feat(network): add GroupNode component with resize, inline label, and group type colors

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/components/network/nodes/GroupNode.tsx

@@ -0,0 +1,86 @@
+import { memo, useState, useRef, useEffect } from 'react'
+import { NodeProps, NodeResizer, useReactFlow } from '@xyflow/react'
+import type { GroupNodeData } from '@/types/network-diagram'
+
+const GROUP_COLORS: Record<string, string> = {
+  subnet: '#60a5fa',
+  vlan:   '#a78bfa',
+  site:   '#34d399',
+  dmz:    '#f87171',
+  custom: '#94a3b8',
+}
+
+const GroupNodeComponent = ({ data, selected, id }: NodeProps) => {
+  const groupData = data as GroupNodeData
+  const color = GROUP_COLORS[groupData.groupType] ?? GROUP_COLORS.custom
+  const [editing, setEditing] = useState(false)
+  const [labelValue, setLabelValue] = useState(groupData.label ?? '')
+  const inputRef = useRef<HTMLInputElement>(null)
+  const { updateNodeData } = useReactFlow()
+
+  useEffect(() => {
+    if (editing) inputRef.current?.focus()
+  }, [editing])
+
+  // Sync if external data.label changes
+  useEffect(() => {
+    if (!editing) setLabelValue(groupData.label ?? '')
+  }, [groupData.label, editing])
+
+  const handleLabelCommit = () => {
+    setEditing(false)
+    if (labelValue !== groupData.label) {
+      updateNodeData(id, { ...groupData, label: labelValue })
+    }
+  }
+
+  return (
+    <>
+      <NodeResizer
+        isVisible={selected}
+        minWidth={120}
+        minHeight={80}
+        lineStyle={{ border: `1px solid ${color}` }}
+        handleStyle={{ width: 8, height: 8, borderRadius: 2, background: color }}
+      />
+      <div
+        className="w-full h-full rounded-lg relative"
+        style={{
+          border: `1.5px dashed ${color}`,
+          background: `${color}0d`,
+          boxSizing: 'border-box',
+        }}
+      >
+        <div className="absolute top-0 left-0 -translate-y-full pb-0.5 pl-1">
+          {editing ? (
+            <input
+              ref={inputRef}
+              value={labelValue}
+              onChange={e => setLabelValue(e.target.value)}
+              onBlur={handleLabelCommit}
+              onKeyDown={e => {
+                if (e.key === 'Enter' || e.key === 'Escape') handleLabelCommit()
+                e.stopPropagation()
+              }}
+              className="text-[11px] font-medium bg-transparent border-none outline-none text-primary min-w-[40px] max-w-[200px]"
+              style={{ color }}
+            />
+          ) : (
+            <span
+              className="text-[11px] font-medium cursor-text select-none"
+              style={{ color }}
+              onDoubleClick={() => setEditing(true)}
+            >
+              {labelValue || groupData.groupType}
+            </span>
+          )}
+        </div>
+      </div>
+    </>
+  )
+}
+
+GroupNodeComponent.displayName = 'GroupNode'
+
+export const GroupNode = memo(GroupNodeComponent)
+export default GroupNode

frontend/src/components/network/nodes/nodeTypes.ts

@@ -1,5 +1,5 @@
 import { DeviceNode } from './DeviceNode'
-import { GroupNode } from '../ui/labeled-group-node'
+import { GroupNode } from './GroupNode'
 
 export const nodeTypes = {
   device: DeviceNode,

frontend/src/types/network-diagram.ts

@@ -123,6 +123,12 @@ export interface DiagramImportResponse {
   warnings: string[]
 }
 
+export interface GroupNodeData {
+  label: string
+  groupType: 'subnet' | 'vlan' | 'site' | 'dmz' | 'custom'
+  [key: string]: unknown
+}
+
 export interface DiagramExportResponse {
   schemaVersion: number
   name: string