[Bug] Links in a video description can get misaligned

[lunasorcery]

Describe the bug

Links in a video description may start later in the text than they should, i.e. <a href="...">Click here!</a> to... may instead render as Cli<a href="...">ck here! to</a>.... This occurs most visibly when there are emojis in the description before the link.

From a quick skim of description.cr, it looks like Invidious counts the offset/length in codepoints, and I'm guessing YouTube might be counting in utf16 code units instead (where an emoji would be a surrogate pair and count for 2 instead of 1)

Steps to Reproduce

1. Open https://youtu.be/jjyesTkGNT4 in your instance of choice.
2. Scroll down to the description.
3. Observe that the clickable links start slightly later in the text than they should. For this video it's perhaps most obvious on the chapter markers.

Logs

Screenshots

Additional context

No response

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AI was not used to create this issue

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How was AI used?

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[TheFrenchGhosty]

Probably related to the fact that youtube renders some links (mostly social media) in a specific way now

[TheFrenchGhosty]

A 10$ bounty has been added to this issue.

Anyone opening a PR fixing this issue, will receive 10$ (in BTC) from the Invidious project.

More details: #1898