[feature] allow images to be displayed in output view and copilot view

[sinedied]

When using the generateImage() function, if you have the model to create markdown links to display the images, it will be blocked and not displayed.

In the output view, I once got a security prompt asking me if I wanted to show the blocked content, but despite allowing it images are never displayed. I noticed the URLs gets prefixed by sandbox: which may be related.

The same occurs in the Copilot output, though I got it working by adding manually the image link to the output like this:

env.output.appendContent(`![](${image.filename})`

Using this method the images gets displayed in Copilot window, but still not in the output view. When using this, I don't get the sandbox: prefix.

[github-actions]

This issue highlights a key inconsistency in how images are handled across the Output and Copilot views. The blocking of markdown links prefixed with sandbox: in the Output view, despite successfully displaying images by manually inserting the link as ![](${image.filename}) in the Copilot view, warrants further investigation. It’s crucial to understand why the sandbox: prefix causes blocking in one context but not the other. Further investigation should focus on the underlying mechanisms governing content display and security restrictions within the GenAIScript environment.

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[pelikhan]

I've been chasing this one... the preferred method should be

await output.image(...)

because I create a cached copy of the image.