polish(frontend): 侧栏与徽章可读性，智能悬停提示

降权全站字重；优化右栏公告/数据块；类型状态徽章用固定浅色区分；TipHost 仅在文案不一致、非文字或省略时显示。

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

frontend/components/LikeButton.tsx

@@ -75,7 +75,7 @@ export default function LikeButton({
       data-tip={liked ? "取消点赞" : "点赞"}
       aria-label={liked ? "取消点赞" : "点赞"}
       aria-pressed={liked}
-      className={`j13-like inline-flex items-center justify-center font-semibold tabular-nums rounded-full border disabled:opacity-50 ${liked ? "is-liked" : ""} ${sizeCls}`}
+      className={`j13-like inline-flex items-center justify-center tabular-nums rounded-full border disabled:opacity-50 ${liked ? "is-liked" : ""} ${sizeCls}`}
     >
       <span key={String(liked)} className={liked ? "j13-heart-pop inline-flex" : "inline-flex"}>
         <IconHeart size={iconSize} filled={liked} />