fix v1.33.3: icon picker shows the auto icon when none set

- marker dialog stores autoIcon (DevItem.icon); ha-icon-picker gets it
  as placeholder, fallback input too; 'Auto: mdi:...' hint with preview
  under the picker, hidden once an explicit icon is chosen
- smoke_icon_placeholder.mjs; TESTING/CHANGELOG same-commit

demo/smoke_icon_placeholder.mjs

@@ -0,0 +1,31 @@
+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;
+  c._setMode('devices'); await c.updateComplete;
+  // устройство без явной иконки (marker.icon пуст)
+  const dev = c._devices.find((d) => !d.marker?.icon && d.icon);
+  out.hasAutoDev = !!dev;
+  c._openMarkerDialog(dev); await c.updateComplete;
+  out.autoIconStored = c._markerDialog.autoIcon === dev.icon;
+  out.iconEmpty = c._markerDialog.icon === '';
+  // подсказка с авто-иконкой видна
+  const hint = sr().querySelector('.iconauto');
+  out.hintShown = !!hint && hint.textContent.includes(dev.icon);
+  out.hintIcon = hint?.querySelector('ha-icon')?.getAttribute('icon') === dev.icon;
+  // пикер (или фолбэк-инпут) получил placeholder
+  const picker = sr().querySelector('ha-icon-picker');
+  const inputs = [...sr().querySelectorAll('.dialog input')];
+  out.placeholderSet = picker
+    ? picker.placeholder === dev.icon
+    : inputs.some((i) => i.placeholder === dev.icon);
+  // при явной иконке подсказки нет
+  c._markerDialog = { ...c._markerDialog, icon: 'mdi:star' }; await c.updateComplete;
+  out.noHintWhenExplicit = !sr().querySelector('.iconauto');
+  c._markerDialog = null; await c.updateComplete;
+  return out;
+});
+console.log(JSON.stringify(res, null, 1));
+await browser.close();