Prepend a message after data invalidations

[ErickMwazonga]

When the user is taken back to the same step due to data invalidations. It should add an invalid message.

[njau58]

@ErickMwazonga Did you ever find a solution to this?

[ErickMwazonga]

@njau58, unfortunately, I did not.

[habbes]

You can use the defaultNext state to handle the case where the user enters invalid data. Then in that state you can display the invalid message. See: https://github.com/habbes/ussd-menu-builder?tab=readme-ov-file#defining-states