Chem guidebook (#17123)

* im good at atomizing. welcome to half-finished chem guides.

* wagh

* e

* save work

* aa

* woweee UI

* finishing the last of it

* don't actually update the engine :(

---------

Co-authored-by: moonheart08 <moonheart08@users.noreply.github.com>

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

@@ -0,0 +1,60 @@
+using System.Diagnostics.CodeAnalysis;
+using System.Linq;
+using Content.Client.Guidebook.Richtext;
+using Content.Shared.Chemistry.Reagent;
+using JetBrains.Annotations;
+using Robust.Client.AutoGenerated;
+using Robust.Client.UserInterface;
+using Robust.Client.UserInterface.Controls;
+using Robust.Client.UserInterface.XAML;
+using Robust.Shared.Prototypes;
+
+namespace Content.Client.Guidebook.Controls;
+
+/// <summary>
+///     Control for embedding a reagent into a guidebook.
+/// </summary>
+[UsedImplicitly, GenerateTypedNameReferences]
+public sealed partial class GuideReagentGroupEmbed : BoxContainer, IDocumentTag
+{
+    [Dependency] private readonly IPrototypeManager _prototype = default!;
+
+    public GuideReagentGroupEmbed()
+    {
+        RobustXamlLoader.Load(this);
+        IoCManager.InjectDependencies(this);
+        MouseFilter = MouseFilterMode.Stop;
+    }
+
+    public GuideReagentGroupEmbed(string group) : this()
+    {
+        var prototypes = _prototype.EnumeratePrototypes<ReagentPrototype>()
+            .Where(p => p.Group.Equals(group)).OrderBy(p => p.LocalizedName);
+        foreach (var reagent in prototypes)
+        {
+            var embed = new GuideReagentEmbed(reagent);
+            GroupContainer.AddChild(embed);
+        }
+    }
+
+    public bool TryParseTag(Dictionary<string, string> args, [NotNullWhen(true)] out Control? control)
+    {
+        control = null;
+        if (!args.TryGetValue("Group", out var group))
+        {
+            Logger.Error("Reagent group embed tag is missing group argument");
+            return false;
+        }
+
+        var prototypes = _prototype.EnumeratePrototypes<ReagentPrototype>()
+            .Where(p => p.Group.Equals(group)).OrderBy(p => p.LocalizedName);
+        foreach (var reagent in prototypes)
+        {
+            var embed = new GuideReagentEmbed(reagent);
+            GroupContainer.AddChild(embed);
+        }
+
+        control = this;
+        return true;
+    }
+}