Improved validation states and feedback components

[LarryVincent]

Description

I really appreciate the great work you’re doing on surveydown. I just fielded my first study with it (a baby one) and I felt so empowered being able to do everything programmatically. I have been wishing for this for years!

One suggestion I’d like to make is around validation notices. At the moment, if a user makes an error or something needs attention, they see a blocking pop-up alert. While that works functionally, it might be more user-friendly to implement inline form validation using Bootstrap’s built-in validation states and feedback components. Since surveydown already leverages Quarto, which relies heavily on Bootstrap and javascript, this would align nicely with the existing UI framework and provide a smoother, more consistent user experience.

You're building something great here. I would be happy to contribute if you need help in the future. I'm excited to launch my next study.

[jhelvy]

I made an issue out of this to work on it there #220