Enable Advanced classic group preview

tests/coalition-preview-controls.test.tsx

@@ -61,3 +61,12 @@ void test('selected preview warns in the lobby and through real setup', () => {
     assert.match(html,/Some faction powers and interactions are incomplete/);
   }
 });
+
+void test('Advanced group preview keeps the explicit opt-in and incompatibility warning', () => {
+  let game = applyAction(lobby(),'at',{type:'coalitionPreview',variant:'three'});
+  game = applyAction(game,'at',{type:'rules',advanced:true});
+  const html = table(viewGame(game,'at'));
+  assert.match(html,/Advanced rules require their separate preview start/);
+  assert.match(html,/without expansion decks, other optional modules/);
+  assert.match(html,/Begin Advanced preview/);
+});