This has the benefit of not adding `.preview` divs everywhere, anytime we use `parse()`, and also to un-tie the position of the preview blocks from the result of the helper. This means that templates that call `parse` and have some extra markup after that are not constrained anymore.
This is effectively an alternative, better way to fix https://github.com/thelounge/lounge/issues/1343, but the initial fix that was put in place (https://github.com/thelounge/lounge/pull/1347) is still relevant, for example to make sure a preview stays hidden (and does not add extra margin/padding/etc.) if the link does not prefetch.
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