improvement: Add "left" and "right" to `position` argument in `show_code`

[Psirus]

📝 Summary

mo.show_code() has a position option that currently has two possible values, "above" and "below". For the Slides view it would be nice to have code and output side-by-side. This tries to add that.

🔍 Description of Changes

Basically just copied the cases for above/below and replaced the vstack with hstack. Not sure if this has implications I'm unaware of.

📋 Checklist

• [x] I have read the contributor guidelines.
• [ ] For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions (Please provide a link if applicable).
• [x] I have added tests for the changes made.
• [ ] I have run the code and verified that it works as expected.

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Name	Status	Preview	Comments	Updated (UTC)
marimo-docs	🛑 Canceled (Inspect)			Apr 1, 2025 8:30am
marimo-storybook	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 1, 2025 8:30am

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[Psirus]

I have read the CLA Document and I hereby sign the CLA

[mscolnick]

hey @Psirus - let me know if you are still interested in trying to get this merged in? we'd like to try to clean up some open PRs

[Psirus]

I still think it would be nice to have, but I have no clue about the marimo code base, nor any web development for that matter, nor the time to take care of this. So totally understandable if you just close it, also fine by me.