Add shutdown watchdog for stalled Electron workers

[aleksandr-voitenko]

Summary

• Adds a Desktop main-process shutdown coordinator with the existing 10s worker-ack timeout plus a new 30s post-ack completion watchdog.
• Force-exits if a second instance launches while the first instance is stuck shutting down, releasing the single-instance lock.
• Wraps worker shutdown steps with logging and sends shutdownComplete from finally when teardown finishes or throws.
• More logs for better debugging

Tests

• Adds AVA coverage for ack timeout, completion timeout, completed shutdown, and second-instance shutdown behavior.

[bundlemon]

BundleMon

Files added (4)

Status	Path	Size	Limits
✅	renderer.(hash).js	+7.79MB	-
✅	vendors~renderer.(hash).js	+4.67MB	-
✅	updater.js	+115.29KB	-
✅	guest-api.js	+40.23KB	-

Total files change +12.6MB

Final result: ✅

View report in BundleMon website ➡️

---

Current branch size history