fix: hide billing plan container when name is empty or null

lib/features/profile/presentation/widgets/billing_tab.dart

@@ -144,22 +144,24 @@ class _BillingTabState extends ConsumerState<BillingTab>
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
-          Container(
-            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
-            decoration: BoxDecoration(
-              color: AppColors.accentOrange,
-              borderRadius: BorderRadius.circular(15),
-            ),
-            child: Text(
-              plan?['name'] as String? ?? 'Annual Subscription',
-              style: const TextStyle(
-                fontFamily: 'SourceSerif4',
-                fontSize: 14,
-                color: Colors.white,
+          if ((plan?['name'] as String?)?.trim().isNotEmpty == true) ...[
+            Container(
+              padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
+              decoration: BoxDecoration(
+                color: AppColors.accentOrange,
+                borderRadius: BorderRadius.circular(15),
+              ),
+              child: Text(
+                plan!['name'] as String,
+                style: const TextStyle(
+                  fontFamily: 'SourceSerif4',
+                  fontSize: 14,
+                  color: Colors.white,
+                ),
               ),
             ),
-          ),
-          const SizedBox(height: 20),
+            const SizedBox(height: 20),
+          ],
           Row(
             children: [
               const Icon(Icons.check_circle,