chore: use parseCss from svelte/compiler

[manuel3108]

Closes #903
Draft, because i hate that we need to copy this omit everywhere. See thread in discord

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commit: 0bb41b3

[manuel3108]

Uses sveltejs/svelte#17654 for now. Should update to released version here once published. Way better now.

[manuel3108]

This is good to go now