feat(registry): mk / yt / hw theme families — 29 items

Adds three themed registry families contributed by @jbernard077:

- mk-*  minimal presentation  (7 blocks, 3 components)
- yt-*  retro-broadcast creator (5 blocks, 4 components)
- hw-*  hand-drawn scribble   (6 blocks, 5 components)

Consolidates PRs #1933, #1992, #1993 and #1994, cuts 5 of the original 34
items, and fixes the defects that CI never got to report.

Cut (5), each covered by something we already ship or trivial to inline:
- yt-doc-lower-third — would be the 12th name/role lower third next to the
  10 lt-* variants and lower-third-bild
- mk-logo-sting — logo-outro exists, and yt-logo-intro is the richer version
- mk-cta-button, mk-pill-callout, yt-avatar-pip — a styled button, a styled
  chip and a masked circle

Fixes:
- hw-path-text rendered as a solid black blob. #hw-pt-path is the textPath
  carrier and had no rule, so it inherited SVG's default black fill while
  only #hw-pt-guide set fill:none.
- mk-line-graph value labels collided with their own dots and each other.
  Series after the first now label downward, and the offset moved off a CSS
  transform because the entrance tween animates y and GSAP rewrote it.
- Added demo.html for the 11 components and the 3 transparent-root blocks.
  Without it generate-catalog-previews.ts skips components entirely, so the
  catalog-previews job failed for every component in the original PRs.
- Tagged hw-title, hw-pipeline and hw-path-text as overlays.

Also registers all catalog pages in docs.json, which the original PRs left
orphaned, and picks up 4 pre-existing blocks that had no catalog page
(camcorder-hud, editorial-flash-overlay, freeze-frame-dressing,
organic-light-leak-overlay) because the regenerated nav now links them.

Every item was verified by rendering it and looking at the frames.

Co-authored-by: jbernard077 <jbernard077@users.noreply.github.com>

docs/catalog/blocks/hw-pipeline.mdx

@@ -7,7 +7,7 @@ description: "Wobbled boxes with handwritten labels joined by curved connectors,
 
 Wobbled boxes with handwritten labels joined by curved connectors, drawing on in sequence from a node list
 
-`handwritten` `diagram` `data-viz`
+`handwritten` `diagram` `data-viz` `overlay`
 
 <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/hw-pipeline.mp4" poster="https://static.heygen.ai/hyperframes-oss/docs/images/catalog/blocks/hw-pipeline.png" autoPlay muted loop playsInline />
 
@@ -34,6 +34,7 @@ npx hyperframes add hw-pipeline
 | File | Target | Type |
 | --- | --- | --- |
 | `hw-pipeline.html` | `compositions/hw-pipeline.html` | hyperframes:composition |
+| `assets/fonts/Caveat-700-latin.woff2` | `assets/fonts/Caveat-700-latin.woff2` | hyperframes:asset |
 
 ## Usage