Add str in conversion to stop toml.type from being encoded and breaking markdown mode

[dmadisetti]

📝 Summary

Saving a new markdown file with a user specified default width, causes breakage since tomlkit loads wrapped types as opposed to raw python types. The result of saving or creating a new md notebook gives something like:

---
title: Example
marimo-version: 0.6.22
width: !!python/object/apply:tomlkit.items.String
- !!python/object/apply:tomlkit.items.StringType
  - '"'
- medium
- medium
- !!python/object:tomlkit.items.Trivia
  indent: ''
  comment_ws: ''
  comment: ''
  trail: '

    '
---

Ideally, you might consider casting config loads to be the raw python values.

To replicate, set your default to something that is not "compact". Then do marimo edit example.md (assuming example.md doesn't exist). Make a change, and try to save. View the raw file.

🔍 Description of Changes

Just run str on frontmatter inputs, this is safer, even if the toml config is properly converted.

📜 Reviewers

@akshayka OR @mscolnick

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[dmadisetti]

for reference: https://github.com/python-poetry/tomlkit/issues/43

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🚀 Development release published. You may be able to view the changes at https://marimo.app?v=0.6.23-dev1