A question shows in full up to three rendered lines and an option
description up to two. Longer copy keeps one line fewer, fades at the end
of that line, and offers a "More" text button that expands it in place;
expanded copy offers "Show less" on its own line.
CSS scroll timelines decide which copy overflows, so the composer no
longer measures layout in an effect. Each box keeps its full line budget
plus a 2px glyph allowance, and a negative margin returns the dropped
line, so the overflow reading never depends on the collapsed layout.
Navigation resets scroll and expansions from the navigation handler.
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