feat: move compilation into component chunk code

[Myriad-Dreamin]

Previously, we run renderToHTMLish when transforming the module, this makes it hard to use methods on NodeTypstDocuments. I don't want to do too many things in this PR so I only move compilation into component chunk code and test that we can invoke doc.body() inside of the callback of createComponent.

new feature, a body prop to only render <body/> of html output:

// in [...slug].astro:
---
const Content = render();
---
<Content body={true}>

// in page.astro:
---
import Content from './about.typ?html';
---
<Content body={true}>

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Name	Status	Preview	Comments	Updated (UTC)
astro-typst	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 11, 2025 9:13am