Fix job details popover sticking after cancel/delete

[benceruleanlu]

Summary

• close the job details popover when its job disappears or timers fire after list changes, and clear hover timers on unmount
• emit an explicit details-leave on cancel/delete clicks so the popover closes even if hover-out never fires

Fixes https://github.com/Comfy-Org/ComfyUI_frontend/issues/6907

Testing

• pnpm typecheck
• pnpm lint:fix

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