SEV-392: combobox setOptions() for reactive parent-fed option lists

Passing a parent component's reactive array into the nested combobox x-data
needs x-effect="setOptions(vpicMakes)" — a plain closure over the parent
scope doesn't track Alpine updates. Falls back to config.options for static
lists. 18/18 tests pass.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/combobox.test.js

@@ -54,3 +54,13 @@ test('empty query lists all options (capped) (SEV-392)', () => {
   c.query = '';
   assert.equal(c.filtered.length, 3);
 });
+
+test('setOptions feeds reactive option lists (SEV-392)', () => {
+  const c = comboboxData({ allowFree: true });
+  c.setOptions([]); // async source not loaded yet
+  assert.equal(c.filtered.length, 0);
+  c.setOptions(['BMW', 'Tesla']); // makes arrive
+  assert.equal(c.filtered.length, 2);
+  c.query = 'tes';
+  assert.deepEqual(c.filtered.map((o) => o.value), ['Tesla']);
+});