes
+
+- **Service worker keepalive via chrome.alarms**: Added `chrome.alarms` keepalive to prevent Chrome MV3 from terminating the service worker when idle. Without this, the `maintainLoop` stops, the WebSocket closes, and the extension silently disconnects from the relay server — causing `session new` to fail with "Extension did not connect within timeout."
+
 ## 0.0.72
 
 ### Bug Fixes

extension/manifest.json

@@ -1,9 +1,10 @@
 {
   "manifest_version": 3,
   "name": "Playwriter",
-  "version": "0.0.72",
+  "version": "0.0.73",
   "description": "Automate your Browser using Cursor, Claude, VS Code. More capable and context efficient than Playwright MCP.",
   "permissions": [
+    "alarms",
     "debugger",
     "tabGroups",
     "contextMenus",

extension/src/background.ts

@@ -1483,6 +1483,18 @@ async function onActionClicked(tab: chrome.tabs.Tab): Promise<void> {
 resetDebugger()
 connectionManager.maintainLoop()
 
+// MV3 service workers can be terminated by Chrome despite setInterval.
+// chrome.alarms is the only reliable way to keep a service worker alive.
+// Without this, the maintainLoop stops, the WebSocket closes, and the
+// extension silently disconnects from the relay server.
+chrome.alarms.create('keepalive', { periodInMinutes: 0.25 })
+chrome.alarms.onAlarm.addListener((alarm) => {
+  if (alarm.name === 'keepalive') {
+    // No-op — the alarm firing is enough to wake the service worker.
+    // The maintainLoop will handle reconnection if needed.
+  }
+})
+
 chrome.contextMenus
   .remove('playwriter-pin-element')
   .catch(() => {})