Preserve code editor settings

We should preserve any change users make on the [code editor](https://github.com/BeaconCMS/live_monaco_editor) and restore it on the next mount. For example if someone enables "word wrapping" then next time the editor is mounted it should preserve that option.

We can store such settings on the client side only, no need to preserve globally for example if the users open the code editor in another browser.

Start by reading the code editor integration linked in the issue and identify where editor options are applied during mounting. Verify the behavior by enabling word wrapping, unmounting and remounting the editor, and confirming that the setting is restored from client-side storage without affecting another browser.

Written by the indexing model from the issue text.