show multiple recipes in the guidebook (#22463)

Content.Client/Guidebook/Controls/GuideReagentReaction.xaml.cs

@@ -0,0 +1,20 @@
+using Content.Client.UserInterface.ControlExtensions;
+using JetBrains.Annotations;
+using Robust.Client.AutoGenerated;
+using Robust.Client.UserInterface.Controls;
+
+namespace Content.Client.Guidebook.Controls;
+
+[UsedImplicitly, GenerateTypedNameReferences]
+public sealed partial class GuideReagentReaction : BoxContainer, ISearchableControl
+{
+    public bool CheckMatchesSearch(string query)
+    {
+        return this.ChildrenContainText(query);
+    }
+
+    public void SetHiddenState(bool state, string query)
+    {
+        Visible = CheckMatchesSearch(query) ? state : !state;
+    }
+}