fix+ux v1.15.1: display-settings round from live usage

- comfort bounds: parseFloat+isFinite guard (empty input collapsed a bound to 0
  and the auto-swap made 'comfort from 25' behave as 0-25 → green at 24°)
- avg room temperature in the room tooltip (what the temp fill actually uses)
- hover darkens the current fill instead of recoloring blue; grey when unfilled
- fill mode as a radio group with short labels; compact inline bounds inputs
- space dialog widened to 500px; TESTING.md updated in the same commit

demo/repro_issue3.mjs

@@ -0,0 +1,25 @@
+// Репро №3: пользовательский путь — открыть диалог, выставить «комфорт от 25», сохранить
+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;
+  // living room: единственный термометр 22.4 → подменим на 24.0 как у пользователя
+  const h = window.__mkHass();
+  h.states = { ...h.states, 'sensor.living_temp': { ...h.states['sensor.living_temp'], state: '24.0' } };
+  c.hass = h; c._regSignature=''; c._maybeRebuildDevices(); await c.updateComplete;
+  // путь пользователя: диалог → режим temp, min=25 (макс не трогаем) → сохранить
+  c._openSpaceDialog('edit', 'f1'); await c.updateComplete;
+  out.dialogInit = { min: c._spaceDialog.tempMin, max: c._spaceDialog.tempMax, fill: c._spaceDialog.fillMode };
+  c._spaceDialog = { ...c._spaceDialog, fillMode: 'temp', tempMin: 25 };
+  await c._saveSpaceDialog(); await c.updateComplete;
+  const sp = c._serverCfg.spaces.find(s=>s.id==='f1');
+  out.savedSettings = sp.settings;
+  const styles = [...sr().querySelectorAll('.room.styled')].map(r => (r.getAttribute('style')||'').match(/--room-fill:([^;]+)/)?.[1]);
+  out.livingFill = styles[0];
+  out.expected = '#4fc3f7 (blue: 24 < 25)';
+  return out;
+});
+console.log(JSON.stringify(res, null, 1));
+await browser.close();