feat v1.15.0: temperature room fill (blue/green/yellow) with editable comfort bounds

- fill_mode 'temp': below comfort → #4fc3f7, inside → #66d17a, above → #ffd45c;
  bounds default 20-25°C, editable in the space dialog (visible only for this
  mode), swapped bounds tolerated; rooms without a temperature reading unfilled
- areaTemp(): average of the area devices' temperatures
- tests: roomFillColor temp bands + bounds, spaceDisplayOf defaults, areaTemp,
  backend schema (fill_mode temp + temp_min/temp_max); smoke_temp_fill.mjs
- TESTING.md updated in the same commit (policy)

demo/smoke_temp_fill.mjs

@@ -0,0 +1,30 @@
+import { launch } from './serve.mjs';
+const { page, browser } = await launch();
+const res = await page.evaluate(async () => {
+  const out = {};
+  const c = window.__card;
+  const sr = () => c.shadowRoot || c.renderRoot;
+  const setFill = async (settings) => {
+    c._serverCfg = { ...c._serverCfg, spaces: c._serverCfg.spaces.map((s) => s.id !== 'f1' ? s : ({ ...s, settings })) };
+    c.requestUpdate(); await c.updateComplete;
+    return [...sr().querySelectorAll('.room.styled')].map((r) => {
+      const st = r.getAttribute('style') || '';
+      const m = st.match(/--room-fill:([^;]+)/);
+      return m ? m[1] : null;
+    });
+  };
+  // living room avg temp = 22.4 (единственный термометр в demo)
+  out.comfy = await setFill({ show_borders: true, fill_mode: 'temp', temp_min: 20, temp_max: 25 });
+  out.cold = await setFill({ show_borders: true, fill_mode: 'temp', temp_min: 23, temp_max: 26 });
+  out.hot  = await setFill({ show_borders: true, fill_mode: 'temp', temp_min: 18, temp_max: 21 });
+  out.swapped = await setFill({ show_borders: true, fill_mode: 'temp', temp_min: 25, temp_max: 20 });
+  // диалог: поля границ видны только в режиме temp
+  c._openSpaceDialog('edit', 'f1'); await c.updateComplete;
+  out.dialogTempFields = sr().querySelectorAll('.tempin').length;
+  c._spaceDialog = { ...c._spaceDialog, fillMode: 'none' }; await c.updateComplete;
+  out.dialogHiddenWhenNone = sr().querySelectorAll('.tempin').length;
+  c._spaceDialog = null;
+  return out;
+});
+console.log(JSON.stringify(res, null, 1));
+await browser.close();