feat(registry): add html-in-canvas tag to all VFX and caption blocks

All 12 blocks now share the 'html-in-canvas' tag, enabling:

  hyperframes add --tag html-in-canvas

This installs all VFX + caption blocks in one command.

registry/blocks/vfx-iphone-device/registry-item.json

@@ -3,14 +3,22 @@
   "name": "vfx-iphone-device",
   "type": "hyperframes:block",
   "title": "iPhone & MacBook 3D Showcase",
-  "description": "Real GLTF iPhone 15 Pro Max and MacBook Pro models with live HTML-in-Canvas screen content, morphing glass lens, product review camera choreography, and 360° turntable.",
+  "description": "Real GLTF iPhone 15 Pro Max and MacBook Pro models with live HTML-in-Canvas screen content, morphing glass lens, product review camera choreography, and 360\u00b0 turntable.",
   "stability": "experimental",
   "dimensions": {
     "width": 1920,
     "height": 1080
   },
   "duration": 15,
-  "tags": ["vfx", "3d", "device", "iphone", "macbook", "gltf", "html-in-canvas"],
+  "tags": [
+    "html-in-canvas",
+    "vfx",
+    "3d",
+    "device",
+    "iphone",
+    "macbook",
+    "gltf"
+  ],
   "files": [
     {
       "path": "vfx-iphone-device.html",
@@ -38,4 +46,4 @@
       "type": "asset"
     }
   ]
-}
+}