chore: derive the render output type from svelte/server

[Nic-Polumeyv]

render_response types rendered with a hand-written { head, body, hashes: { script: string[] } } and a TODO asking svelte/server to expose RenderOutput. The file already imports render, so the type is reachable today, and the hand-written version had drifted from it (hashes.script is `sha256-${string}`[]).

Omit because SyncRenderOutput still carries the deprecated html, which neither assignment site sets.

[pkg-svelte-dev]

Install the latest version of @sveltejs/kit from 7df5485:

pnpm add https://pkg.svelte.dev/@sveltejs/kit/c/7df54856423dcb49c1797af53ba46530a6a4bef0

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/kit/pr/16821

[changeset-bot]

⚠️ No Changeset found

Latest commit: 7df5485

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[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-kit-16821-svelte.vercel.app/

[Rich-Harris]

Reinstated the comment as we should still get around to that. Opened sveltejs/svelte#18660