fix(tree-select): hoist Row to module scope to prevent row remounts

The row renderer was defined inside VirtualizedTree, giving it a new
component identity on every parent render — react-window then remounted
every row, destroying row DOM/state. Move Row to module scope and pass
flattened/tree/renderNode through react-window's rowProps instead of the
closure.

Verified at runtime: rows render, expand/collapse and select work, and
selection state survives re-renders, with no console errors.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

components/tree-select/VirtualizedTree.tsx

@@ -4,8 +4,8 @@ import {
   TreeNodeData,
   UseTreeReturnType,
 } from "@mantine/core"
-import React, { CSSProperties, useMemo } from "react"
+import React, { useMemo } from "react"
-import { List } from "react-window"
+import { List, RowComponentProps } from "react-window"
 import "./mantine-scrollbar.css"
 
 export interface VirtualizedTreeProps {
@@ -51,30 +51,24 @@ function flattenByExpanded(
   return res
 }
 
+/** 行渲染所需的闭包数据，通过 react-window 的 rowProps 传入 */
+interface RowData {
+  flattened: { node: TreeNodeData; level: number }[]
+  tree: UseTreeReturnType
+  renderNode: (payload: RenderTreeNodePayload) => React.ReactNode
+}
+
 /**
- * VirtualizedTree - Mantine v8 compatible virtualized Tree
+ * 单行渲染组件 —— 提到模块作用域，避免每次父组件渲染都生成新的组件实例
- *  - Accepts tree (useTree() result) and data: TreeNodeData[]
+ * （否则 react-window 会在每次渲染时 remount 所有行，销毁行内状态）
- *  - Passes RenderTreeNodePayload to renderNode exactly like Mantine
- *  - Uses react-window FixedSizeList for virtualization
  */
-export function VirtualizedTree({
+function Row({
+  index,
+  style,
+  flattened,
   tree,
-  data,
   renderNode,
-  // levelOffset = 24,
+}: RowComponentProps<RowData>) {
-  height = 400,
-  itemSize = 36,
-  overscanCount = 5,
-}: VirtualizedTreeProps) {
-  // 扁平化数据：根据 tree.expandedState 决定哪些子节点可见
-  const flattened = useMemo(
-    () =>
-      flattenByExpanded(data, (tree && (tree as any).expandedState) || {}, 0),
-    [data, tree]
-  )
-  // react-window 的行渲染
-  /** 单行渲染组件 */
-  const Row = ({ index, style }: { index: number; style: CSSProperties }) => {
   const { node, level } = flattened[index]
 
   // 构造 Mantine 的 RenderTreeNodePayload
@@ -129,14 +123,36 @@ export function VirtualizedTree({
   return <div style={paddedStyle}>{renderNode(payload)}</div>
 }
 
+/**
+ * VirtualizedTree - Mantine v8 compatible virtualized Tree
+ *  - Accepts tree (useTree() result) and data: TreeNodeData[]
+ *  - Passes RenderTreeNodePayload to renderNode exactly like Mantine
+ *  - Uses react-window FixedSizeList for virtualization
+ */
+export function VirtualizedTree({
+  tree,
+  data,
+  renderNode,
+  // levelOffset = 24,
+  height = 400,
+  itemSize = 36,
+  overscanCount = 5,
+}: VirtualizedTreeProps) {
+  // 扁平化数据：根据 tree.expandedState 决定哪些子节点可见
+  const flattened = useMemo(
+    () =>
+      flattenByExpanded(data, (tree && (tree as any).expandedState) || {}, 0),
+    [data, tree]
+  )
+
   return (
     <List
       rowCount={flattened.length}
       style={{ height, width: "100%" }}
       className="custom-scrollbar"
       rowHeight={itemSize}
-      rowComponent={({ index, style }) => <Row index={index} style={style} />}
+      rowComponent={Row}
-      rowProps={{}}
+      rowProps={{ flattened, tree, renderNode }}
       overscanCount={overscanCount}></List>
   )
 }