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-weight-shift/caption-weight-shift.html

@@ -29,6 +29,7 @@
       }
 
       #weight-shift {
+        pointer-events: none;
         position: relative;
         width: 1920px;
         height: 1080px;