fix: restore summer event calculation through source deployment

src/lib/engine/event-optimization.test.ts

@@ -5,6 +5,40 @@ import { activeEventAt, compareEventRankings, eventBonusBreakdown, eventChalleng
 
 const currentEvent = events[0];
 
+test('솔로 이벤트는 챕터 경계에서 대상 멤버와 과제곡을 함께 전환한다', () => {
+  assert.equal(activeEventAt(events, Date.parse('2026-09-19T10:59:59.999Z')), null);
+  const expected = [
+    [19, 'chr-00004', 'm0349'], [21, 'chr-04013', 'm0351'],
+    [23, 'chr-00035', 'm0350'], [25, 'chr-03005', 'm0352']
+  ] as const;
+  for (const [day, characterId, songId] of expected) {
+    const start = Date.parse(`2026-09-${day}T11:00:00.000Z`);
+    const chapter = activeEventAt(events, start)!;
+    assert.deepEqual(chapter.bonusCharacterIds, [characterId]);
+    assert.deepEqual(Object.keys(chapter.challengeSongBonusCardIds), [songId]);
+    assert.equal(activeEventAt(events, start + 48 * 60 * 60 * 1000 - 1)?.id, chapter.id);
+    assert.notEqual(activeEventAt(events, start - 1)?.id, chapter.id);
+  }
+  assert.equal(activeEventAt(events, Date.parse('2026-09-27T11:00:00.000Z')), null);
+});
+
+test('신규 카드 공통 보너스와 현재 챕터 멤버 보너스를 따로 적용한다', () => {
+  const aki = activeEventAt(events, Date.parse('2026-09-19T11:00:00Z'))!;
+  const shiori = activeEventAt(events, Date.parse('2026-09-21T11:00:00Z'))!;
+  const cards = [
+    { id: aki.featuredCardIds[0], characterId: 'chr-00004', rarity: 5 },
+    { id: 'shiori-regular', characterId: 'chr-04013', rarity: 3 }
+  ];
+  assert.deepEqual(eventBonusBreakdown(aki, cards, () => 5), {
+    formationPercent: 50, featuredCardPercent: 50, awakeningPercent: 33, totalPercent: 133
+  });
+  assert.equal(eventBonusBreakdown(shiori, [cards[0]], () => 0).totalPercent, 50);
+  assert.equal(eventBonusBreakdown(shiori, [cards[1]], () => 0).totalPercent, 50);
+  assert.equal(eventChallengeSongScoreBonusPercent(aki, 'm0349', [cards[0].id]), 10);
+  assert.equal(eventChallengeSongScoreBonusPercent(shiori, 'm0349', [cards[0].id]), 0);
+  assert.equal(eventChallengeSongScoreBonusPercent(aki, 'm0349', [aki.featuredCardIds[1]]), 0);
+});
+
 test('이벤트 기간 안에서만 진행 중 이벤트를 반환한다', () => {
   assert.equal(activeEventAt(events, Date.parse('2026-08-29T02:59:59.999Z')), null);
   assert.equal(activeEventAt(events, Date.parse('2026-08-31T00:00:00.000Z'))?.id, currentEvent.id);