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Posts with math are very, very tall in the feed

With the recent post previews, posts with previewed math end up becoming ridiculously tall

<details><summary>Screenshot</summary>

![tall posts in post list](https://math.codidact.com/uploads/ugpdll036hphg5erqn8nkggwhhdb)

</details>

This obviously both looks ugly and means that fewer posts can fit on the page at once. There are two main ways that I think this could be resolved: forcing inline math display in previews or fixing the height and just cutting off the overflow. The latter being more consistent since it would be fixed height, though it might cut equations in half.