feat(registry): add mk-callout-highlight — word-sweep highlight

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/catalog/blocks/mk-callout-highlight.mdx

@@ -0,0 +1,44 @@
+---
+title: "Word-Sweep Highlight"
+description: "A sentence whose word-by-word emphasis is driven by a single scalar — tween it to sync the highlight with a voiceover"
+---
+
+# Word-Sweep Highlight
+
+A sentence whose word-by-word emphasis is driven by a single scalar — tween it to sync the highlight with a voiceover
+
+`typography` `karaoke` `captions` `minimal`
+
+<video className="w-full aspect-video rounded-xl object-cover bg-zinc-100 dark:bg-zinc-800" src="https://static.heygen.ai/hyperframes-oss/docs/images/catalog/blocks/mk-callout-highlight.mp4" poster="https://static.heygen.ai/hyperframes-oss/docs/images/catalog/blocks/mk-callout-highlight.png" autoPlay muted loop playsInline />
+
+## Install
+
+<CodeGroup>
+
+```bash Terminal
+npx hyperframes add mk-callout-highlight
+```
+
+</CodeGroup>
+
+## Details
+
+| Property | Value |
+| --- | --- |
+| Type | Block |
+| Dimensions | 1920×1080 |
+| Duration | 8s |
+
+## Files
+
+| File | Target | Type |
+| --- | --- | --- |
+| `mk-callout-highlight.html` | `compositions/mk-callout-highlight.html` | hyperframes:composition |
+
+## Usage
+
+After installing, add the block to your host composition:
+
+```html
+<div data-composition-id="mk-callout-highlight" data-composition-src="compositions/mk-callout-highlight.html" data-start="0" data-duration="8" data-track-index="1" data-width="1920" data-height="1080"></div>
+```