Guidebook links (#17162)

* Guidebook links

* warning!

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

@@ -1,7 +1,11 @@
+using System.Diagnostics.CodeAnalysis;
 using System.Linq;
+using Content.Client.Guidebook.RichText;
 using Content.Client.UserInterface.Controls;
 using Content.Client.UserInterface.Controls.FancyTree;
+using JetBrains.Annotations;
 using Robust.Client.AutoGenerated;
+using Robust.Client.UserInterface;
 using Robust.Client.UserInterface.Controls;
 using Robust.Client.UserInterface.XAML;
 using Robust.Shared.ContentPack;
@@ -9,7 +13,7 @@ using Robust.Shared.ContentPack;
 namespace Content.Client.Guidebook.Controls;
 
 [GenerateTypedNameReferences]
-public sealed partial class GuidebookWindow : FancyWindow
+public sealed partial class GuidebookWindow : FancyWindow, ILinkClickHandler
 {
     [Dependency] private readonly IResourceManager _resourceManager = default!;
     [Dependency] private readonly DocumentParsingManager _parsingMan = default!;
@@ -139,4 +143,20 @@ public sealed partial class GuidebookWindow : FancyWindow
 
         return item;
     }
+
+    public void HandleClick(string link)
+    {
+        if (!_entries.TryGetValue(link, out var entry))
+            return;
+
+        if (Tree.TryGetIndexFromMetadata(entry, out var index))
+        {
+            Tree.ExpandParentEntries(index.Value);
+            Tree.SetSelectedIndex(index);
+        }
+        else
+        {
+            ShowGuide(entry);
+        }
+    }
 }