The move to Sveltekit broke the 'card info during review' add-on and
its descendants. This didn't get noticed in 24.11 due to the old
card-info.js file still being shipped.
I considered adding back the card-info.js generation, but it ended up
being simpler to move parts of the add-on into a separate page instead.
This is a stop-gap solution - in the future I'd like to get us to a
point where such component compositions can be done by add-ons,
and don't need to be done as part of Anki's build process.
Related: #3187
