feat(lotto): DecisionCard 하위 컴포넌트(Pick/Tier/Toggle/Retro) + 스타일

src/pages/lotto/components/decision/RetrospectiveBox.jsx

@@ -0,0 +1,11 @@
+export default function RetrospectiveBox({ briefing, review }) {
+    const retro = briefing?.narrative?.retrospective;
+    if (!retro) return null;
+    const drawNo = review?.draw_no ?? (briefing?.draw_no ? briefing.draw_no - 1 : null);
+    return (
+        <aside className="lc-retro">
+            <p className="lc-retro__time">▸ 지난 주 {drawNo ? `${drawNo}회` : ''} 회고</p>
+            <p className="lc-retro__body">{retro}</p>
+        </aside>
+    );
+}