Add per-TRV control panel + valve/wifi telemetry, restyle dashboard radiator icon

Backend:
- New valve_position column, populated from shellies/<id>/info alongside
  wifi_rssi (was already a column, never actually written to).
- New GET/POST /api/devices/:id/trv-status and /trv-control routes, mirroring
  the mhi-status/mhi-control and daikin-status/daikin-control pattern. Control
  goes through the existing setTargetWithRetry() reliability pipeline.

Frontend:
- New TrvControlPanel.tsx: +/- setpoint control debounced 1s after the last
  click before firing a command (these are battery/deep-sleep valves going
  through a real retry/backoff pipeline, not a cheap register write like MHI/
  Daikin), plus room temp, valve position %, wifi signal, and a live "time
  since last update" readout. Wired into ZoneDetailModal for shelly_trv rows.
- ZoneCard dashboard tile: radiator icon now just shows red when heating_active
  (valve open) / grey when idle, with only the target setpoint alongside it
  (dropped the room-temp half, redundant with the zone-level temp line above).

frontend/src/api.ts

@@ -1,6 +1,6 @@
 import type {
   Zone, ZoneStatus, Device, DevicePhoto, ActivityEntry, NewbookSite, AppConfig,
-  MhiGateway, MhiStatus, ActiveAcTemplate, DaikinStatus,
+  MhiGateway, MhiStatus, ActiveAcTemplate, DaikinStatus, TrvStatus,
 } from './types'
 
 const BASE = '/hvac/api'
@@ -152,6 +152,14 @@ export function sendDaikinControl(deviceId: number, body: { onOff?: boolean; mod
   return request(`/devices/${deviceId}/daikin-control`, { method: 'POST', body: JSON.stringify(body) })
 }
 
+// TRV manual control (device-level — shelly_trv rows only)
+export function fetchTrvStatus(deviceId: number): Promise<TrvStatus> {
+  return request(`/devices/${deviceId}/trv-status`)
+}
+export function sendTrvControl(deviceId: number, body: { tempC: number }): Promise<{ ok: boolean }> {
+  return request(`/devices/${deviceId}/trv-control`, { method: 'POST', body: JSON.stringify(body) })
+}
+
 // Config / settings
 export function fetchConfig(): Promise<AppConfig> {
   return request('/config')

frontend/src/components/TrvControlPanel.tsx

@@ -0,0 +1,124 @@
+import { useEffect, useRef, useState } from 'react'
+import { Minus, Plus, RefreshCw, Loader2, Wifi, Gauge, Clock } from 'lucide-react'
+import { fetchTrvStatus, sendTrvControl } from '../api'
+
+const DEBOUNCE_MS = 1000
+const MIN_TEMP = 5
+const MAX_TEMP = 30
+
+function timeAgo(iso: string | null | undefined): string {
+  if (!iso) return 'never'
+  const ms = Date.now() - new Date(iso).getTime()
+  if (ms < 0) return 'just now'
+  const s = Math.floor(ms / 1000)
+  if (s < 60) return `${s}s ago`
+  const m = Math.floor(s / 60)
+  if (m < 60) return `${m}m ago`
+  const h = Math.floor(m / 60)
+  if (h < 24) return `${h}h ago`
+  return `${Math.floor(h / 24)}d ago`
+}
+
+// Manual setpoint control for one assigned Shelly TRV. +/- clicks update the
+// displayed value immediately but the MQTT command is debounced 1s after the last
+// click — these are battery/deep-sleep valves going through the full retry/backoff
+// pipeline (setTargetWithRetry), so rapid-fire clicking shouldn't fire a command per
+// click. Read side is push-populated (mqtt.js keeps the row fresh from
+// shellies/+/status + shellies/+/info), same "read the row" shape as Mhi/Daikin panels.
+export default function TrvControlPanel({ deviceId, canControl }: { deviceId: number; canControl: boolean }) {
+  const [loading, setLoading] = useState(true)
+  const [error, setError] = useState('')
+  const [applying, setApplying] = useState(false)
+
+  const [setpoint, setSetpoint] = useState(18)
+  const [roomTemp, setRoomTemp] = useState<number | null>(null)
+  const [valvePosition, setValvePosition] = useState<number | null>(null)
+  const [wifiRssi, setWifiRssi] = useState<number | null>(null)
+  const [lastSeen, setLastSeen] = useState<string | null>(null)
+
+  const debounceRef = useRef<ReturnType<typeof setTimeout> | null>(null)
+  const [, forceTick] = useState(0) // re-render periodically so "Xs ago" stays live
+
+  function load() {
+    setLoading(true); setError('')
+    fetchTrvStatus(deviceId)
+      .then(s => {
+        if (s.error) { setError(s.error); return }
+        if (s.setpoint != null) setSetpoint(s.setpoint)
+        setRoomTemp(s.roomTemp ?? null)
+        setValvePosition(s.valvePosition ?? null)
+        setWifiRssi(s.wifiRssi ?? null)
+        setLastSeen(s.statusUpdatedAt ?? s.lastSeen ?? null)
+      })
+      .catch(e => setError(e instanceof Error ? e.message : 'Failed to read device status'))
+      .finally(() => setLoading(false))
+  }
+  useEffect(load, [deviceId])
+
+  useEffect(() => {
+    const t = setInterval(() => forceTick(n => n + 1), 30000)
+    return () => clearInterval(t)
+  }, [])
+
+  useEffect(() => () => { if (debounceRef.current) clearTimeout(debounceRef.current) }, [])
+
+  async function apply(tempC: number) {
+    setApplying(true); setError('')
+    try {
+      const res = await sendTrvControl(deviceId, { tempC })
+      if (!res.ok) setError('Device did not accept the command')
+    } catch (e) {
+      setError(e instanceof Error ? e.message : 'Command failed')
+    } finally {
+      setApplying(false)
+    }
+  }
+
+  function adjust(delta: number) {
+    const next = Math.round(Math.min(MAX_TEMP, Math.max(MIN_TEMP, setpoint + delta)) * 2) / 2
+    setSetpoint(next)
+    if (debounceRef.current) clearTimeout(debounceRef.current)
+    debounceRef.current = setTimeout(() => apply(next), DEBOUNCE_MS)
+  }
+
+  if (loading) return <p className="muted" style={{ fontSize: 12.5 }}>Reading valve status…</p>
+
+  return (
+    <div style={{ marginTop: 8 }}>
+      {error && <div className="error-banner" style={{ marginBottom: 8 }}>{error}</div>}
+      <div style={{ display: 'flex', alignItems: 'center', gap: 10, flexWrap: 'wrap' }}>
+        <div style={{ display: 'flex', alignItems: 'center', gap: 4 }}>
+          <button className="btn btn-sm" disabled={!canControl} onClick={() => adjust(-0.5)}>
+            <Minus size={12} strokeWidth={1.75} />
+          </button>
+          <span style={{ minWidth: 48, textAlign: 'center', fontWeight: 600, fontSize: 13 }}>{setpoint.toFixed(1)}°C</span>
+          <button className="btn btn-sm" disabled={!canControl} onClick={() => adjust(0.5)}>
+            <Plus size={12} strokeWidth={1.75} />
+          </button>
+        </div>
+
+        {roomTemp != null && <span className="muted" style={{ fontSize: 12 }}>Room: {roomTemp.toFixed(1)}°C</span>}
+
+        {valvePosition != null && (
+          <span className="muted" style={{ fontSize: 12, display: 'inline-flex', alignItems: 'center', gap: 3 }}>
+            <Gauge size={13} strokeWidth={1.75} /> Valve {valvePosition}%
+          </span>
+        )}
+
+        {wifiRssi != null && (
+          <span className="muted" style={{ fontSize: 12, display: 'inline-flex', alignItems: 'center', gap: 3 }}>
+            <Wifi size={13} strokeWidth={1.75} /> {wifiRssi} dBm
+          </span>
+        )}
+
+        <span className="muted" style={{ fontSize: 12, display: 'inline-flex', alignItems: 'center', gap: 3 }}>
+          <Clock size={13} strokeWidth={1.75} /> {timeAgo(lastSeen)}
+        </span>
+
+        <button className="btn btn-sm" disabled={loading} onClick={load} title="Refresh live status">
+          {applying ? <Loader2 size={13} strokeWidth={1.75} className="spin" /> : <RefreshCw size={13} strokeWidth={1.75} />}
+        </button>
+      </div>
+    </div>
+  )
+}

frontend/src/components/ZoneCard.tsx

@@ -104,7 +104,7 @@ export default function ZoneCard({ zone, onClick }: { zone: ZoneStatus; onClick:
               {trvs.slice(0, 3).map(d => (
                 <div key={d.id} className={`rad-icon ${d.heating_active ? 'heating' : 'idle'}`}>
                   <Heater size={16} strokeWidth={1.75} />
-                  <span>{fmtTemp(d.current_target_temp)}/{fmtTemp(d.current_room_temp)}</span>
+                  <span>{fmtTemp(d.current_target_temp)}</span>
                 </div>
               ))}
             </div>

frontend/src/components/ZoneDetailModal.tsx

@@ -6,6 +6,7 @@ import { useAuth } from './AuthGate'
 import { updateZone, overrideZone, fetchActivity, fetchConfig } from '../api'
 import MhiControlPanel from './MhiControlPanel'
 import DaikinControlPanel from './DaikinControlPanel'
+import TrvControlPanel from './TrvControlPanel'
 
 // The 12 fields a room can individually override — each is `null` on the zone when
 // inheriting the matching field from the global hvac_defaults template (Settings page),
@@ -175,6 +176,7 @@ export default function ZoneDetailModal({ zone, onClose, onSaved }: {
             </div>
             {(d.device_type === 'mhi_modbus' || d.device_type === 'mhi_mqtt') && <MhiControlPanel deviceId={d.id} canControl={canControl} />}
             {d.device_type === 'daikin' && <DaikinControlPanel deviceId={d.id} canControl={canControl} />}
+            {d.device_type === 'shelly_trv' && <TrvControlPanel deviceId={d.id} canControl={canControl} />}
           </div>
         ))}
 

frontend/src/index.css

@@ -227,8 +227,8 @@ html, body, #root { height: 100%; margin: 0; font-size: 14px; }
 
 .rad-row { display: flex; gap: 10px; margin-top: 8px; flex-wrap: wrap; }
 .rad-icon { display: flex; align-items: center; gap: 3px; font-size: 10.5px; font-weight: 600; color: var(--text-mid); }
-.rad-icon.heating { color: var(--st-heating-up); }
-.rad-icon.idle     { color: var(--st-cooling-down); }
+.rad-icon.heating { color: var(--danger); }
+.rad-icon.idle     { color: var(--text-mid); }
 
 .ac-block { position: relative; display: flex; flex-direction: column; align-items: center; gap: 2px; padding-top: 4px; color: var(--text-dark); }
 .ac-block.off { color: var(--text-mid); opacity: .55; }

frontend/src/types.ts

@@ -93,6 +93,7 @@ export interface DeviceSummary {
   // via MQTT (mqtt.js); mhi_modbus populates the rest via the AC poller (ac-poller.js).
   current_room_temp: string | null
   heating_active: boolean | null
+  valve_position: number | null
   power_state: 'on' | 'off' | null
   current_mode: string | null
   fan_speed: string | null
@@ -189,6 +190,20 @@ export interface DaikinStatus {
   error?: string
 }
 
+export interface TrvStatus {
+  external_ref: string
+  setpoint?: number
+  roomTemp?: number
+  heatingActive?: boolean | null
+  valvePosition?: number | null
+  wifiRssi?: number | null
+  batteryPct?: number | null
+  targetOrigin?: string | null
+  lastSeen?: string | null
+  statusUpdatedAt?: string | null
+  error?: string
+}
+
 export interface DevicePhoto {
   id: number
   device_id: number