add loading indicator for the form submit button

[atmonshi]

No description provided.

[what-the-diff]

PR Summary

• Added New Submit Button to Form
  The form file was updated with a new "Save" button. This facilitates a smoother and more efficient mechanism for users to submit their data. This change is a user interface enhancement that improves overall usability.

• Dynamic Color Customization for Button
  The color of this new "Save" button will be determined based on the chosen primary color settings. It means the look and feel of the button will align with the broader design scheme of the application. This enhances the aesthetic consistency, thereby improving the overall user experience.