Add unit tests for the infinite scroll Intersection Observer hook

[Chucks1093]

Summary

The Intersection Observer hook that drives infinite scroll on the creator list has no unit tests. Tests should confirm the callback fires when the observed element enters the viewport and does not fire when it is out of view.

Scope

• Mock the Intersection Observer API in the test environment
• Test that the provided callback is called when the observed element becomes visible
• Test that the callback is not called when the element is not intersecting
• Test that the observer is disconnected when the hook unmounts
• Test that the observer is not created when enabled is false

Acceptance Criteria

• Callback fires on intersection
• Callback does not fire when not intersecting
• Observer disconnected on unmount
• Observer not created when enabled: false

ETA: 12 hours

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Coordinate on Telegram

[0xtrendz]

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[Dayz-tech-co]

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[lekanay2005-coder]

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pls i to work on this issue pls

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[wandooadzer-cmyk]

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Can I work on this task?

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@wandooadzer-cmyk's PR #610 was approved and merged by @Chucks1093.

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