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/globals.css

@@ -1986,6 +1986,7 @@ a.j13-mention-token:hover {
     gap: 8px;
     margin-top: 6px;
   }
+  /* 板块胶囊：仅标识，不可点（列表行点击由 stretch-link 进帖） */
   .j13-board-tag {
     display: inline-flex;
     align-items: center;
@@ -1997,11 +1998,8 @@ a.j13-mention-token:hover {
     background: var(--tint);
     color: var(--ink-2);
     white-space: nowrap;
-    transition: background 0.15s ease, color 0.15s ease;
-  }
-  .j13-board-tag:hover {
-    background: var(--accent-soft);
-    color: var(--accent);
+    pointer-events: none;
+    user-select: none;
   }
 
   /* 站点公告标签：预设色板（浅/暗成对，文字与底色均满足 AA 对比度） */

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}