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/home/FeedNewTip.tsx

@@ -60,7 +60,7 @@ export default function FeedNewTip({
       <button
         type="button"
         onClick={handleClick}
-        className="j13-feed-new-tip w-full inline-flex items-center justify-center gap-1.5 py-2 px-3 text-[13px] font-semibold rounded-[var(--r-sm)] transition-colors"
+        className="j13-feed-new-tip w-full inline-flex items-center justify-center gap-1.5 py-2 px-3 text-[13px] rounded-[var(--r-sm)] transition-colors"
         style={{
           color: "var(--accent)",
           background: "var(--accent-soft)",