Fix playground AST views w/ clone

[Jokcy]

const capture = (name) => () => (tree) => {
        file.data[name] = tree
      }

In our playground page, we use capture in remarkPlugins and rehypePlugins to capture the ast on different step. But after generate the mdast or hast, the evaluate function will keep going and later plugins will do some mutation on the ast object, which result to what we showed to user of mdast/hast in not correct on that step. So I just structuredClone the ast as a snapshot when capture and then save to file.

When compile <A b={<B><C /></B>}></A>, this mr generate <C /> as JSXElement, the old version generate as CallExpression with callee of _jsx.

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
mdx	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 26, 2023 4:33am

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (7504cfb) 100.00% compared to head (94026da) 100.00%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2315 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 22 22 Lines 2177 2177 ========================================= Hits 2177 2177 ```

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[wooorm]

Thank you! :)