feat(registry): add mk-background — minimal procedural gradient background

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

docs/catalog/blocks/mk-background.mdx

@@ -0,0 +1,44 @@
+---
+title: "Minimal Gradient Background"
+description: "Procedural soft-blob gradient backdrop in a minimalist presentation style: two radial blobs drifting over a base color, with an animatable rounded-card bar mask and optional frosted-glass mode"
+---
+
+# Minimal Gradient Background
+
+Procedural soft-blob gradient backdrop in a minimalist presentation style: two radial blobs drifting over a base color, with an animatable rounded-card bar mask and optional frosted-glass mode
+
+`background` `gradient` `minimal` `professional` `presentation`
+
+<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-background.mp4" poster="https://static.heygen.ai/hyperframes-oss/docs/images/catalog/blocks/mk-background.png" autoPlay muted loop playsInline />
+
+## Install
+
+<CodeGroup>
+
+```bash Terminal
+npx hyperframes add mk-background
+```
+
+</CodeGroup>
+
+## Details
+
+| Property | Value |
+| --- | --- |
+| Type | Block |
+| Dimensions | 1920×1080 |
+| Duration | 10s |
+
+## Files
+
+| File | Target | Type |
+| --- | --- | --- |
+| `mk-background.html` | `compositions/mk-background.html` | hyperframes:composition |
+
+## Usage
+
+After installing, add the block to your host composition:
+
+```html
+<div data-composition-id="mk-background" data-composition-src="compositions/mk-background.html" data-start="0" data-duration="10" data-track-index="1" data-width="1920" data-height="1080"></div>
+```