refactor of usecases

apps/mobile/packages/design_system/lib/src/widgets/ui_text_field.dart

@@ -27,6 +27,7 @@ class UiTextField extends StatelessWidget {
     this.suffix,
     this.readOnly = false,
     this.onTap,
+    this.validator,
   });
   /// The label text to display above the text field.
   final String? label;
@@ -76,6 +77,9 @@ class UiTextField extends StatelessWidget {
   /// Callback when the text field is tapped.
   final VoidCallback? onTap;
 
+  /// Optional validator for the text field.
+  final String? Function(String?)? validator;
+
   @override
   Widget build(BuildContext context) {
     return Column(
@@ -86,18 +90,19 @@ class UiTextField extends StatelessWidget {
           Text(label!, style: UiTypography.body4m.textSecondary),
           const SizedBox(height: UiConstants.space1),
         ],
-        TextField(
+        TextFormField(
           controller: controller,
           onChanged: onChanged,
           keyboardType: keyboardType,
           maxLines: maxLines,
           obscureText: obscureText,
           textInputAction: textInputAction,
-          onSubmitted: onSubmitted,
+          onFieldSubmitted: onSubmitted,
           autofocus: autofocus,
           inputFormatters: inputFormatters,
           readOnly: readOnly,
           onTap: onTap,
+          validator: validator,
           style: UiTypography.body1r.textPrimary,
           decoration: InputDecoration(
             hintText: hintText,