ux v1.38.0: binding section — radios + entities checkbox + dropdown

- Virtual / Pick-from-HA radios; Show-entities checkbox with tooltip
  gates device entities (groups/helpers always listed); searchable
  dropdown only in HA mode, auto-opens when empty, closes on pick;
  Save guarded until a binding is chosen; logic untouched
- smoke_binding_ui.mjs (16 checks); marker_stay/controls smokes green;
  TESTING/CHANGELOG same-commit

docs/CHANGELOG.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## v1.38.0 — 2026-07-23 (binding section redesign)
+- The device dialog's binding section is compact now: two radio buttons —
+  **Virtual device** and **Pick from the HA list** — with a **Show entities**
+  checkbox (adds every entity of the devices to the list; groups and helpers
+  are always listed). The searchable dropdown appears only in HA mode and
+  collapses once you pick. Save is disabled until a binding is chosen.
+  The binding logic itself is unchanged.
+
 ## v1.37.3 — 2026-07-23
 - Open boundaries now render as a **true dash**: the rooms' solid outlines are
   trimmed under the open stretch (outlineWithout) instead of dashes being

docs/TESTING.md

@@ -140,6 +140,12 @@ 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
+- [ ] Binding section redesign (v1.38.0): two radios — Virtual / Pick from
+      the HA list — with a "Show entities" checkbox (tooltip) next to the
+      second; the dropdown (search inside) appears only in HA mode, opens
+      itself when nothing is chosen, closes on pick; Save is blocked until a
+      binding is chosen in HA mode; groups/helpers listed always, device
+      entities only with the checkbox; editing pre-selects everything [auto]
 - [ ] True dashed boundary (v1.37.3): the open stretch is a REAL dash — the
       rooms' solid strokes are trimmed out beneath it (hover doesn't bring
       them back), walls elsewhere stay solid; the dashes render ABOVE the