On macOS, Cmd+Q triggers ExitRequested before Exit. If the app is
force-quit or closed via Cmd+Q, the Exit event may not fire,
leaving the sidecar process orphaned with ports 8080/8081 in use.
Now handles both ExitRequested and Exit to ensure the sidecar is
always stopped when the app closes.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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