fix: render styled canvas nodes for zwave types

The zwave_* node types were not registered in the React Flow nodeTypes
map, so imported Z-Wave devices fell back to the default unstyled node
(no icon, no accent). Add ZwaveCoordinator/Router/EndDevice node
components and register them. Adds a registry guard test.

ha-relevant: yes

frontend/src/components/canvas/nodes/__tests__/nodeTypes.test.ts

@@ -0,0 +1,15 @@
+import { describe, it, expect } from 'vitest'
+import { nodeTypes } from '../nodeTypes'
+
+describe('nodeTypes registry', () => {
+  it('registers a component for every wireless mesh node type', () => {
+    // Regression: zwave_* types were missing, so React Flow fell back to the
+    // default (unstyled) node — no icon, no accent. (Zigbee covered too.)
+    for (const t of [
+      'zigbee_coordinator', 'zigbee_router', 'zigbee_enddevice',
+      'zwave_coordinator', 'zwave_router', 'zwave_enddevice',
+    ]) {
+      expect(nodeTypes[t as keyof typeof nodeTypes], `missing nodeType: ${t}`).toBeDefined()
+    }
+  })
+})

frontend/src/components/canvas/nodes/index.tsx

@@ -1,7 +1,7 @@
 import { type NodeProps, type Node } from '@xyflow/react'
 import {
   Globe, Router, Network, Server, Layers, Box, Container,
-  HardDrive, Cpu, Wifi, Circle, Cctv, Printer, Monitor, Laptop, Smartphone, PlugZap, Anchor, Package, Flame, Radio, Antenna,
+  HardDrive, Cpu, Wifi, Circle, Cctv, Printer, Monitor, Laptop, Smartphone, PlugZap, Anchor, Package, Flame, Radio, Antenna, RadioTower, Share2,
   Grid3x3, Battery, Fuel, Sun, Repeat2, Split, ToggleLeft, Lightbulb, Gauge, Combine, Cable, Zap,
 } from 'lucide-react'
 import { BaseNode } from './BaseNode'
@@ -34,6 +34,11 @@ export const ZigbeeCoordinatorNode = (props: N) => <BaseNode {...props} icon={Ne
 export const ZigbeeRouterNode      = (props: N) => <BaseNode {...props} icon={Radio} />
 export const ZigbeeEndDeviceNode   = (props: N) => <BaseNode {...props} icon={Antenna} />
 
+// Z-Wave node types
+export const ZwaveCoordinatorNode = (props: N) => <BaseNode {...props} icon={RadioTower} />
+export const ZwaveRouterNode      = (props: N) => <BaseNode {...props} icon={Share2} />
+export const ZwaveEndDeviceNode   = (props: N) => <BaseNode {...props} icon={Antenna} />
+
 // Electrical node types
 export const GridNode          = (props: N) => <BaseNode {...props} icon={Grid3x3} />
 export const UpsNode           = (props: N) => <BaseNode {...props} icon={Battery} />

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

@@ -3,6 +3,7 @@ import {
   NasNode, IotNode, ApNode, CameraNode, PrinterNode, ComputerNode, LaptopNode,
   MobileNode, CplNode, DockerHostNode, DockerContainerNode, GenericNode,
   ZigbeeCoordinatorNode, ZigbeeRouterNode, ZigbeeEndDeviceNode,
+  ZwaveCoordinatorNode, ZwaveRouterNode, ZwaveEndDeviceNode,
   GridNode, UpsNode, BatteryNode, GeneratorNode, SolarPanelNode, InverterNode,
   CircuitBreakerNode, ContactorNode, ElectricalSwitchNode, SocketNode,
   LightNode, MeterNode, TransformerNode, LoadNode,
@@ -39,6 +40,9 @@ export const nodeTypes = {
   zigbee_coordinator: ZigbeeCoordinatorNode,
   zigbee_router: ZigbeeRouterNode,
   zigbee_enddevice: ZigbeeEndDeviceNode,
+  zwave_coordinator: ZwaveCoordinatorNode,
+  zwave_router: ZwaveRouterNode,
+  zwave_enddevice: ZwaveEndDeviceNode,
   grid: GridNode,
   ups: UpsNode,
   battery: BatteryNode,