improved app rating UI logic by showing a disabled state during availability check instead of hiding the component

lib/view/pages/overhang.dart

@@ -49,23 +49,13 @@ class _OverhangState extends State<Overhang> {
       FutureBuilder(
         future: InAppReview.instance.isAvailable(),
         builder: (context, snapshot) {
-          if (!snapshot.hasData) return const SizedBox.shrink();
-
           String? getPlatformStoreName() {
             if (Platform.isAndroid) return 'Play store';
             if (Platform.isIOS) return 'App store';
             return null;
           }
 
-          return ListTile(
+          Future<void> rate() => InAppReview.instance
-            leading: const CenteredLeading(Icon(Icons.star_rate_outlined)),
-            title: const Text('App bewerten'),
-            subtitle: getPlatformStoreName().wrapNullable(
-              (data) => Text('Im $data'),
-            ),
-            trailing: const Icon(Icons.arrow_right),
-            onTap: () {
-              InAppReview.instance
               .openStoreListing(appStoreId: '6458789560')
               .then(
                 (value) {
@@ -82,7 +72,17 @@ class _OverhangState extends State<Overhang> {
               );
             },
           );
-            },
+
+          final ready = snapshot.connectionState == ConnectionState.done;
+          return ListTile(
+            enabled: ready,
+            leading: const CenteredLeading(Icon(Icons.star_rate_outlined)),
+            title: const Text('App bewerten'),
+            subtitle: getPlatformStoreName().wrapNullable(
+              (data) => Text('Im $data'),
+            ),
+            trailing: const Icon(Icons.arrow_right),
+            onTap: !ready ? null : rate
           );
         },
       ),