Feature: 沙盒里的图片不能保存不能复制

### Describe the problem related to the feature request

在调试发送图片的插件时，无法放大观察图片细节

### Describe the solution you'd like

图片可点击放大，右键可保存图片

### Describe alternatives you've considered

_No response_

### Additional context

_No response_

Start by locating the sandbox image-rendering entry point in this WebUI repository and reproduce the plugin debugging case. Verify that clicking an image opens a larger view and that the browser context menu permits saving it.

Written by the indexing model from the issue text.