feat: group node types by category in Custom Style editor

The Custom Style modal listed node types as a flat list. It now groups
them under category headers (Hardware, Virtualization, IoT, Zigbee,
Z-Wave, Personal, Generic) like the Add/Edit Node modal, and exposes the
Z-Wave node types for styling.

ha-relevant: yes

frontend/src/components/modals/CustomStyleModal.tsx

@@ -1,9 +1,9 @@
-import { useState, useCallback } from 'react'
+import { Fragment, useState, useCallback } from 'react'
 import { toast } from 'sonner'
 import {
   Globe, Router, Network, Server, Layers, Box, Container, HardDrive,
   Cpu, Wifi, Camera, Printer, Monitor, Laptop, Smartphone, PlugZap, Anchor, Package, Circle, Flame,
-  Radio, Zap, Lightbulb,
+  Radio, Zap, Lightbulb, RadioTower, Share2,
   type LucideIcon,
 } from 'lucide-react'
 import { Dialog, DialogContent, DialogHeader, DialogTitle } from '@/components/ui/dialog'
@@ -17,13 +17,16 @@ import type {
 } from '@/types'
 import { NODE_TYPE_LABELS, EDGE_TYPE_LABELS } from '@/types'
 
-// ── Node types exposed for custom style (skip groupRect/group) ───────────────
+// ── Node types exposed for custom style, grouped by category (skip groupRect/group) ──
 
-const EDITABLE_NODE_TYPES: NodeType[] = [
-  'isp', 'router', 'firewall', 'switch', 'server', 'proxmox', 'vm', 'lxc', 'nas',
-  'iot', 'ap', 'camera', 'printer', 'computer', 'laptop', 'mobile', 'cpl', 'docker_host',
-  'docker_container', 'zigbee_coordinator', 'zigbee_router', 'zigbee_enddevice',
-  'generic',
+const NODE_TYPE_GROUPS: { label: string; types: NodeType[] }[] = [
+  { label: 'Hardware',       types: ['isp', 'router', 'firewall', 'switch', 'server', 'nas', 'ap', 'printer'] },
+  { label: 'Virtualization', types: ['proxmox', 'vm', 'lxc', 'docker_host', 'docker_container'] },
+  { label: 'IoT',            types: ['iot', 'camera', 'cpl'] },
+  { label: 'Zigbee',         types: ['zigbee_coordinator', 'zigbee_router', 'zigbee_enddevice'] },
+  { label: 'Z-Wave',         types: ['zwave_coordinator', 'zwave_router', 'zwave_enddevice'] },
+  { label: 'Personal',       types: ['computer', 'laptop', 'mobile'] },
+  { label: 'Generic',        types: ['generic'] },
 ]
 
 const EDITABLE_EDGE_TYPES: EdgeType[] = ['ethernet', 'wifi', 'iot', 'vlan', 'virtual', 'cluster', 'fibre', 'electrical']
@@ -34,6 +37,7 @@ const NODE_ICONS: Record<string, LucideIcon> = {
   camera: Camera, printer: Printer, computer: Monitor, laptop: Laptop, mobile: Smartphone, cpl: PlugZap,
   docker_host: Anchor, docker_container: Package,
   zigbee_coordinator: Radio, zigbee_router: Zap, zigbee_enddevice: Lightbulb,
+  zwave_coordinator: RadioTower, zwave_router: Share2, zwave_enddevice: Lightbulb,
   generic: Circle,
 }
 
@@ -363,34 +367,41 @@ export function CustomStyleModal({ open, onClose }: CustomStyleModalProps) {
 
             {/* Type list */}
             <div className="flex-1 overflow-y-auto py-1">
-              {tab === 'nodes' && EDITABLE_NODE_TYPES.map((t) => {
-                const Icon = NODE_ICONS[t] ?? Circle
-                const style = draft.nodes[t]
-                const isSelected = selection?.kind === 'node' && selection.type === t
-                const swatchColor = style
-                  ? applyOpacity(style.borderColor, style.borderOpacity)
-                  : THEMES.default.colors.nodeAccents[t]?.border ?? '#8b949e'
+              {tab === 'nodes' && NODE_TYPE_GROUPS.map((group) => (
+                <Fragment key={group.label}>
+                  <div className="px-3 pt-2 pb-1 text-[10px] font-semibold uppercase tracking-wider text-[#8b949e]/60">
+                    {group.label}
+                  </div>
+                  {group.types.map((t) => {
+                    const Icon = NODE_ICONS[t] ?? Circle
+                    const style = draft.nodes[t]
+                    const isSelected = selection?.kind === 'node' && selection.type === t
+                    const swatchColor = style
+                      ? applyOpacity(style.borderColor, style.borderOpacity)
+                      : THEMES.default.colors.nodeAccents[t]?.border ?? '#8b949e'
 
-                return (
-                  <button
-                    key={t}
-                    type="button"
-                    onClick={() => setSelection({ kind: 'node', type: t })}
-                    className="w-full flex items-center gap-2 px-3 py-2 text-xs transition-colors text-left"
-                    style={{
-                      background: isSelected ? '#21262d' : 'transparent',
-                      color: isSelected ? '#e6edf3' : '#8b949e',
-                    }}
-                  >
-                    <Icon size={13} />
-                    <span className="flex-1 truncate">{NODE_TYPE_LABELS[t]}</span>
-                    <span
-                      className="w-2.5 h-2.5 rounded-full shrink-0"
-                      style={{ background: swatchColor }}
-                    />
-                  </button>
-                )
-              })}
+                    return (
+                      <button
+                        key={t}
+                        type="button"
+                        onClick={() => setSelection({ kind: 'node', type: t })}
+                        className="w-full flex items-center gap-2 px-3 py-2 text-xs transition-colors text-left"
+                        style={{
+                          background: isSelected ? '#21262d' : 'transparent',
+                          color: isSelected ? '#e6edf3' : '#8b949e',
+                        }}
+                      >
+                        <Icon size={13} />
+                        <span className="flex-1 truncate">{NODE_TYPE_LABELS[t]}</span>
+                        <span
+                          className="w-2.5 h-2.5 rounded-full shrink-0"
+                          style={{ background: swatchColor }}
+                        />
+                      </button>
+                    )
+                  })}
+                </Fragment>
+              ))}
 
               {tab === 'edges' && EDITABLE_EDGE_TYPES.map((t) => {
                 const style = draft.edges[t]

frontend/src/components/modals/__tests__/CustomStyleModal.test.tsx

@@ -37,6 +37,16 @@ describe('CustomStyleModal', () => {
     expect(screen.getByText(/edge type from the list/i)).toBeDefined()
   })
 
+  it('groups node types under category headers (incl. Zigbee and Z-Wave)', () => {
+    render(<CustomStyleModal open onClose={vi.fn()} />)
+    expect(screen.getByText('Hardware')).toBeDefined()
+    expect(screen.getByText('Zigbee')).toBeDefined()
+    expect(screen.getByText('Z-Wave')).toBeDefined()
+    // A Z-Wave node type is selectable from its category.
+    fireEvent.click(screen.getByRole('button', { name: /Z-Wave Controller/ }))
+    expect(screen.getByText(/Apply to existing Z-Wave Controller/)).toBeDefined()
+  })
+
   it('selecting a node type opens the node editor', () => {
     render(<CustomStyleModal open onClose={vi.fn()} />)
     fireEvent.click(screen.getByRole('button', { name: 'Router' }))