Fix CEF zombie processes on full app close and restart

[senamakel-droid]

Fix CEF zombie processes on full app close and restart

Extracts the early teardown logic into perform_early_teardown_sync and perform_early_teardown_async helpers, which ensure that child webviews, CDP tasks, and WebSockets are terminated before cef::shutdown() runs.
Previously, this only executed on RunEvent::ExitRequested. Now, it also runs on tray quit (shutdown_app_sync), restart_app, and app update restarts, preventing orphaned helper processes.

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PR created automatically by Jules for task 11257383111442119267 started by @senamakel-droid

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Note

Medium Risk
Changes app shutdown/restart sequencing (CEF/webview/core teardown) across multiple exit paths; mistakes could cause hangs, lost state, or failure to restart cleanly.

Overview
Ensures the same early teardown sequence runs before any app restart/exit, not just RunEvent::ExitRequested, to reduce orphaned CEF helper processes.

This extracts the cleanup steps into shared perform_early_teardown_sync/perform_early_teardown_async helpers and wires them into restart_app, app-update restarts (apply_app_update/install_app_update), and tray-menu Quit via a new shutdown_app_sync wrapper (replacing direct app.exit(0)).

Also bumps the openhuman crate version in Cargo.lock from 0.53.11 to 0.53.12.

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