[Enhancement]: Optionally render markdown fences in model output

[leblancfg]

What features would you like to see added?

Even though the output of models is expected to be markdown, models will often output markdown fences with prose, e.g.

```md
# Header
*Some* ~text~
```

It would be useful to have a button left of the "copy" button in those code fences that renders it inline.

Which components are impacted by your request?

No response

Pictures

The output here is a very long single line – would be nice to be able to click a "preview" button here (I'm imagining just an "eye" icon) that would render it inline with the rest of the model output.

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