feat: add UI-only group node types and enhance workflow graph processing

web/app/components/workflow/custom-group-node/constants.ts

@@ -0,0 +1,11 @@
+export const CUSTOM_GROUP_NODE = 'custom-group'
+export const CUSTOM_GROUP_INPUT_NODE = 'custom-group-input'
+export const CUSTOM_GROUP_EXIT_PORT_NODE = 'custom-group-exit-port'
+
+export const GROUP_CHILDREN_Z_INDEX = 1002
+
+export const UI_ONLY_GROUP_NODE_TYPES = new Set([
+  CUSTOM_GROUP_NODE,
+  CUSTOM_GROUP_INPUT_NODE,
+  CUSTOM_GROUP_EXIT_PORT_NODE,
+])

web/app/components/workflow/custom-group-node/custom-group-exit-port-node.tsx

@@ -0,0 +1,54 @@
+'use client'
+
+import type { FC } from 'react'
+import { memo } from 'react'
+import { Handle, Position } from 'reactflow'
+import type { CustomGroupExitPortNodeData } from './types'
+import cn from '@/utils/classnames'
+
+type CustomGroupExitPortNodeProps = {
+  id: string
+  data: CustomGroupExitPortNodeData
+}
+
+const CustomGroupExitPortNode: FC<CustomGroupExitPortNodeProps> = ({ id: _id, data }) => {
+  return (
+    <div
+      className={cn(
+        'flex items-center justify-center',
+        'h-8 w-8 rounded-full',
+        'bg-util-colors-green-green-500 shadow-md',
+        data.selected && 'ring-2 ring-primary-400',
+      )}
+    >
+      {/* Target handle - receives internal connections from leaf nodes */}
+      <Handle
+        id="target"
+        type="target"
+        position={Position.Left}
+        className="!h-2 !w-2 !border-0 !bg-white"
+      />
+
+      {/* Source handle - connects to external nodes */}
+      <Handle
+        id="source"
+        type="source"
+        position={Position.Right}
+        className="!h-2 !w-2 !border-0 !bg-white"
+      />
+
+      {/* Icon */}
+      <svg
+        className="h-4 w-4 text-white"
+        viewBox="0 0 24 24"
+        fill="none"
+        stroke="currentColor"
+        strokeWidth={2}
+      >
+        <path d="M5 12h14M12 5l7 7-7 7" />
+      </svg>
+    </div>
+  )
+}
+
+export default memo(CustomGroupExitPortNode)

web/app/components/workflow/custom-group-node/custom-group-input-node.tsx

@@ -0,0 +1,55 @@
+'use client'
+
+import type { FC } from 'react'
+import { memo } from 'react'
+import { Handle, Position } from 'reactflow'
+import type { CustomGroupInputNodeData } from './types'
+import cn from '@/utils/classnames'
+
+type CustomGroupInputNodeProps = {
+  id: string
+  data: CustomGroupInputNodeData
+}
+
+const CustomGroupInputNode: FC<CustomGroupInputNodeProps> = ({ id: _id, data }) => {
+  return (
+    <div
+      className={cn(
+        'flex items-center justify-center',
+        'h-8 w-8 rounded-full',
+        'bg-util-colors-blue-blue-500 shadow-md',
+        data.selected && 'ring-2 ring-primary-400',
+      )}
+    >
+      {/* Target handle - receives external connections */}
+      <Handle
+        id="target"
+        type="target"
+        position={Position.Left}
+        className="!h-2 !w-2 !border-0 !bg-white"
+      />
+
+      {/* Source handle - connects to entry nodes */}
+      <Handle
+        id="source"
+        type="source"
+        position={Position.Right}
+        className="!h-2 !w-2 !border-0 !bg-white"
+      />
+
+      {/* Icon */}
+      <svg
+        className="h-4 w-4 text-white"
+        viewBox="0 0 24 24"
+        fill="none"
+        stroke="currentColor"
+        strokeWidth={2}
+      >
+        <path d="M9 12l2 2 4-4" />
+        <circle cx="12" cy="12" r="10" />
+      </svg>
+    </div>
+  )
+}
+
+export default memo(CustomGroupInputNode)

web/app/components/workflow/custom-group-node/custom-group-node.tsx

@@ -0,0 +1,49 @@
+'use client'
+
+import type { FC } from 'react'
+import { memo } from 'react'
+import { Handle, Position } from 'reactflow'
+import type { CustomGroupNodeData } from './types'
+import cn from '@/utils/classnames'
+
+type CustomGroupNodeProps = {
+  id: string
+  data: CustomGroupNodeData
+}
+
+const CustomGroupNode: FC<CustomGroupNodeProps> = ({ id: _id, data }) => {
+  const { group } = data
+
+  return (
+    <div
+      className={cn(
+        'bg-workflow-block-parma-bg/50 relative rounded-2xl border-2 border-dashed border-components-panel-border',
+        data.selected && 'border-primary-400',
+      )}
+      style={{
+        width: data.width || 280,
+        height: data.height || 200,
+      }}
+    >
+      {/* Group Header */}
+      <div className="absolute -top-7 left-0 flex items-center gap-1 px-2">
+        <span className="text-xs font-medium text-text-tertiary">
+          {group.title}
+        </span>
+      </div>
+
+      {/* Target handle for incoming connections */}
+      <Handle
+        id="target"
+        type="target"
+        position={Position.Left}
+        className="!h-4 !w-4 !border-2 !border-white !bg-primary-500"
+        style={{ top: '50%' }}
+      />
+
+      {/* Source handles will be rendered by exit port nodes */}
+    </div>
+  )
+}
+
+export default memo(CustomGroupNode)

web/app/components/workflow/custom-group-node/index.ts

@@ -0,0 +1,19 @@
+export {
+  CUSTOM_GROUP_NODE,
+  CUSTOM_GROUP_INPUT_NODE,
+  CUSTOM_GROUP_EXIT_PORT_NODE,
+  GROUP_CHILDREN_Z_INDEX,
+  UI_ONLY_GROUP_NODE_TYPES,
+} from './constants'
+
+export type {
+  CustomGroupNodeData,
+  CustomGroupInputNodeData,
+  CustomGroupExitPortNodeData,
+  ExitPortInfo,
+  GroupMember,
+} from './types'
+
+export { default as CustomGroupNode } from './custom-group-node'
+export { default as CustomGroupInputNode } from './custom-group-input-node'
+export { default as CustomGroupExitPortNode } from './custom-group-exit-port-node'

web/app/components/workflow/custom-group-node/types.ts

@@ -0,0 +1,80 @@
+import type { BlockEnum } from '../types'
+
+/**
+ * Exit port info stored in Group node
+ */
+export type ExitPortInfo = {
+  portNodeId: string
+  leafNodeId: string
+  sourceHandle: string
+  name: string
+}
+
+/**
+ * Group node data structure
+ * node.type = 'custom-group'
+ * node.data.type = '' (empty string to bypass backend NodeType validation)
+ */
+export type CustomGroupNodeData = {
+  type: '' // Empty string bypasses backend NodeType validation
+  title: string
+  desc?: string
+  group: {
+    groupId: string
+    title: string
+    memberNodeIds: string[]
+    entryNodeIds: string[]
+    inputNodeId: string
+    exitPorts: ExitPortInfo[]
+    collapsed: boolean
+  }
+  width?: number
+  height?: number
+  selected?: boolean
+  _isTempNode?: boolean
+}
+
+/**
+ * Group Input node data structure
+ * node.type = 'custom-group-input'
+ * node.data.type = ''
+ */
+export type CustomGroupInputNodeData = {
+  type: ''
+  title: string
+  desc?: string
+  groupInput: {
+    groupId: string
+    title: string
+  }
+  selected?: boolean
+  _isTempNode?: boolean
+}
+
+/**
+ * Exit Port node data structure
+ * node.type = 'custom-group-exit-port'
+ * node.data.type = ''
+ */
+export type CustomGroupExitPortNodeData = {
+  type: ''
+  title: string
+  desc?: string
+  exitPort: {
+    groupId: string
+    leafNodeId: string
+    sourceHandle: string
+    name: string
+  }
+  selected?: boolean
+  _isTempNode?: boolean
+}
+
+/**
+ * Member node info for display
+ */
+export type GroupMember = {
+  id: string
+  type: BlockEnum
+  label?: string
+}