iter: d05 新增面包屑 breadcrumb 组件

apps/demo/main.ts

@@ -3,6 +3,7 @@ import {
   accordion,
   alert,
   badge,
+  breadcrumb,
   button,
   card,
   checkbox,
@@ -237,6 +238,16 @@ const app = h(
       h('span', { class: 'out' }, () => (menuPick() ? `已选：${menuPick()}` : '未选择')),
     ),
   ),
+  section(
+    'sec-breadcrumb',
+    '面包屑',
+    'breadcrumb：nav + ol 语义结构，末项自动标为当前页，无 href 的条目走 onNavigate。',
+    breadcrumb({
+      items: [{ label: '首页', href: '#sec-counter' }, { label: '组件库' }, { label: '导航类' }, { label: '面包屑' }],
+      separator: '›',
+      onNavigate: (item) => toast.info(`跳转到 ${item.label}`),
+    }),
+  ),
   section(
     'sec-accordion',
     '折叠面板',