fix(registry): add pointer-events: none to caption component roots

Caption components are overlays — their root element should not
intercept pointer events, allowing clicks to pass through to the
underlying composition content in Studio.

registry/components/caption-kinetic-slam/caption-kinetic-slam.html

@@ -23,6 +23,7 @@
         background: transparent;
       }
       #kinetic-slam {
+        pointer-events: none;
         position: relative;
         width: 1920px;
         height: 1080px;