[WIP] Update obs-studio-node to v0.27.19cefsand3

[summeroff]

Summary

• pin Desktop's native obs-studio-node package to 0.27.19cefsand3
• use the package built from Host sandboxed CEF 6613 subprocesses in obs64 obs-studio-node#1781 at 8ac5d69a, with libobs 32.1.1sl12cef4 from Enable the Windows CEF sandbox and update x64 to CEF 6613 obs-studio#775
• carry CEF 6613 revision 3, whose libcef.dll has the sandbox interface layout expected by its packaged sandbox library
• add local browser-source workload fixtures and regular/stress tests for startup, page activity, refresh, repeated launches, scene cycling, and soak
• use Desktop's existing HADisable profile setting for these Windows test suites by default, with SLOBS_TEST_ENABLE_ELECTRON_HA=1 to reproduce the accelerated Electron path; production settings are unaffected

Package validation

• Windows archive: https://s3-us-west-2.amazonaws.com/obsstudionodes3.streamlabs.com/osn-0.27.19cefsand3-release-win64.tar.gz
• size: 326,574,496 bytes
• SHA-256: C81C97D442693189399EF75056257C40F377771A04D1FB5159D119026F4A90AD
• the archive lists successfully and contains obs_studio_client.node, obs-browser.dll, and libcef.dll
• packaged libcef.dll SHA-256: 0DE0B267B38AE1FC613AFE8ECA7EEAB59B950DDA4F1EEFA6B30DFC40A1A8A6EE, matching the CEF revision-3 manifest
• macOS packages: x86_64 and arm64; both publish jobs passed and both URLs return HTTP 200

Desktop validation

• On Windows, the regular streamer workload test completed chat, alerts, goals, Canvas, and network activity and passed its shutdown hook with SLOBS_TEST_DISABLE_ELECTRON_HA=1 before the suite default was changed.
• With SLOBS_TEST_ENABLE_ELECTRON_HA=1, those workload assertions passed, but the shutdown hook timed out again. A retained dump showed Electron 43.7.6 waiting for a synchronous GPU channel response during VizProcessTransportFactory teardown after worker and OSN shutdown completed.
• On Windows, the regular streamer workload test passed all chat, alerts, goals, Canvas, and network checks plus the shutdown hook with the new default profile setting and no acceleration environment override.
• yarn tsc -p test --noEmit, node --check main.js, node --check on the fixture scripts, yarn eslint main.js, and git diff --check passed for the test changes.

Pending validation

• run the WebGL and repeated-launch stress tests, Desktop CI, and restricted-token/job-object plus Crashpad checks in the complete Desktop stack

[bundlemon]

BundleMon

Files added (4)

Status	Path	Size	Limits
✅	renderer.(hash).js	+10.86MB	-
✅	vendors~renderer.(hash).js	+4.66MB	-
✅	updater.js	+115.29KB	-
✅	guest-api.js	+40.23KB	-

Total files change +15.67MB

Final result: ✅

View report in BundleMon website ➡️

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Current branch size history