fix: allow setting NodeRef by implementing IsDisposed (#4367)

tachys/src/reactive_graph/node_ref.rs

@@ -7,8 +7,8 @@ use reactive_graph::{
         RwSignal,
     },
     traits::{
-        DefinedAt, Get, Notify, ReadUntracked, Set, Track, UntrackableGuard,
-        Write,
+        DefinedAt, Get, IsDisposed, Notify, ReadUntracked, Set, Track,
+        UntrackableGuard, Write,
     },
 };
 use send_wrapper::SendWrapper;
@@ -158,6 +158,16 @@ where
     }
 }
 
+impl<E> IsDisposed for NodeRef<E>
+where
+    E: ElementType,
+    E::Output: 'static,
+{
+    fn is_disposed(&self) -> bool {
+        self.0.is_disposed()
+    }
+}
+
 /// Create a [NodeRef].
 #[inline(always)]
 #[track_caller]