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/Code/ChatSource.cs

@@ -0,0 +1,42 @@
+using Dalamud.Game.Text;
+
+namespace HellionChat.Code;
+
+[Flags]
+public enum ChatSource : ushort
+{
+    None = 0,
+
+    /// <summary>The player currently controlled by the local client.</summary>
+    LocalPlayer = 1 << XivChatRelationKind.LocalPlayer,
+
+    /// <summary>A player in the same 4-man or 8-man party as the local player.</summary>
+    PartyMember = 1 << XivChatRelationKind.PartyMember,
+
+    /// <summary>A player in the same alliance raid.</summary>
+    AllianceMember = 1 << XivChatRelationKind.AllianceMember,
+
+    /// <summary>A player not in the local player's party or alliance.</summary>
+    OtherPlayer = 1 << XivChatRelationKind.OtherPlayer,
+
+    /// <summary>An enemy entity that is currently in combat with the player or party.</summary>
+    EngagedEnemy = 1 << XivChatRelationKind.EngagedEnemy,
+
+    /// <summary>An enemy entity that is not yet in combat or claimed.</summary>
+    UnengagedEnemy = 1 << XivChatRelationKind.UnengagedEnemy,
+
+    /// <summary>An NPC that is friendly or neutral to the player (e.g., EventNPCs).</summary>
+    FriendlyNpc = 1 << XivChatRelationKind.FriendlyNpc,
+
+    /// <summary>A pet (Summoner/Scholar) or companion (Chocobo) belonging to the local player.</summary>
+    PetOrCompanion = 1 << XivChatRelationKind.PetOrCompanion,
+
+    /// <summary>A pet or companion belonging to a member of the local player's party.</summary>
+    PetOrCompanionParty = 1 << XivChatRelationKind.PetOrCompanionParty,
+
+    /// <summary>A pet or companion belonging to a member of the alliance.</summary>
+    PetOrCompanionAlliance = 1 << XivChatRelationKind.PetOrCompanionAlliance,
+
+    /// <summary>A pet or companion belonging to a player not in the party or alliance.</summary>
+    PetOrCompanionOther = 1 << XivChatRelationKind.PetOrCompanionOther,
+}