💡 [FEATURE] - Add validateOnBlur option to trigger validation on input blur

[isonnymichael]

Summary

Enable real-time validation by adding a validateOnBlur option so that inputs are validated as soon as they lose focus, not just on form submit.

Basic Example

validateForm('my-form', {
  validateOnBlur: true
});

• Adds blur event listener to each input
• Displays error message when input becomes invalid on blur
• Does not prevent submission validation
• Backward-compatible with no option passed

Additional context

No response