Expand input text area dynamically

Dynamically expand the size of Additional details text field to fit entered text so that no scrolling is needed until the maximum number of lines is reached. (i.e., make the box bigger X number of lines bigger, then add the scroll bar).

Start by locating the Additional details text field and its current input handling. Make the field grow with entered text until the configured maximum number of lines, then show scrolling; verify both growth and the maximum-size behavior manually.

Written by the indexing model from the issue text.