Kiosk: tile per zone/room, not per device

Correction to the kiosk grid design (user, 2026-08-26): tiles now match the
Dashboard's ZoneCard -- one tile per room showing its TRV and AC together
(reusing ZoneCard's own rad-row/ac-block/fan-bar CSS), not a separate tile
per device. Selection/bulk-edit now operates on selected zones, gathering
every live device across them for KioskBulkPanel's type-aware sections.
Single-zone tap opens a modal listing that zone's device panels, mirroring
ZoneDetailModal's device loop minus the staff-only schedule/override UI.

- KioskZoneBlock.tsx replaces KioskDeviceBlock.tsx
- KioskZonePanel.tsx: new, one control panel per live device in a zone

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

frontend/src/components/KioskZonePanel.tsx

@@ -0,0 +1,27 @@
+import type { DeviceSummary } from '../types'
+import MhiControlPanel from './MhiControlPanel'
+import DaikinControlPanel from './DaikinControlPanel'
+import TrvControlPanel from './TrvControlPanel'
+
+// Single-zone edit modal content — one card per live device in this zone, each
+// with its normal control panel. Same "loop the zone's devices, render the
+// matching control panel" pattern as ZoneDetailModal.tsx, minus the staff-only
+// schedule/override sections (kiosk isn't for editing scheduling config).
+export default function KioskZonePanel({ devices }: { devices: DeviceSummary[] }) {
+  if (devices.length === 0) {
+    return <p className="muted">No live-controllable devices in this zone.</p>
+  }
+
+  return (
+    <div>
+      {devices.map(d => (
+        <div key={d.id} className="card">
+          <div style={{ fontWeight: 600, fontSize: 13 }}>{d.location || d.discovered_name || d.external_ref}</div>
+          {d.device_type === 'shelly_trv' && <TrvControlPanel deviceId={d.id} canControl={true} />}
+          {d.device_type === 'mhi_mqtt' && <MhiControlPanel deviceId={d.id} canControl={true} />}
+          {d.device_type === 'daikin' && <DaikinControlPanel deviceId={d.id} canControl={true} />}
+        </div>
+      ))}
+    </div>
+  )
+}