gouzi

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![Image](https://github.com/user-attachments/assets/85c7112b-2c92-485f-aa4c-cc58c456caa0) APP中并未丢失css

![4601e319b2c0fa050d3702ed8a1dd985](https://github.com/user-attachments/assets/143cfc7e-4e66-4a2d-8514-c41206ece06b) 添加一个`v-if` 就行了 支付宝渲染差异? 目前也不清楚

新增了`preview-cover` 来自定义扩展`file`样式