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

src/styles.ts

@@ -396,6 +396,14 @@ export const cardStyles = css`
       display: inline-flex;
     }
     .roomlabel .rlm.lit { opacity: 1; }
+    .iconauto {
+      display: flex;
+      align-items: center;
+      gap: 6px;
+      font-size: 12px;
+      margin: 4px 0 0;
+    }
+    .iconauto ha-icon { --mdc-icon-size: 18px; }
     .rlhandle {
       display: none;
       position: absolute;