fix: apply event song bonus to final score

src/lib/engine/score.test.ts

@@ -38,6 +38,29 @@ test('기본점수의 소수점을 유지하고 가창 보너스 적용 후 노
   assert.equal(result.baselineScore, 1_490);
 });
 
+test('이벤트 보너스는 가창 보너스와 따로 노트 합계에 곱하고 노트 점수는 유지한다', () => {
+  const song = { ...chart([
+    { timeSeconds: 1, type: 'regular' as const, isFlick: false },
+    { timeSeconds: 1.5, type: 'regular' as const, isFlick: true },
+    { timeSeconds: 2, type: 'mid' as const, isFlick: false }
+  ]), specialStartSeconds: [1] };
+  const card = { ...inactiveCard,
+    active: { cooldownSeconds: 1, durationSeconds: 1, scoreUpPercent: 85, probabilityPercent: 50 },
+    special: { durationSeconds: 2, scoreUpPercent: 120 }
+  };
+  const options = { perfectNoteScore: 1354.507, directSongScoreBonusPercent: 10 };
+  const ordinary = calculateExactScore([card], {}, song, options);
+  const event = calculateExactScore([card], {}, song, { ...options, finalScoreBonusPercent: 10 });
+  for (const key of ['expectedScore', 'theoreticalMaxScore', 'baselineScore', 'withoutSpecialStartBonusScore'] as const) {
+    assert.equal(event[key], ordinary[key]! * 1.1);
+  }
+  assert.deepEqual(event.notes, ordinary.notes);
+  assert.deepEqual(event.scoreBySecond, ordinary.scoreBySecond);
+  assert.equal(event.perfectNoteScore, ordinary.perfectNoteScore);
+  assert.notEqual(event.theoreticalMaxScore,
+    calculateExactScore([card], {}, song, { ...options, directSongScoreBonusPercent: 20 }).theoreticalMaxScore);
+});
+
 test('100콤보부터 1% 콤보 보너스를 적용한다', () => {
   const notes = Array.from({ length: 100 }, (_, index) => ({ timeSeconds: index, type: 'regular' as const, isFlick: false }));
   const result = calculateExactScore([inactiveCard], {}, chart(notes), { perfectNoteScore: 600 });