feat(style-modal): expose Zigbee node types for customization

Add zigbee_coordinator, zigbee_router, zigbee_enddevice to the
CustomStyleModal editable list with Radio/Zap/Lightbulb icons so users
can tweak color, opacity, and size like any other node type.

frontend/src/components/modals/CustomStyleModal.tsx

@@ -3,6 +3,7 @@ import { toast } from 'sonner'
 import {
   Globe, Router, Network, Server, Layers, Box, Container, HardDrive,
   Cpu, Wifi, Camera, Printer, Monitor, PlugZap, Anchor, Package, Circle, Flame,
+  Radio, Zap, Lightbulb,
   type LucideIcon,
 } from 'lucide-react'
 import { Dialog, DialogContent, DialogHeader, DialogTitle } from '@/components/ui/dialog'
@@ -21,7 +22,8 @@ import { NODE_TYPE_LABELS, EDGE_TYPE_LABELS } from '@/types'
 const EDITABLE_NODE_TYPES: NodeType[] = [
   'isp', 'router', 'firewall', 'switch', 'server', 'proxmox', 'vm', 'lxc', 'nas',
   'iot', 'ap', 'camera', 'printer', 'computer', 'cpl', 'docker_host',
-  'docker_container', 'generic',
+  'docker_container', 'zigbee_coordinator', 'zigbee_router', 'zigbee_enddevice',
+  'generic',
 ]
 
 const EDITABLE_EDGE_TYPES: EdgeType[] = ['ethernet', 'wifi', 'iot', 'vlan', 'virtual', 'cluster']
@@ -30,7 +32,9 @@ const NODE_ICONS: Record<string, LucideIcon> = {
   isp: Globe, router: Router, firewall: Flame, switch: Network, server: Server, proxmox: Layers,
   vm: Box, lxc: Container, nas: HardDrive, iot: Cpu, ap: Wifi,
   camera: Camera, printer: Printer, computer: Monitor, cpl: PlugZap,
-  docker_host: Anchor, docker_container: Package, generic: Circle,
+  docker_host: Anchor, docker_container: Package,
+  zigbee_coordinator: Radio, zigbee_router: Zap, zigbee_enddevice: Lightbulb,
+  generic: Circle,
 }
 
 // ── Default style for a node type (from default theme) ─────────────────────