[Vuejs]-Vue computed property do not send data to template

user_account/getUserDetailsSuccess sets state.user, but your computed prop does not return .user.

It should look like this:

export default {
  created() {
    this.$store.dispatch('user_account/getUserDetails')
  },
  computed: {
    currentUser() {
      // return this.$store.state.user_account ❌
      return this.$store.state.user_account.user
    },
  },
}

demo