form.field.Text: styling for invalid values

currently, form.fields are using a DOM level based pseudo selector to mark the validity.

this needs to change, e.g. in case we create a form for creating a new entity, we most likely want the fields to look "clean" => no "red borders" (error indicators).

as a first step, we should remove the DOM based selector rules and use the neo neo-invalid rule instead.

this will apply a border on the wrapperEl in case this exists => same level as the active border.

for now, i think the active state should have a prio compared to errors (a bit like validate on blur), but this could be optional (follow up ticket).