feat v1.14.0: per-space display settings, hand-drawn spaces, manual-testing checklist

- space dialog 'Display' section: room borders/names toggles, color+opacity,
  fill by zigbee signal or lights (tri-state: on/off/no-lights)
- draggable room name labels persisted as layout rl_<roomId>
- 'no image, outline by hand' space source with canvas orientation; image
  optional now; switching an existing space to draw detaches its plan
- demo/ synthetic-home harness lives in the repo (serve.mjs + smokes + icons gen)
- docs/TESTING.md checklist (same-commit update policy); self-run found and
  fixed: plan_url not detached on image->draw, _stateClass crash on states
  without entity_id; perf measured (162 devices ~14ms build)
- backend: SPACE_DISPLAY_SCHEMA validation (+test)

src/devices.ts

@@ -292,3 +292,20 @@ export function buildDevices(ctx: BuildCtx): DevItem[] {
   }
   return rest;
 }
+
+/**
+ * Light situation of an area: 'on' if any light entity of the area's devices is on,
+ * 'off' if lights exist but none is on, 'none' when the area has no lights at all.
+ */
+export function areaLights(hass: any, devices: { area: string; entities: string[] }[], area: string): 'on' | 'off' | 'none' {
+  let seen = false;
+  for (const d of devices) {
+    if (d.area !== area) continue;
+    for (const eid of d.entities) {
+      if (!eid.startsWith('light.')) continue;
+      seen = true;
+      if (hass.states[eid]?.state === 'on') return 'on';
+    }
+  }
+  return seen ? 'off' : 'none';
+}