fix(frontend): 移除易被误认为加载条的顶部阅读进度条

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

frontend/app/globals.css

@@ -2190,16 +2190,3 @@ html.dark .prose-content .shiki span {
   transform: translateY(0);
   outline: none;
 }
-
-/* 阅读进度条 */
-.reading-progress {
-  position: fixed;
-  top: 0;
-  left: 0;
-  right: 0;
-  height: 3px;
-  z-index: 60;
-  background: var(--accent);
-  transform-origin: 0 50%;
-  pointer-events: none;
-}

frontend/app/post/[id]/page.tsx

@@ -27,7 +27,6 @@ import { getMeCached } from "@/lib/serverData";
 import CommentSection from "@/components/CommentSection";
 import PostActions from "@/components/PostActions";
 import LikeButton from "@/components/LikeButton";
-import ReadingProgress from "@/components/ReadingProgress";
 import PostToc, { type TocItem } from "@/components/PostToc";
 import MobilePostBar from "@/components/MobilePostBar";
 import Avatar from "@/components/Avatar";
@@ -454,7 +453,6 @@ export default async function PostDetailPage({ params, searchParams }: PageProps
 
   return (
     <>
-      <ReadingProgress />
       <script type="application/ld+json" dangerouslySetInnerHTML={{ __html: JSON.stringify(jsonLd) }} />
       {/* 移动端浮动操作条：长文阅读中途可点赞 / 跳评论 / 回顶部 */}
       <MobilePostBar postId={id} liked={post.liked} likeCount={post.like_count} />