polish(feed): 列表行整区进帖，板块胶囊不可点

修复 meta 抬层挡住 stretch，并统一作者与回复者 hover 变色。

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

frontend/app/page.tsx

@@ -124,7 +124,7 @@ export default async function HomePage({ searchParams }: HomePageProps) {
         <div className="panel overflow-hidden">
           {postsData.posts.length > 0 ? (
             postsData.posts.map((post, i) => (
-              <PostRow key={post.id} post={post} boardHref index={i} showViews={false} showLike={false} />
+              <PostRow key={post.id} post={post} showBoard index={i} showViews={false} showLike={false} />
             ))
           ) : (
             <EmptyState keyword={keyword} />
@@ -185,7 +185,7 @@ export default async function HomePage({ searchParams }: HomePageProps) {
                 <PostRow
                   key={post.id}
                   post={post}
-                  boardHref={!activeBoard}
+                  showBoard={!activeBoard}
                   compact
                   index={i}
                   showViews={false}