fix: 모바일 오른쪽 레일 스크롤과 프리뷰 카드 배치 보정

frontend/src/App.vue

@@ -146,6 +146,7 @@ const showSettingsThemePanel = computed(() => route.name === 'profile')
 const showTopicViewToggle = computed(() => route.name === 'topicHub')
 const topicViewMode = computed(() => (route.query.view === 'list' ? 'list' : 'grid'))
 const showBackendFallback = computed(() => !isPreviewMode.value && ['maintenance', 'offline'].includes(backendState.value))
+const shouldLockRightRailBodyScroll = computed(() => isRightRailOverlay.value && rightRailOpen.value && !showBackendFallback.value)
 const leftBottomPrimaryAction = computed(() => {
   if (!authReady.value) return null
   if (route.name === 'home' && auth.user) {
@@ -296,6 +297,11 @@ function toggleTheme() {
   applyTheme(isLightTheme.value ? 'dark' : 'light')
 }
 
+function syncRightRailBodyScrollLock(shouldLock) {
+  if (typeof document === 'undefined') return
+  document.body.style.overflow = shouldLock ? 'hidden' : ''
+}
+
 onMounted(async () => {
   if (typeof window !== 'undefined') {
     const savedTheme = window.localStorage.getItem('tier-maker:theme')
@@ -338,6 +344,7 @@ onBeforeUnmount(() => {
     window.removeEventListener('resize', syncViewportWidth)
     window.removeEventListener('keydown', handleGlobalKeydown)
   }
+  syncRightRailBodyScrollLock(false)
 })
 
 watch(
@@ -383,6 +390,14 @@ watch(
   { immediate: true }
 )
 
+watch(
+  shouldLockRightRailBodyScroll,
+  (shouldLock) => {
+    syncRightRailBodyScrollLock(shouldLock)
+  },
+  { immediate: true }
+)
+
 function isRouteActive(path) {
   if (path === '/') return route.path === '/'
   return route.path.startsWith(path)
@@ -2186,6 +2201,15 @@ function reloadApp() {
     padding: 14px 20px calc(32px + env(safe-area-inset-bottom));
   }
 
+  .rightRail--overlay .rightRail__content {
+    flex: 0 0 auto;
+    overflow: visible;
+  }
+
+  .rightRail--overlay .localRightRailRoot {
+    min-height: auto;
+  }
+
   .collapsedSearchModal {
     padding: 72px 16px 16px;
   }

frontend/src/views/TierEditorView.vue

@@ -3198,6 +3198,9 @@ onUnmounted(() => {
   .previewOnly {
     padding: 14px;
   }
+  .viewerSidebar__section {
+    margin-top: 0;
+  }
   .pool {
     grid-template-columns: repeat(4, minmax(0, 1fr));
   }