The choice button above the panel already shows the letter badge,
choice text, and percentage, so repeating them in the panel header
was redundant now that the panel is docked inside the choice's card.
Keeps the collapse toggle, now named FollowupToggle since the old
FollowupSummary button it lived on is gone.
A choice that was crossed out (right-click) and also happened to be
locked as the submitted-wrong choice, or revealed as the correct
answer, silently lost its strikethrough because the percentage-badge
branches took precedence over the elimination check in the same
if/elif chain. Decoupled the two so a choice can show both the
strikethrough and its reveal percentage at once.
hz