로딩 문구와 제목 보정

frontend/src/views/TopicHubView.vue

@@ -20,7 +20,7 @@ const error = ref('')
 const brokenThumbnailIds = ref({})
 const isTopicLoading = ref(false)
 const isListView = computed(() => route.query.view === 'list')
-const topicTitle = computed(() => topicName.value || (isTopicLoading.value ? '주제 불러오는 중...' : ''))
+const topicTitle = computed(() => topicName.value || '')
 const publicTierLists = computed(() => tierLists.value.filter((tierList) => !tierList.isFeatured))
 
 function fmt(ts) {
@@ -88,6 +88,9 @@ watch(
   [topicId, query],
   () => {
     topicName.value = ''
+    featuredTierLists.value = []
+    tierLists.value = []
+    brokenThumbnailIds.value = {}
     error.value = ''
     loadTierLists()
   },
@@ -100,8 +103,16 @@ watch(
     <section class="pageHead">
     <div class="pageHead__main">
       <div class="pageHead__eyebrow">Collection</div>
-      <h2 class="pageHead__title">{{ topicTitle }}</h2>
-      <div class="pageHead__desc">이 주제의 공개 티어표를 같은 카드 레이아웃으로 살펴보고 이어서 새 티어표를 만들 수 있어요.</div>
+      <template v-if="isTopicLoading && !topicTitle">
+        <div class="topicHeadSkeleton" aria-hidden="true">
+          <div class="topicHeadSkeleton__line topicHeadSkeleton__line--title"></div>
+          <div class="topicHeadSkeleton__line topicHeadSkeleton__line--desc"></div>
+        </div>
+      </template>
+      <template v-else>
+        <h2 class="pageHead__title">{{ topicTitle }}</h2>
+        <div class="pageHead__desc">이 주제의 공개 티어표를 같은 카드 레이아웃으로 살펴보고 이어서 새 티어표를 만들 수 있어요.</div>
+      </template>
     </div>
     </section>
 
@@ -194,6 +205,39 @@ watch(
 </template>
 
 <style scoped>
+.topicHeadSkeleton {
+  display: grid;
+  gap: 10px;
+}
+.topicHeadSkeleton__line {
+  position: relative;
+  overflow: hidden;
+  border-radius: 999px;
+  background: color-mix(in srgb, var(--theme-surface-soft-2) 88%, transparent);
+}
+.topicHeadSkeleton__line::after {
+  content: '';
+  position: absolute;
+  inset: 0;
+  background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.08) 48%, transparent 100%);
+  transform: translateX(-100%);
+  animation: topicHeadSkeletonShimmer 1.4s ease-in-out infinite;
+}
+.topicHeadSkeleton__line--title {
+  width: min(280px, 72%);
+  height: 34px;
+}
+.topicHeadSkeleton__line--desc {
+  width: min(560px, 94%);
+  height: 14px;
+}
+
+@keyframes topicHeadSkeletonShimmer {
+  100% {
+    transform: translateX(100%);
+  }
+}
+
 .panel {
   background: transparent;
   border-radius: 0;