feat(svelte-db): Add findOne() / SingleResult support to useLiveQuery

[elohmeier]

Adds SingleResult support to useLiveQuery, matching the React implementation. When using .findOne(), data is typed as T | undefined instead of Array<T>.

Basically ports #440 to svelte-db.

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🦋 Changeset detected

Latest commit: 88ecc6c

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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@tanstack/svelte-db	Patch

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commit: 88ecc6c

[samwillis]

Thanks @elohmeier

[github-actions]

🎉 This PR has been released!

• @tanstack/svelte-db@0.1.60

Thank you for your contribution!