chore(backlog): 记录 g305 完成

.ua/backlog.json

@@ -3135,11 +3135,11 @@
     {
       "id": "g305",
       "domain": "new",
-      "status": "open",
+      "status": "done",
       "title": "新增瀑布流布局 masonry（89 个组件）",
       "motivation": "库里有 grid（等宽等高的规则栅格）与 space（线性间距），但图片墙、评论流、看板这类「列高不等」的布局没有落点，业务侧只能自己写 column-width 与 break-inside，还要记住多列容器不能是 flex/grid 这个坑。",
       "acceptance": "① masonry({ items, columns?, minColumnWidth?, gap? }) 走 CSS 多列：不传 columns 按 minColumnWidth 自适应，传了即固定列数；② 每项包 .ua-masonry-item 并 break-inside: avoid，卡片不在列边界拆断；③ gap 同时管列间距与行间距；④ 样式只消费 --ua-* 令牌，禁止新增硬编码阴影/时长/字号；⑤ manifest/docs/README/demo/llms-full 同步，组件 88→89，npm run check 全绿。",
-      "notes": ""
+      "notes": "新增 src/masonry.ts（22 行）+ types + index + ui.css 两条；CSS 多列实现：不传 columns 走 column-width 自适应，传了即 column-count 固定列数，gap 一处同时给 column-gap 与 item margin-bottom，item 带 break-inside: avoid；组件 88→89，README/AGENTS/ARCHITECTURE 计数与 docs 同步"
     }
   ]
 }

.ua/iterations.log

@@ -349,3 +349,4 @@
 {"ts":"2026-10-27T00:30:36+08:00","id":"g302","result":"done","commit":"9cb953e","summary":"表头 Shift+点击接上内核多列排序，标记带优先级序号"}
 {"ts":"2026-10-27T00:32:15+08:00","id":"g303","result":"done","commit":"468b177","summary":"拖拽行去掉整行透明度，改抬升投影 + 虚线边，正文对比回到 12"}
 {"ts":"2026-10-27T00:33:10+08:00","id":"g304","result":"done","commit":"0851de9","summary":"配方 19：可排序检查单，补上句柄式组件的拼装样例"}
+{"ts":"2026-10-27T00:34:25+08:00","id":"g305","result":"done","commit":"08f14ce","summary":"新增 masonry 瀑布流（89 组件）：多列布局，列宽自适应或固定列数"}