Cover all scenarios for FileSelectBox.

Include storybook previews for all components.

Ensure packages can be standalone.

Add consistent behavior for numberspinner.

Use fallback ID hook instead of defining verbose React hooks.

Make UX as seamless as possible.

Add default value handling for phonenumberinput.

Put proxy hook into react-utils.

Properly handle events for focus, blur, and change.

Start separating trivial components to their own categories outside the
kitchen sink package.