feat: add success and error feedback for experience submission in ExperiencePage

apps/mobile/packages/features/staff/profile_sections/onboarding/experience/lib/src/presentation/pages/experience_page.dart

@@ -58,7 +58,14 @@ class ExperiencePage extends StatelessWidget {
         child: BlocConsumer<ExperienceBloc, ExperienceState>(
           listener: (context, state) {
           if (state.status == ExperienceStatus.success) {
+            ScaffoldMessenger.of(context).showSnackBar(
+              const SnackBar(content: Text('Experience saved successfully')),
+            );
             Modular.to.pop();
+          } else if (state.status == ExperienceStatus.failure) {
+            ScaffoldMessenger.of(context).showSnackBar(
+              SnackBar(content: Text(state.errorMessage ?? 'An error occurred')),
+            );
           }
         },
           builder: (context, state) {
@@ -166,8 +173,6 @@ class ExperiencePage extends StatelessWidget {
         border: Border(top: BorderSide(color: UiColors.border)),
       ),
       child: SafeArea(
-        child: SizedBox(
-          width: double.infinity,
         child: UiButton.primary(
           onPressed: state.status == ExperienceStatus.loading
               ? null
@@ -186,7 +191,6 @@ class ExperiencePage extends StatelessWidget {
               : null,
         ),
       ),
-      ),
     );
   }
 }