Add trigger on idle hook

[pawelphilipczyk-cloudinary]

Description

Added a better cleanup effect for the callback, regardless if it's a timeout or idle callback request.

Issue Ticket Number

Fixes #587

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Fix or improve the documentation
• This change requires a documentation update

Checklist

• I have followed the contributing guidelines of this project as mentioned in CONTRIBUTING.md
• I have created an issue ticket for this PR
• I have checked to ensure there aren't other open Pull Requests for the same update/change?
• I have performed a self-review of my own code
• I have run tests locally to ensure they all pass
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes needed to the documentation

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Name	Status	Preview	Updated (UTC)
next-cloudinary	✅ Ready (Inspect)	Visit Preview	Jun 5, 2025 7:06am

[eportis-cloudinary]

Testing this with @yawuxi ’s original reduced example in #587, I still end up with duplicate iframes. Digging into why...