chore(backlog): 记录 g14 完成

.ua/backlog.json

@@ -474,8 +474,8 @@
       "title": "演示站侧边目录支持关键字过滤",
       "motivation": "组件增至 35 个后侧边目录变长，定位区块只能靠滚动",
       "acceptance": "apps/demo/main.ts 的 buildToc 前置搜索框，输入按标题子串过滤目录链接（无匹配给空态提示），Esc 清空；不破坏 IntersectionObserver 高亮；npm run check 全绿",
-      "status": "open",
-      "notes": "自补：演示页完善方向"
+      "status": "done",
+      "notes": "buildToc 顶部加 type=search 输入框，input 事件按标题子串小写匹配过滤（hidden 属性 + .toc-link[hidden] 覆盖 display:block），无匹配显示 .toc-empty 空态，Esc 清空后恢复全量；IntersectionObserver 高亮逻辑未改动；样式写在 apps/demo/build.mjs 模板内"
     }
   ]
 }

.ua/iterations.log

@@ -56,3 +56,4 @@
 {"ts":"2026-10-26T10:23:31+08:00","id":"g09","result":"done","commit":"d8d45fc","summary":"新增 descriptions 描述列表：label:value 网格 + 列数变量化 + 窄屏单列 + bordered 表格形态"}
 {"ts":"2026-10-26T10:25:17+08:00","id":"g10","result":"done","commit":"2f8ccb6","summary":"新增 statistic 统计数值：rAF 滚动过渡 + 千分位精度 + 涨红跌绿趋势，减弱动效直落终值"}
 {"ts":"2026-10-26T10:27:10+08:00","id":"g12","result":"done","commit":"1b75fb4","summary":"verify 交叉校验 backlog done 与 iterations.log 留痕双向一致，注入违规即拦截"}
+{"ts":"2026-10-26T10:29:17+08:00","id":"g14","result":"done","commit":"b3c3bc7","summary":"演示站侧边目录加关键字过滤框：输入即筛、空态提示、Esc 清空，滚动高亮不受影响"}