Refactor layout border visibility

[Sqrrl]

Storybook

The CSS-only solution wasn't working reliably within Flip Web, unfortunately. The scroll state sometimes wasn't updated correctly when content changed dynamically, and there were some "glitches" when used in combination with sticky elements.

So, back to the JS solution.

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2 Skipped Deployments

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **getflipdev** | ⬜️ Ignored ([Inspect](https://vercel.com/getflip/getflipdev/5jXbxiGEyJePBgV5YkuM8H8a29T4)) | [Visit Preview](https://getflipdev-git-layout-borders-via-js-getflip.vercel.app) | | Sep 11, 2024 0:17am | | **staginggetflipdev** | ⬜️ Ignored ([Inspect](https://vercel.com/getflip/staginggetflipdev/34qbdiAp57hBzTC9DiHFsbd6VkHP)) | [Visit Preview](https://staginggetflipdev-git-layout-borders-via-js-getflip.vercel.app) | | Sep 11, 2024 0:17am |

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