The sidecar process was orphaned when the Tauri app closed, leaving
ports 8080/8081 in use. On next launch the new sidecar couldn't bind
those ports and failed to start.
Added RunEvent::Exit handler that stops the sidecar before the app
process terminates.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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