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

lib/view/pages/overhang.dart

@@ -49,40 +49,40 @@ 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;
           }
 
+          Future<void> rate() => InAppReview.instance
+              .openStoreListing(appStoreId: '6458789560')
+              .then(
+                (value) {
+              if (!context.mounted) return;
+              InfoDialog.show(context, 'Vielen Dank!');
+            },
+            onError: (error) {
+              if (!context.mounted) return;
+              InfoDialog.show(
+                context,
+                error.toString(),
+                copyable: true,
+                title: 'Fehler',
+              );
+            },
+          );
+
+          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: () {
-              InAppReview.instance
-                  .openStoreListing(appStoreId: '6458789560')
-                  .then(
-                    (value) {
-                      if (!context.mounted) return;
-                      InfoDialog.show(context, 'Vielen Dank!');
-                    },
-                    onError: (error) {
-                      if (!context.mounted) return;
-                      InfoDialog.show(
-                        context,
-                        error.toString(),
-                        copyable: true,
-                        title: 'Fehler',
-                      );
-                    },
-                  );
-            },
+            onTap: !ready ? null : rate
           );
         },
       ),