fix color & freeze

frontend/src/views/TierEditorView.vue

@@ -456,7 +456,7 @@ function duplicateItemToPool() {
   pool.value = [clonedId, ...pool.value]
   selectedItemId.value = clonedId
   closeItemContextMenu()
-  toast.success('복제본을 미사용 아이템 목록에 추가했어요.')
+  toast.success('아이템 추가 완료')
 }
 
 function handleGlobalContextMenu(event) {
@@ -3071,7 +3071,7 @@ onUnmounted(() => {
   padding: 8px;
   border-radius: 16px;
   border: 1px solid var(--theme-border);
-  background: var(--theme-card-bg);
+  background: color-mix(in srgb, var(--theme-main-bg) 96%, transparent);
   box-shadow: 0 24px 48px rgba(0, 0, 0, 0.28);
 }