feat(TreeSelect): add nav-text slot (#11602)

* feat(TreeSelect): render HTML toggling allowHtml

* feat(TreeSelect): Custom name of the parent node

* docs(TreeSelect): Add nav-text slot

packages/vant/src/tree-select/README.md

@@ -210,9 +210,10 @@ export default {
 
 ### Slots
 
-| Name    | Description          |
-| ------- | -------------------- |
-| content | Custom right content |
+| Name     | Description                    |
+| -------- | ------------------------------ |
+| nav-text | Custom name of the parent node |
+| content  | Custom right content           |
 
 ### Data Structure of TreeSelectItem
 

packages/vant/src/tree-select/README.zh-CN.md

@@ -218,9 +218,10 @@ export default {
 
 ### Slots
 
-| 名称    | 说明               |
-| ------- | ------------------ |
-| content | 自定义右侧区域内容 |
+| 名称     | 说明               |
+| -------- | ------------------ |
+| nav-text | 自定义导航名称     |
+| content  | 自定义右侧区域内容 |
 
 ### TreeSelectItem 数据结构
 

packages/vant/src/tree-select/TreeSelect.tsx

@@ -119,6 +119,7 @@ export default defineComponent({
           class={[bem('nav-item'), item.className]}
           disabled={item.disabled}
           onClick={onClickSidebarItem}
+          v-slots={{ title: slots['nav-text']?.() }}
         />
       ));