feat(registry): add lower thirds catalog blocks (#1134)

Adds news ticker from #1134, the podcast/interview lower-thirds pack from #1689,
and the BILD-style lower third from #1276.

Also adds generated catalog pages for flowchart-vertical and vfx-liquid-glass
from #1525, plus a Lower Thirds catalog group for discovery.

Co-authored-by: Miguel Ángel <miguel.sierra@heygen.com>
Co-authored-by: Kiyeon Jeon <kiyeonjeon21@users.noreply.github.com>
Co-authored-by: sunlesshalo <198846711+sunlesshalo@users.noreply.github.com>
Co-authored-by: Moritz <moritz.wedel@axelspringer.com>
Co-authored-by: Claude Sonnet <noreply@anthropic.com>
Co-authored-by: Dashsoap <42135402+Dashsoap@users.noreply.github.com>

registry/blocks/lower-third-bild/registry-item.json

@@ -0,0 +1,30 @@
+{
+  "$schema": "https://hyperframes.heygen.com/schema/registry-item.json",
+  "name": "lower-third-bild",
+  "type": "hyperframes:block",
+  "title": "Lower Third — BILD Style",
+  "description": "News-style lower third with tight-fit text boxes: white headline bar with red drop-shadow, red sub-line with white drop-shadow.",
+  "dimensions": {
+    "width": 1920,
+    "height": 1080
+  },
+  "duration": 8,
+  "tags": ["broadcast", "lower-third", "news", "overlay"],
+  "files": [
+    {
+      "path": "lower-third-bild.html",
+      "target": "compositions/lower-third-bild.html",
+      "type": "hyperframes:composition"
+    },
+    {
+      "path": "assets/fonts/BarlowCondensed-Bold.woff2",
+      "target": "compositions/assets/fonts/BarlowCondensed-Bold.woff2",
+      "type": "hyperframes:asset"
+    },
+    {
+      "path": "assets/fonts/BarlowCondensed-ExtraBold.woff2",
+      "target": "compositions/assets/fonts/BarlowCondensed-ExtraBold.woff2",
+      "type": "hyperframes:asset"
+    }
+  ]
+}