electron-builder install-app-deps forks a child process via
remote-rebuild.js to run @electron/rebuild. The child's main()
has no .catch() handler, causing unhandled promise rejections
that exit with code 1 even after successful rebuilds.
Replace with direct `npx electron-rebuild` which runs in-process
and avoids the broken fork layer entirely.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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