feat(ui): render the ORBIT indicator from the location tray

LocationControls offers the indicator with showOrbit(active) in its
presented tray instead of building it on the body, and the scene chrome
teleports it there. Orbit toggles, including the voice switch, light it
through the controls.

src/ui/locationControls.test.mjs

@@ -65,7 +65,6 @@ function fixture() {
   };
   const doc = node();
   doc.createElement = node;
-  doc.body = node();
   const cities = {
     a: { name: 'City A', pois: [{ name: 'First' }, { name: 'Second' }] },
     b: { name: 'City B', pois: [{ name: 'Elsewhere' }] },
@@ -108,6 +107,7 @@ test('the tray presents its cities, empty status and no landmarks at first', ()
     poisExpanded: false,
     status: { city: '📍 Location: --', poi: 'Landmark: --' },
     searchError: null,
+    orbit: null,
   });
   f.controls.highlightCity('b');
   assert.deepEqual(
@@ -155,11 +155,13 @@ test('replacing POIs routes clicks to the final row and expands it a frame later
 test('destruction revokes document, search, reset, city and POI actions and removes orbit UI', () => {
   const f = fixture();
   f.controls.showPois('a');
-  f.controls.createOrbitIndicator();
-  assert.equal(f.doc.body.children.length, 1);
+  f.controls.showOrbit(true);
+  assert.deepEqual(f.view().orbit, { active: true });
   f.controls.destroy();
+  assert.equal(f.view().orbit, null);
   f.controls.destroy();
   const published = f.views.length;
+  f.controls.showOrbit(true);
   f.controls.chooseCity('a');
   f.controls.choosePoi(0);
   f.controls.highlightCity('a');
@@ -170,7 +172,6 @@ test('destruction revokes document, search, reset, city and POI actions and remo
   f.frames.get(0)();
   assert.deepEqual(f.calls, []);
   assert.equal(f.views.length, published);
-  assert.equal(f.doc.body.children.length, 0);
 });
 test('the mini status shows the city, a landmark or a searched place', () => {
   const f = fixture();