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

docs/CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## v1.33.3 — 2026-07-22
+- Device dialog: when no icon is set explicitly, the icon picker no longer
+  looks empty — it shows the **auto-derived icon** (from the icon rules /
+  device class) as a placeholder, with an "Auto: mdi:…" hint line underneath.
+  Picking an explicit icon replaces it as before; clearing returns to auto.
+
 ## v1.33.2 — 2026-07-22
 - Removed the **Reset** button from the Device editor. It wiped the entire
   layout — positions of all devices, room cards and their scales across every

docs/TESTING.md

@@ -140,6 +140,10 @@ Run the *core flows* (marked ★ below) in each environment at least once per mi
       (explicit ripple color still wins); off/white lights unchanged [auto]
 - [ ] Alarm pulse (v1.27.0): leak/smoke/gas/CO/siren in 'on' pulse a red ring over any
       display mode; clears on 'off'; unavailable never alarms [auto]; reduced-motion static
+- [ ] Icon picker placeholder (v1.33.3): with no explicit icon the device
+      dialog's icon picker shows the auto-derived icon as its placeholder, plus
+      an "Auto: mdi:..." hint line with the icon preview; the hint disappears
+      once an explicit icon is picked [auto]
 - [ ] No Reset button (v1.33.2): the Device editor toolbar has three tools —
       add, show all, icon rules; the layout-wiping Reset is gone [auto]
 - [ ] Grid in all editors + decor fade (v1.33.1): the dot grid shows in the