Textarea

Input's shape and label behaviour for text that runs to more than one line. `limit` renders a `84 / 125` readout that shifts muted to warning at 90% and error past 100%, and deliberately leaves maxLength unset: a hard stop mid-word produces worse text than an overlong sentence. The readout is aria-hidden, because announcing a new number on every keystroke makes a field unusable with a screen reader, so pass `limitDescription` to state the target once through aria-describedby. `autoGrow` is off by default -- it is right for a field that owns its column and wrong inside a virtualised row, where every row must stay the same height. `counterTone` and `countCharacters` are exported so a count rendered elsewhere (a grid tile, a table row) matches the field instead of inventing a second set of thresholds.