Making the auth panel a fixed height (to kill the scrollbar) left the
shorter views (login, reset) stranded at the top with dead space below.
Split panel_content into a main_column (header, message, mode views -
expand-fill, center-aligned) and the legal footer as a sibling that
stays pinned to the panel's bottom edge regardless of which view is
showing or how tall its content is.
Verified headlessly: top/bottom whitespace above and below the active
view's content is now equal (e.g. login 174/174, steam 2/2), and the
footer's position doesn't move between modes.
hz
854c887a1a