Take the jvui that reads :active and keeps a field's text inside it

Two things the screenshot showed. The TLS tick was empty and clicking it
did nothing — not because the default was wrong, it has always been true,
but because the backend read :checked where frq and libvidya both write
:active, and fired :on-change where frq listens for :on-toggled. And a
handle typed into the field ran out past its border and over what was
beside it.

Both are prop-level, which is why the tag diff missed them: a tag being
handled is not the same as a tag reading the props a client writes.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>