Add IPC close confirmation flow for Desktop

[benceruleanlu]

Summary

• Add IPC close-request/response so the main process asks the renderer whether to close
• Gate all close paths (window close, tray quit, IPC quit) through the confirmation flow
• Add timeout + sender validation for safety

Testing

• yarn format
• yarn lint
• yarn typecheck

Linked PRs

• Handle desktop close confirmation requests ComfyUI_frontend#8607

Fixes #1585

┆Issue is synchronized with this Notion page by Unito

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/close-confirmation-ipc

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