Revert "refactor(web): remove redundant useUnifiedDrag abstraction layer"

This reverts commit ee91c9d5f1.

web/app/components/workflow/skill/hooks/use-folder-file-drop.ts

@@ -4,10 +4,11 @@
 
 import type { NodeApi } from 'react-arborist'
 import type { TreeNodeData } from '../type'
+import type { AppAssetTreeView } from '@/types/app-asset'
 import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
 import { useStore } from '@/app/components/workflow/store'
-import { isFileDrag } from '../utils/drag-utils'
-import { useFileDrop } from './use-file-drop'
+import { isDragEvent } from '../utils/drag-utils'
+import { useUnifiedDrag } from './use-unified-drag'
 
 type UseFolderFileDropReturn = {
   isDragOver: boolean
@@ -26,14 +27,15 @@ const AUTO_EXPAND_DELAY_MS = 2000
 
 type UseFolderFileDropOptions = {
   node: NodeApi<TreeNodeData>
+  treeChildren: AppAssetTreeView[]
 }
 
-export function useFolderFileDrop({ node }: UseFolderFileDropOptions): UseFolderFileDropReturn {
+export function useFolderFileDrop({ node, treeChildren: _treeChildren }: UseFolderFileDropOptions): UseFolderFileDropReturn {
   const isFolder = node.data.node_type === 'folder'
   const dragOverFolderId = useStore(s => s.dragOverFolderId)
   const isDragOver = isFolder && dragOverFolderId === node.data.id
 
-  const { handleDragOver, handleDrop } = useFileDrop()
+  const { handleDragOver, handleDrop } = useUnifiedDrag()
 
   const expandTimerRef = useRef<NodeJS.Timeout | null>(null)
   const blinkTimerRef = useRef<NodeJS.Timeout | null>(null)
@@ -84,7 +86,7 @@ export function useFolderFileDrop({ node }: UseFolderFileDropOptions): UseFolder
   }, [clearExpandTimer])
 
   const handleFolderDragEnter = useCallback((e: React.DragEvent) => {
-    if (!isFolder || !isFileDrag(e))
+    if (!isFolder || !isDragEvent(e))
       return
     dragCounterRef.current += 1
     if (dragCounterRef.current === 1)
@@ -92,13 +94,13 @@ export function useFolderFileDrop({ node }: UseFolderFileDropOptions): UseFolder
   }, [isFolder, scheduleAutoExpand])
 
   const handleFolderDragOver = useCallback((e: React.DragEvent) => {
-    if (!isFolder || !isFileDrag(e))
+    if (!isFolder || !isDragEvent(e))
       return
     handleDragOver(e, { folderId: node.data.id, isFolder: true })
   }, [handleDragOver, isFolder, node.data.id])
 
   const handleFolderDragLeave = useCallback((e: React.DragEvent) => {
-    if (!isFolder || !isFileDrag(e))
+    if (!isFolder || !isDragEvent(e))
       return
     dragCounterRef.current = Math.max(dragCounterRef.current - 1, 0)
     if (dragCounterRef.current === 0)

web/app/components/workflow/skill/hooks/use-root-file-drop.ts

@@ -2,9 +2,10 @@
 
 // Root-level file drop handler with drag counter to handle nested DOM events
 
+import type { AppAssetTreeView } from '@/types/app-asset'
 import { useCallback, useRef } from 'react'
-import { isFileDrag } from '../utils/drag-utils'
-import { useFileDrop } from './use-file-drop'
+import { isDragEvent } from '../utils/drag-utils'
+import { useUnifiedDrag } from './use-unified-drag'
 
 type UseRootFileDropReturn = {
   handleRootDragEnter: (e: React.DragEvent) => void
@@ -14,12 +15,16 @@ type UseRootFileDropReturn = {
   resetRootDragCounter: () => void
 }
 
-export function useRootFileDrop(): UseRootFileDropReturn {
-  const { handleDragOver, handleDragLeave, handleDrop } = useFileDrop()
+type UseRootFileDropOptions = {
+  treeChildren: AppAssetTreeView[]
+}
+
+export function useRootFileDrop({ treeChildren: _treeChildren }: UseRootFileDropOptions): UseRootFileDropReturn {
+  const { handleDragOver, handleDragLeave, handleDrop } = useUnifiedDrag()
   const dragCounterRef = useRef(0)
 
   const handleRootDragEnter = useCallback((e: React.DragEvent) => {
-    if (!isFileDrag(e))
+    if (!isDragEvent(e))
       return
     dragCounterRef.current += 1
   }, [])
@@ -29,7 +34,7 @@ export function useRootFileDrop(): UseRootFileDropReturn {
   }, [handleDragOver])
 
   const handleRootDragLeave = useCallback((e: React.DragEvent) => {
-    if (!isFileDrag(e))
+    if (!isDragEvent(e))
       return
     dragCounterRef.current = Math.max(dragCounterRef.current - 1, 0)
     if (dragCounterRef.current === 0)

web/app/components/workflow/skill/hooks/use-unified-drag.ts

@@ -0,0 +1,40 @@
+'use client'
+
+// Unified drag handler for external file uploads
+// Internal node drag-move is now handled by react-arborist's built-in drag system
+
+import { useCallback } from 'react'
+import { isFileDrag } from '../utils/drag-utils'
+import { useFileDrop } from './use-file-drop'
+
+type DragTarget = {
+  folderId: string | null
+  isFolder: boolean
+}
+
+export function useUnifiedDrag() {
+  const fileDrop = useFileDrop()
+
+  // Only handle external file drags - internal node drags are handled by react-arborist
+  const handleDragOver = useCallback((e: React.DragEvent, target: DragTarget) => {
+    if (isFileDrag(e))
+      fileDrop.handleDragOver(e, target)
+  }, [fileDrop])
+
+  const handleDragLeave = useCallback((e: React.DragEvent) => {
+    if (isFileDrag(e))
+      fileDrop.handleDragLeave(e)
+  }, [fileDrop])
+
+  const handleDrop = useCallback((e: React.DragEvent, targetFolderId: string | null) => {
+    if (isFileDrag(e))
+      return fileDrop.handleDrop(e, targetFolderId)
+  }, [fileDrop])
+
+  return {
+    handleDragOver,
+    handleDragLeave,
+    handleDrop,
+    isUploading: fileDrop.isUploading,
+  }
+}