fix v1.33.4: device icon stays in place when rebinding or changing room

- rebinding migrates the layout position to the new marker id instead of
  recentering; room change within the same space keeps the position
  (owner's decision); new icons and cross-space moves still center
- smoke_marker_stay.mjs; TESTING/CHANGELOG same-commit

docs/CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## v1.33.4 — 2026-07-22
+- Editing a device no longer makes its icon jump. Changing the HA binding
+  (which changes the marker id) migrates the saved position to the new id;
+  changing the room within the same space keeps the icon exactly where it
+  stands (previously it re-centered in the new room). Only a brand-new icon,
+  or a move to a room in a different space, is centered.
+
 ## 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 /

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 stays on edit (v1.33.4): rebinding a device (HA device/entity) or
+      changing its room within the same space never moves the icon — the saved
+      or auto position migrates to the new marker id; only a brand-new icon or
+      a move to another space centers it in the target room [auto]
 - [ ] 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