build: rename repository folder ChatTwo to HellionChat

Repository folder, csproj, solution and all CI/build paths now use
the consolidated HellionChat name.

- ChatTwo/ → HellionChat/ (git mv preserves history with --follow)
- ChatTwo.csproj → HellionChat.csproj
- ChatTwo.sln → HellionChat.sln; obsolete Tests project entry removed
  (private/untracked sandbox)
- AssemblyInfo.cs InternalsVisibleTo for ChatTwo.Tests removed
  (file emptied; can be repopulated when actual tests land)
- repo.json and yaml image URLs updated (ChatTwo/images/ → HellionChat/images/)
- .github/workflows/{build,codeql,release}.yml csproj paths
- .github/dependabot.yml directory path

Functional behavior unchanged.

HellionChat/Util/WrapperUtil.cs

@@ -0,0 +1,26 @@
+using HellionChat.Resources;
+using Dalamud.Interface.ImGuiNotification;
+
+namespace HellionChat.Util;
+
+public static class WrapperUtil
+{
+    public static void AddNotification(string content, NotificationType type, bool minimized = true)
+    {
+        Plugin.Notification.AddNotification(new Notification { Content = content, Type = type, Minimized = minimized });
+    }
+
+    public static void TryOpenUri(Uri uri)
+    {
+        try
+        {
+            Plugin.Log.Debug($"Opening URI {uri} in default browser");
+            Dalamud.Utility.Util.OpenLink(uri.ToString());
+        }
+        catch (Exception ex)
+        {
+            Plugin.Log.Error($"Error opening URI: {ex}");
+            AddNotification(Language.Context_OpenInBrowserError, NotificationType.Error);
+        }
+    }
+}