Add shutdown watchdog for stalled Electron workers

[aleksandr-voitenko]

Adds a coordinated, bounded shutdown flow across Electron’s main process and worker renderer. The main process waits up to 10 seconds for acknowledgement, 30 seconds for worker teardown, and 10 seconds for Electron to exit after completion, force-exiting when a phase stalls.

Worker shutdown now persists local scene and session state before destructive OBS teardown, continues remaining steps after individual failures, bounds analytics flushing to three seconds, and reports whether shutdown completed cleanly. File flushing now supports concurrent shutdown callers and writes that race an in-flight flush.

If a second instance starts during shutdown, its arguments are preserved and one relaunch is scheduled; the active watchdog continues to bound the original process’s exit. Scene-collection cloud synchronization is deferred to startup so network stalls cannot block shutdown.

[bundlemon]

BundleMon

Files added (4)

Status	Path	Size	Limits
✅	renderer.(hash).js	+7.86MB	-
✅	vendors~renderer.(hash).js	+4.67MB	-
✅	updater.js	+115.29KB	-
✅	guest-api.js	+40.23KB	-

Total files change +12.68MB

Final result: ✅

View report in BundleMon website ➡️

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