SSR broken after Svelte 5.39.0

[xtian]

sveltejs/svelte#16748 broke SSR for LiveSvelte, namely this change:

https://github.com/sveltejs/svelte/blob/e238e6611e1faddf19b57fc41e5e3eb930c04f22/packages/svelte/src/internal/server/renderer.js#L388-L405

I don't understand these internals well enough to know what the best approach would be for a fix. I can attempt a fix if I'm pointed in the right direction.

[joduffy]

@xtian take a look at my setup instructions as they might help:

#193