feat v1.31.0: room cards — metrics line + proportional resize

- room label becomes a card: name on top, optional metrics below
  (temperature / humidity / avg zigbee / lights), four checkboxes in
  space settings, all off by default; lights render On/Off or '1 of 3'
- areaHum + areaLightStats pure helpers (+3 unit tests, 90 total)
- resize via corner handles in the Plan editor (hover), uniform 0.5-3x,
  scale stored as layout k next to the position; drag preserves it
- fix latent v1.25 regression: draggable HTML labels were never rendered
  in the Plan editor (static SVG only) — real name-only cards now render
  there, draggable and resizable
- repair merge/split smokes still calling removed _toggleMarkup
- validation.py: 4 label_* bools; smoke_room_cards.mjs; docs same-commit

test/devices.test.mjs

@@ -1,6 +1,6 @@
 import test from 'node:test';
 import assert from 'node:assert/strict';
-import { buildDevices, lightGroups, primaryEntity, lqiFor, tempFor, humFor, areaLights, areaTemp } from '../test-build/devices.js';
+import { buildDevices, lightGroups, primaryEntity, lqiFor, tempFor, humFor, areaLights, areaTemp, areaHum, areaLightStats } from '../test-build/devices.js';
 import { compileIconRules } from '../test-build/rules.js';
 
 /** Minimal fake hass around the pieces buildDevices reads. */
@@ -280,3 +280,32 @@ test('buildDevices: humidity badge is gated on device_class, not the icon (name
   assert.notEqual(d.icon, 'mdi:water-percent'); // name rule won the icon
   assert.equal(d.hum, 45); // …but the humidity value is still shown (gated on device_class)
 });
+
+test('areaLightStats: counts unique lights that are on', () => {
+  const hass = { states: {
+    'light.a': { state: 'on' }, 'light.b': { state: 'off' }, 'light.c': { state: 'on' },
+  } };
+  const devs = [
+    { area: 'living', entities: ['light.a', 'sensor.x'] },
+    { area: 'living', entities: ['light.b', 'light.a'] }, // light.a duplicated on purpose
+    { area: 'other', entities: ['light.c'] },
+  ];
+  assert.deepEqual(areaLightStats(hass, devs, 'living'), { on: 1, total: 2 });
+  assert.deepEqual(areaLightStats(hass, devs, 'other'), { on: 1, total: 1 });
+  assert.equal(areaLightStats(hass, devs, 'empty'), null);
+});
+
+test('areaHum: averages climate sensors only, integer %', () => {
+  const hass = { states: {
+    'sensor.t1_humidity': { state: '41', attributes: { device_class: 'humidity', unit_of_measurement: '%' } },
+    'sensor.t2_humidity': { state: '46', attributes: { device_class: 'humidity', unit_of_measurement: '%' } },
+    'sensor.fridge_humidity': { state: '90', attributes: { device_class: 'humidity', unit_of_measurement: '%' } },
+  } };
+  const devs = [
+    { area: 'living', icon: 'mdi:thermometer', entities: ['sensor.t1_humidity'] },
+    { area: 'living', icon: 'mdi:air-filter', entities: ['sensor.t2_humidity'] },
+    { area: 'living', icon: 'mdi:fridge', entities: ['sensor.fridge_humidity'] }, // curated out
+  ];
+  assert.equal(areaHum(hass, devs, 'living'), 44);
+  assert.equal(areaHum(hass, devs, 'nothing'), null);
+});