fix: approve devices onto the active design + Z-Wave node fields

Approve (single + bulk) created the canvas Node under the first design
instead of the design the user is viewing, so approved devices were
invisible on the active canvas and got wiped on the next save — and a
re-approve returned "0 approved" because the rows were already approved.

- bulk-approve now accepts design_id; the UI sends the active design.
- single approve already honoured design_id; the UI now sends it too.
- generalize the wireless branch (status=online, mesh props, no ICMP
  check) to Z-Wave as well as Zigbee, using build_zwave_properties.

ha-relevant: yes

frontend/src/api/__tests__/client.test.ts

@@ -186,7 +186,9 @@ describe('api/client', () => {
     mod.scanApi.ignore('d1')
     expect(api.post).toHaveBeenCalledWith('/scan/pending/d1/ignore')
     mod.scanApi.bulkApprove(['a', 'b'])
-    expect(api.post).toHaveBeenCalledWith('/scan/pending/bulk-approve', { device_ids: ['a', 'b'] })
+    expect(api.post).toHaveBeenCalledWith('/scan/pending/bulk-approve', { device_ids: ['a', 'b'], design_id: undefined })
+    mod.scanApi.bulkApprove(['a'], 'design-9')
+    expect(api.post).toHaveBeenCalledWith('/scan/pending/bulk-approve', { device_ids: ['a'], design_id: 'design-9' })
     mod.scanApi.bulkHide(['a'])
     expect(api.post).toHaveBeenCalledWith('/scan/pending/bulk-hide', { device_ids: ['a'] })
     mod.scanApi.restore('d1')