Add Genmoji support

What problem does this address?

Genmoji are available in every app, but they require a bit of work to render them as emoji. By default, these are inserted as images, which is not what you typically want.

Screenshots

Generation	Current Result

References:

• https://developer.apple.com/videos/play/wwdc2024/10220/
• https://developer.apple.com/documentation/uikit/nsadaptiveimageglyph

What is your proposed solution?

We should implement logic to render Genmoji as emoji characters.

// Converting NSAttributedString to HTML
let htmlData = try textContent.data(from: NSRange(location: 0, length: textContent.length),
documentAttributes: [.documentType: NSAttributedString.DocumentType.html])

<!-- Resulting HTML-->
<picture>
  <source srcset="genmoji.heic" type="image/x-apple-adaptive-glyph">
  <img src="genmoji.png" alt="dog in a spacesuit">
</picture>

Start with the NSAttributedString-to-HTML conversion shown in the issue and review Apple's NSAdaptiveImageGlyph documentation and WWDC reference. Determine how Genmoji adaptive image glyphs enter the generated HTML, then verify that they render as emoji characters rather than default images.