fix dispose issue on read

app/lib/extensions/ref_cache.dart

@@ -23,7 +23,7 @@ import 'package:riverpod/riverpod.dart';
 
 extension CacheForExtension on Ref {
   /// Keeps the provider alive for [duration].
-  void cacheFor(Duration duration) {
+  KeepAliveLink cacheFor(Duration duration) {
     // Immediately prevent the state from getting destroyed.
     final link = keepAlive();
     // After duration has elapsed, we re-enable automatic disposal.
@@ -32,5 +32,7 @@ extension CacheForExtension on Ref {
     // Optional: when the provider is recomputed (such as with ref.watch),
     // we cancel the pending timer.
     onDispose(timer.cancel);
+
+    return link;
   }
 }