feat: refactor SDUI widget model to use sealed classes for type-safe handling, enhance form widget with stepper support, and improve error handling in SDUIFormWidget

packages/chicken/lib/presentation/widget/sdui/widgets/stepper/stepper_sdui.dart

@@ -15,14 +15,14 @@ class StepperSDUI extends StatelessWidget {
     return Obx(() {
       final activeStep = state?[model.key] as int? ?? model.activeStep ?? 0;
 
-      return Directionality(
-        textDirection: TextDirection.ltr,
-        child: SizedBox(
-          height: 24,
-          width: Get.width,
-          child: Row(
-            mainAxisAlignment: MainAxisAlignment.spaceBetween,
-            children: _buildSteps(totalSteps, activeStep),
+      return SingleChildScrollView(
+        scrollDirection: Axis.horizontal,
+        child: Directionality(
+          textDirection: TextDirection.ltr,
+          child: SizedBox(
+            height: 30.h,
+            width: Get.width,
+            child: Row(children: _buildSteps(totalSteps, activeStep)),
           ),
         ),
       );
@@ -58,7 +58,8 @@ class StepperSDUI extends StatelessWidget {
       // Add divider between steps (except after last step)
       if (i < totalSteps - 1) {
         widgets.add(
-          Expanded(
+          SizedBox(
+            width: 40.w,
             child: Divider(
               color: activeStep >= i + 1
                   ? AppColor.greenNormalHover