test(vue-db): add type tests for findOne

[kevin-dp]

Add type tests reproducing issue #1095 where useLiveQuery with findOne() returns ComputedRef<Array<T>> instead of ComputedRef<T | undefined>.

This differs from the React implementation which correctly types findOne() queries to return a single object or undefined.

The tests currently fail, demonstrating the bug.

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• I have tested this code locally with pnpm test:pr.

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• This change is docs/CI/dev-only (no release).

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Latest commit: 9a2dc9b

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commit: 9a2dc9b

[github-actions]

Size Change: 0 B

Total Size: 90.5 kB

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Filename	Size
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Size Change: 0 B

Total Size: 3.47 kB

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Filename	Size
./packages/react-db/dist/esm/index.js	225 B
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