Fix inability to expose the Add node's parameter (#877)

* Fix add node

* Simplify document node input defenitions

node-graph/graph-craft/src/node_registry.rs

@@ -43,8 +43,8 @@ static NODE_REGISTRY: &[(NodeIdentifier, NodeConstructor)] = &[
 		stack.push_fn(move |nodes| {
 			let ConstructionArgs::Nodes(construction_nodes) = proto_node.construction_args else { unreachable!("Add Node constructed with out rhs input node") };
 			let value_node = nodes.get(construction_nodes[0] as usize).unwrap();
-			let input_node: DowncastBothNode<_, (), f32> = DowncastBothNode::new(value_node);
-			let node: DynAnyNode<_, f32, _, _> = DynAnyNode::new(ConsNode::new(input_node).then(graphene_core::ops::AddNode));
+			let input_node: DowncastBothNode<_, (), f64> = DowncastBothNode::new(value_node);
+			let node: DynAnyNode<_, f64, _, _> = DynAnyNode::new(ConsNode::new(input_node).then(graphene_core::ops::AddNode));
 
 			if let ProtoNodeInput::Node(node_id) = proto_node.input {
 				let pre_node = nodes.get(node_id as usize).unwrap();