fix: type RenderHookOptions.wrapper with preact ComponentChildren

[akselinurmio]

Summary

Fixes #81.

RenderHookOptions.wrapper was typed as ComponentType<{ children: Element }>. Here Element resolves to the DOM Element global rather than a preact/JSX type, so a normal wrapper component (context providers, etc.) typed with ComponentChildren / PropsWithChildren is not assignable, producing a TS2322 error at every renderHook call that passes a wrapper.

This changes the type to ComponentType<{ children?: ComponentChildren }>, using preact's ComponentChildren and making children optional, matching how wrapper components are actually typed.

Changes

• Import ComponentChildren from preact.
• wrapper?: ComponentType<{ children: Element }> → wrapper?: ComponentType<{ children?: ComponentChildren }>.

Testing

• npm test — 13 suites / 104 tests pass.
• npm run build — CJS + ESM compile successfully.

The change is type-only; no runtime code changed.