fix(collapse): 方向图标根据展开状态变化

src/module/breadcrumb/index.vue

@@ -5,7 +5,10 @@
 </template>
 
 <script setup name="LayBreadcrumb" lang="ts">
-import { defineProps, provide, withDefaults } from 'vue'
+import { defineProps, provide, withDefaults, useSlots } from 'vue'
+
+const slot = useSlots()
+const slots = slot.default && slot.default()
 
 const props = withDefaults(
   defineProps<{