fix: expand collapsible when isCollapsible intitialized with `true`

[ryanshepps]

Closes #485, closes #482

[MDSADABWASIM]

why it's still not merged?

[valerii-starlight]

@ryanshepps great catch, but one moment for RN:

WARN (ADVICE) "unset" is not a valid dimension. Dimensions must be a number, "auto", or a string suffixed with "%".

This works:

    const style = {
      overflow: 'hidden',
      height: hasKnownHeight ? height : undefined,
    };

[valerii-starlight]

@oblador Could you please merge it? 🙏