feat: search opening entity selectors

Issue: #301
User-Visible: yes

test/opening-entity-search.test.mjs

@@ -0,0 +1,44 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+import { filterOpeningEntityCandidates } from '../test-build/logic.js';
+
+const candidates = [
+  { value: 'binary_sensor.garage_contact', label: 'Garage Door' },
+  { value: 'binary_sensor.window_lounge', label: 'Living room' },
+  { value: 'binary_sensor.attic_motion', label: 'Attic Motion' },
+  { value: 'binary_sensor.side_window', label: 'Side window' },
+];
+
+test('opening entity search matches friendly name and preserves resolver order (#301)', () => {
+  assert.deepEqual(
+    filterOpeningEntityCandidates(candidates, 'window'),
+    [candidates[1], candidates[3]],
+  );
+  assert.deepEqual(filterOpeningEntityCandidates(candidates, ''), candidates);
+});
+
+test('opening entity search matches entity id even when the label does not (#301)', () => {
+  assert.deepEqual(
+    filterOpeningEntityCandidates(candidates, 'binary_sensor.window_lou'),
+    [candidates[1]],
+  );
+});
+
+test('opening entity search is case insensitive and trims edge whitespace (#301)', () => {
+  assert.deepEqual(
+    filterOpeningEntityCandidates(candidates, '  GARAGE door  '),
+    [candidates[0]],
+  );
+});
+
+test('opening entity search caps only after filtering (#301)', () => {
+  const many = Array.from({ length: 240 }, (_, index) => ({
+    value: `binary_sensor.window_${index}`,
+    label: index % 2 ? `Window ${index}` : `Other ${index}`,
+  }));
+  const result = filterOpeningEntityCandidates(many, 'window', 25);
+  assert.equal(result.length, 25);
+  assert.deepEqual(result, many.filter((item) =>
+    item.label.toLowerCase().includes('window') || item.value.includes('window')).slice(0, 25));
+});