fix: stronger types for the autocomplete attribute

[fcrozatier]

The attribute value is either the keyword off or on, or a space-separated <token-list> that describes the meaning of the autocompletion value.

https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/autocomplete#values

Svelte 5 rewrite

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• It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
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• Ideally, include a test that fails without this PR but passes with it.

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[changeset-bot]

🦋 Changeset detected

Latest commit: 1be3cc0

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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svelte	Patch

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[dummdidumm]

Thank you!

[pooledge]

What happened to nickname?