feat(angular): add support signal forms

[luisbytes]

Prerequisites

• [x] I have read the Contributing Guidelines.
• [x] I agree to follow the Code of Conduct.
• [x] I have searched for existing issues that already include this feature request, without success.

Describe the Feature Request

Angular now provides Signal-based Forms as a modern, reactive alternative to traditional ReactiveFormsModule. Many projects are starting to adopt the new API.

Currently, @ionic/angular components are optimized around the classic reactive forms model, and some form-related components or directives don’t integrate seamlessly with Signal Forms.

Describe the Use Case

Apps using the new Angular Signal Forms cannot fully integrate with Ionic form components without fallbacks or extra wrappers.

Describe Preferred Solution

No response

Describe Alternatives

No response

Related Code

No response

Additional Information

It would be very useful for Ionic components to work seamlessly with the new Signal Forms API—being able to mark inputs as touched/invalid and display error messages just like with Reactive Forms. This would provide a consistent developer experience when building forms in Angular.

More details can be found here: https://angular.dev/guide/forms/signals/custom-controls