feat: support four-star leader outfits

src/routes/combination/+page.svelte

@@ -2,6 +2,7 @@
   import { onMount } from 'svelte';
   import { page } from '$app/stores';
   import cardSummary from '$lib/data/cards-summary.json';
+  import { leaderOutfitCards } from '$lib/engine/leader-outfits.ts';
   import boardSummary from '$lib/data/boards-summary.json';
   import memorySummary from '$lib/data/memory-summary.json';
   import exactChartCatalog from '$lib/data/exact-chart-catalog.json';
@@ -197,8 +198,7 @@
     : eligibleCards;
   $: leaderMember = leaderMembers.find((card) => card.characterId === leaderCharacterId);
   $: leaderOutfitOptions = leaderMember
-    ? fiveStarCards.filter((card) => card.characterId === leaderCharacterId && card.details.costume)
-      .filter((card, index, cards) => cards.findIndex((entry) => entry.details.costume?.name === card.details.costume?.name) === index)
+    ? leaderOutfitCards(allCards, leaderCharacterId)
     : [];
   $: leaderOutfit = cardById.get(leaderOutfitCardId)?.details.costume ?? null;
   $: leaderOutfitDescription = (leaderOutfit?.description ?? '')
@@ -1240,7 +1240,7 @@
     </div>
     <div class="outfit-effect">
       <span>리더 의상 효과</span>
-      <p>{leaderOutfitDescription || '적용할 수 있는 5성 의상이 없습니다.'}</p>
+      <p>{leaderOutfitDescription || '적용할 수 있는 의상이 없습니다.'}</p>
     </div>
     <p class="hint">기수 보너스와 가창 보너스 덮어쓰기는 빈칸이면 저장된 실제 보드를 사용하고, 숫자를 입력하면 해당 값으로 대체합니다. 자동 후보는 파란 노드 전체 활성화·기수 보너스 {candidateGenerationBonus === null ? '저장값' : candidateGenerationBonus}·가창 보너스 {songScoreBonusOverride === null ? '실제 보드값' : `${songScoreBonusOverride}%`} 조건으로 비교합니다.</p>
     <PresetManager storageKey={PRESET_STORAGE_KEY} snapshot={presetSnapshot} disabled={running} on:apply={applyPreset} />