[josiahbergen]

Description

if the test page is taking a while to load some resource, it will show "Test page is still loading..." along with a small spinner. this message was not centered vertically!

the root cause is because the text's container (.pageTest) is a 1fr auto 1fr grid, and the text gets centered within the top row, not the whole container.

this change is a tiny class tweak that makes sure LoadingPage spans the whole thing. I got rid of h-full because it only made LoadingPage as tall as its grid row, and adding row-span-full makes it redundant.

here's a before/after comparison:

before

after

Checks

I couldn't find any pre-existing issues about this, and I used conventional commits + username in the commit message.

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