Preview mode doesn't work with reactive state (only with the initState pattern)

[hugoattal]

I believe the failed test from my PR #88 are due to me updating the state from this pattern

function initState () {
  return {
    text: 'Hello',
    checkbox: false,
    number: 20,
    longText: 'Longer text...',
    select: 'crash-bandicoot',
  }
}

to this pattern

const state = reactive({
  text: 'Hello',
  checkbox: false,
  number: 20,
  longText: 'Longer text...',
  select: 'crash-bandicoot',
})

I've reverted this and the test now pass. Note that everything works fine in dev mode.

[Akryum]

With script setup you need to use defineExpose so that Histoire can access the state in production.