fix(scroll): #5995 keep computed height to avoid page jump

[ssan93]

Closes #5995

Issue When the iframe gets out of range, it unmounts to save memory. While scrolling on desktop widths (vertical layout), the iframes are unmounting and their height gets reduced. This causes page jump as the previous content gets shorter.

Solution By keeping the calculated height value of the iframe, we can set the height of the iframe wrapper to prevent shrinking and remove the page jumps.

https://github.com/user-attachments/assets/eccc0485-b989-443c-8aad-9c125f377cbf

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Size changes

📦 Next.js Bundle Analysis for react-dev

This analysis was generated by the Next.js Bundle Analysis action. 🤖

⚠️ Global Bundle Size Increased

Page	Size (compressed)
global	104.19 KB (🟡 +1 B)

Details

The global bundle is the javascript bundle that loads alongside every page. It is in its own category because its impact is much higher - an increase to its size means that every page on your website loads slower, and a decrease means every page loads faster.

Any third party scripts you have added directly to your app using the <script> tag are not accounted for in this analysis

If you want further insight into what is behind the changes, give @next/bundle-analyzer a try!