fixed ux for expand object scrolling

src/components/FormGenerator/FormGeneratorTree/FormGeneratorTree.tsx

@@ -452,6 +452,7 @@ export function FormGeneratorTree<T = any>({
 
   const _handleToggleExpand = useCallback(
     async (id: string) => {
+      const wasExpanded = expandedIds.has(id);
       setExpandedIds((prev) => {
         const next = new Set(prev);
         if (next.has(id)) {
@@ -463,7 +464,7 @@ export function FormGeneratorTree<T = any>({
       });
 
       const node = nodes.find((n) => n.id === id);
-      if (node && !expandedIds.has(id)) {
+      if (node && !wasExpanded) {
         const childMap = _buildChildMap(nodes);
         const existingChildren = childMap.get(id);
         if (!existingChildren || existingChildren.length === 0) {
@@ -472,11 +473,28 @@ export function FormGeneratorTree<T = any>({
             setNodes((prev) => [...prev, ...childNodes]);
           }
         }
+        setTimeout(() => {
+          _scrollExpandedNodeToCenter(id);
+        }, 50);
       }
     },
     [nodes, expandedIds, provider, ownership],
   );
 
+  const _scrollExpandedNodeToCenter = useCallback((nodeId: string) => {
+    const container = treeContentRef.current;
+    if (!container) return;
+    const el = container.querySelector(`[data-node-id="${nodeId}"]`) as HTMLElement | null;
+    if (!el) return;
+    const containerRect = container.getBoundingClientRect();
+    const elRect = el.getBoundingClientRect();
+    const midpoint = containerRect.top + containerRect.height / 2;
+    if (elRect.top > midpoint) {
+      const scrollTarget = container.scrollTop + (elRect.top - midpoint);
+      container.scrollTo({ top: scrollTarget, behavior: 'smooth' });
+    }
+  }, []);
+
   const _handleToggleSelect = useCallback(
     (id: string, e: React.MouseEvent) => {
       const newSelection = new Set(selectedIds);

src/components/Navigation/TreeNavigation/TreeNavigation.tsx

@@ -10,7 +10,7 @@
  * - NavLink integration with React Router
  */
 
-import React, { useState, useEffect, ReactNode } from 'react';
+import React, { useState, useEffect, useRef, useCallback, ReactNode } from 'react';
 import { NavLink, useLocation } from 'react-router-dom';
 import styles from './TreeNavigation.module.css';
 
@@ -151,6 +151,7 @@ const TreeNode: React.FC<TreeNodeProps> = ({
   const [isExpanded, setIsExpanded] = useState(
     node.defaultExpanded ?? shouldAutoExpand ?? false
   );
+  const containerRef = useRef<HTMLDivElement>(null);
 
   // Auto-expand when path becomes active
   useEffect(() => {
@@ -159,6 +160,16 @@ const TreeNode: React.FC<TreeNodeProps> = ({
     }
   }, [currentPath, autoExpandActive, node]);
 
+  const _scrollAfterExpand = useCallback(() => {
+    const el = containerRef.current;
+    if (!el) return;
+    const rect = el.getBoundingClientRect();
+    const viewportMid = window.innerHeight / 2;
+    if (rect.top > viewportMid) {
+      el.scrollIntoView({ block: 'center', behavior: 'smooth' });
+    }
+  }, []);
+
   // Check if this node is active (exact match or ancestor of active path)
   const isActive = node.path ? currentPath === node.path || currentPath.startsWith(node.path + '/') : false;
   // Differentiate: leaf active (strong highlight) vs group active (subtle text only)
@@ -179,12 +190,13 @@ const TreeNode: React.FC<TreeNodeProps> = ({
     }
 
     if (isExpandable && !node.path) {
-      // If only expandable (no path), toggle expand
+      const willExpand = !isExpanded;
-      setIsExpanded(!isExpanded);
+      setIsExpanded(willExpand);
+      if (willExpand) setTimeout(_scrollAfterExpand, 50);
     } else if (isExpandable && node.path) {
-      // If both expandable and has path, expand on click but allow navigation
       if (!isExpanded) {
         setIsExpanded(true);
+        setTimeout(_scrollAfterExpand, 50);
       }
     }
 
@@ -197,7 +209,9 @@ const TreeNode: React.FC<TreeNodeProps> = ({
   const handleToggleClick = (e: React.MouseEvent) => {
     e.preventDefault();
     e.stopPropagation();
-    setIsExpanded(!isExpanded);
+    const willExpand = !isExpanded;
+    setIsExpanded(willExpand);
+    if (willExpand) setTimeout(_scrollAfterExpand, 50);
   };
 
   // Render the node content (actions are rendered outside to avoid button-in-button nesting)
@@ -255,7 +269,7 @@ const TreeNode: React.FC<TreeNodeProps> = ({
   const canRenderChildren = maxDepth === 0 || level < maxDepth;
 
   return (
-    <div className={styles.treeNodeContainer}>
+    <div className={styles.treeNodeContainer} ref={containerRef}>
       {nodeElement}
       {node.actions && (
         <span className={styles.nodeActions} onClick={(e) => e.stopPropagation()}>