fix: Select二级联动清空后重新选择label未更新#426
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在Select组件二级联动场景中，清空选择后再次选择时，二级选项的label仍显示上一次的值。 原因：optionLabel和filter方法中直接读取this.$el.textContent，DOM更新存在时序问题导致获取到旧值。 修复：新增searchLabel数据属性，在mounted/updated生命周期中同步更新，替代直接读取DOM文本。
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fix[Select]: 修复二级联动清空后二级选项label残留旧值问题
问题现象
二级联动场景清空选择，再次选择二级下拉，label仍显示上一次选中内容。
根因
optionLabel与filter直接读取this.$el.textContent，DOM异步更新时序问题获取旧DOM文本。
修复
新增searchLabel响应式变量，mounted/updated生命周期同步文本，替换DOM读取逻辑。
复现地址：https://run.iviewui.com/SjmmF1BX