fix[create]: 预览题目统一

- 预览题目跟随pc， 取 title 值

src/views/Design/components/Questions/MatrixQuestion.vue

@@ -28,7 +28,7 @@ const rows = defineModel<_questionOptionType[]>('rows', { required: false, defau
 // 列标签
 const cols = defineModel<_questionOptionType[]>('cols', { required: false, default: () => [] });
 // 题的序号
-const index = defineModel<number>('index', { required: false, default: 0 });
+const index = defineModel<number|string>('index', { required: false, default: 0 });
 // 是否是编辑状态
 const active = defineModel<boolean>('active', { required: false, default: false });