Implement Slide Delimiter field

[alkrauss48]

Currently, each slide breaks on a double newline (either \n\n or \r\n - as seen in resources/js/store/dataStore.tsL17-18)

I'd like to add a field in Filament when creating a presentation called Slide Delimiter, which is a dropdown with 2 options:

• Double New Line (default)
• 3 Dashes (---)

This involves:

• Creating a migration for slide_delimiter on the presentations as a non-nullable string, with a default value of \n\n
• Creating an enum for the possible values (listed above)
• Casting the enum to the slide_delimiter property on the Presentation model
• Updating the PresentationFactory with the new field w/ default value
• Adding a Select field on the sidebar of the PresentationResource in Filament, using that enum for the options
• Sending the value of that property on the PresentationController#show action, via a slideDelimiter Inertia property
• Accepting that property on resources/js/Pages/Slide.ts, and setting that on the dataStore as a new property
  • Set a default value of the prop to \n\n
• Using that new field in the dataStore processData function, when splitting the content into slides.

Optional - Add Tests

This task is a bit challenging as it is, so tests can be added later for this. But if you would like to add tests, then consider adding:

• Back-end tests for the PresentationResourceTest, when creating a presentation
• Back-end tests in PresentationControllerTest using assertInertia of the properties
• Front-end tests for the slide page and/or dataStore

I'd put the new field between the Description and Thumbnail fields: