v0.0.50 문서 스크롤로 통일하고 사이드바 스티키·무스크롤바

중앙 main 단독 스크롤을 제거하고 sticky 사이드+숨김 스크롤바로 Thred에 맞춘다.

Co-authored-by: Cursor <cursoragent@cursor.com>

components/site/RightSidebar.vue

@@ -19,8 +19,8 @@ const { data: siteSettings } = await useFetch('/api/site-settings', {
 </script>
 
 <template>
-  <aside class="right-sidebar site-sidebar hidden min-h-0 max-h-full w-[287px] overflow-hidden border-l border-[var(--site-line)] lg:flex lg:h-full lg:flex-col">
-    <div class="right-sidebar__scroll min-h-0 flex-1 overflow-y-auto">
+  <aside class="right-sidebar site-sidebar hidden w-[287px] overflow-hidden border-l border-[var(--site-line)] lg:sticky lg:top-[57px] lg:z-10 lg:max-h-[calc(100vh-57px)] lg:self-start lg:flex lg:flex-col">
+    <div class="right-sidebar__scroll site-sidebar-scroll min-h-0 flex-1">
       <div class="right-sidebar__block site-sidebar-section py-5 pl-5 pr-0">
         <div class="right-sidebar__profile flex items-center gap-3">
           <div class="right-sidebar__logo grid h-12 w-12 place-items-center rounded-2xl bg-[var(--site-invert)] text-2xl font-bold text-[var(--site-invert-text)]">