A collapsed question or description keeps its full line budget and only
masked its dropped line, so that transparent line still took clicks: it
covered the first line of the question detail and the top edge of the
custom answer row. clip-path now removes the line from hit testing as
well as from view, and Web e2e hit tests pin both targets.
Expansions also record the question they belong to and apply only while
that question is shown, so a position change from another surface of the
same Session no longer carries them to a different question. `.title`
returns to its base margin; `.questionTitle` owns the flex sizing.
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