Split landing hero into interactive webcam grid

- Move hero into its own client component
- Add webcam-backed pixel grid background
- Update landing wiring and content test coverage

components.json

@@ -12,6 +12,8 @@
   },
   "iconLibrary": "lucide",
   "rtl": false,
+  "menuColor": "default",
+  "menuAccent": "subtle",
   "aliases": {
     "components": "@/components",
     "utils": "@/lib/utils",
@@ -19,14 +21,13 @@
     "lib": "@/lib",
     "hooks": "@/hooks"
   },
-  "menuColor": "default",
-  "menuAccent": "subtle",
   "registries": {
     "@shadcnblocks": {
       "url": "https://shadcnblocks.com/r/{name}",
       "headers": {
         "Authorization": "Bearer ${SHADCNBLOCKS_API_KEY}"
       }
-    }
+    },
+    "@aceternity": "https://ui.aceternity.com/registry/{name}.json"
   }
 }