Fix: form validation bugs

[honuuk]

fix: #55 #56 #59

The following changes were made. There are also some parts where the code was slightly refined.
Please check it out.

Changes

• re-initialize useForm defaultValues when formFields change
• fix input validation bug (e.g., allowing empty text in required inputs)
• fix incorrect form default values

[vercel]

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[honuuk]

@hasanharman
Hi, Hasan. Could you please review my PR when you have a moment?

I've noticed that the project hasn't been updated recently. I understand you might be busy.
Given the current situation, would you consider adding me as a maintainer for this project? I'd be happy to help keep things moving forward.

Also, if you have a preferred communication tool, please let me know. It would be great to have a direct line of contact for any project-related discussions.

[hasanharman]

Awesome work thank you!

[hasanharman]

I took a break and come back yet! That is a great contribution thanks for your help and great work