feat(commands): consolidate /hellion and /clearhellion in Plugin.SetupCommands

/hellion routes through one handler with three subcommands: empty arg
toggles the main window, "settings" toggles the settings stub (full
settings UI lands later), "reset" calls ThemeRegistry.SwitchSilent on the
default slug so a broken custom theme can be unloaded without a settings
UI. /clearhellion now lives next to /hellion instead of inside the chat
window. ChatLogWindow loses its old register/unregister pair so the two
slash-commands stop double-binding.

HellionChat/Plugin.cs

@@ -95,6 +95,7 @@ public sealed class Plugin : IAsyncDalamudPlugin
 
     // Phase-2 services are constructed in LoadAsync; null! shape is kept
     // consistent across all properties for clarity.
+    internal Ui.Windows.MainWindow MainWindow { get; private set; } = null!;
     public SettingsWindow SettingsWindow { get; private set; } = null!;
     public ChatLogWindow ChatLogWindow { get; private set; } = null!;
     public DbViewer DbViewer { get; private set; } = null!;
@@ -134,6 +135,7 @@ public sealed class Plugin : IAsyncDalamudPlugin
     // Wrapper cached so TearDown can detach the live instance instead of
     // re-registering with identical args (v1.4.9 ISSUE-1 cleanup).
     private CommandWrapper? _hellionSettingsCmd;
+    private CommandWrapper? _clearHellionCmd;
     private CommandWrapper? _hellionViewCmd;
     private CommandWrapper? _hellionDebuggerCmd;
 #if DEBUG
@@ -293,6 +295,7 @@ public sealed class Plugin : IAsyncDalamudPlugin
         MessageManager = _host.Services.GetRequiredService<MessageManager>();
         AutoTellTabsService = _host.Services.GetRequiredService<AutoTellTabsService>();
 
+        MainWindow = _host.Services.GetRequiredService<Ui.Windows.MainWindow>();
         ChatLogWindow = _host.Services.GetRequiredService<ChatLogWindow>();
         SettingsWindow = _host.Services.GetRequiredService<SettingsWindow>();
         DbViewer = _host.Services.GetRequiredService<DbViewer>();
@@ -744,14 +747,15 @@ public sealed class Plugin : IAsyncDalamudPlugin
     // have working entry points before they're constructed.
     private void SetupCommands()
     {
-        // ChatLogWindow.cs:128 already registers /hellion (ToggleChat). The
-        // description-arg here keeps the Dalamud help list populated.
         _hellionSettingsCmd = Commands.Register(
             "/hellion",
-            "Perform various actions with Hellion Chat."
+            "Toggle Hellion Chat. /hellion settings opens settings, /hellion reset restores the default theme."
         );
         _hellionSettingsCmd.Execute += OnHellionSettingsCommand;
 
+        _clearHellionCmd = Commands.Register("/clearhellion", "Clear the active Hellion Chat tab.");
+        _clearHellionCmd.Execute += OnClearHellionCommand;
+
         _hellionViewCmd = Commands.Register(
             "/hellionView",
             "Get access to your message history, with simple filter options.",
@@ -788,6 +792,12 @@ public sealed class Plugin : IAsyncDalamudPlugin
             _hellionSettingsCmd = null;
         }
 
+        if (_clearHellionCmd is not null)
+        {
+            _clearHellionCmd.Execute -= OnClearHellionCommand;
+            _clearHellionCmd = null;
+        }
+
         if (_hellionViewCmd is not null)
         {
             _hellionViewCmd.Execute -= OnHellionViewCommand;
@@ -810,10 +820,29 @@ public sealed class Plugin : IAsyncDalamudPlugin
 
     private void OnHellionSettingsCommand(string command, string arguments)
     {
-        // /hellion with args is intentionally a no-op (matches pre-v1.4.9
-        // Settings.cs:76-80 behaviour).
-        if (string.IsNullOrWhiteSpace(arguments))
+        var arg = arguments.Trim();
+        if (string.IsNullOrEmpty(arg))
+        {
+            MainWindow.Toggle();
+            return;
+        }
+        if (arg.Equals("settings", StringComparison.OrdinalIgnoreCase))
+        {
             SettingsWindow.Toggle();
+            return;
+        }
+        if (arg.Equals("reset", StringComparison.OrdinalIgnoreCase))
+        {
+            // Recovery path documented in the v2.x master spec — drops a
+            // broken custom theme out of the loader cache without touching
+            // the user's JSON on disk.
+            ThemeRegistry.SwitchSilent(Themes.ThemeRegistry.DefaultSlug);
+        }
+    }
+
+    private void OnClearHellionCommand(string command, string arguments)
+    {
+        MainWindow.ActiveTab?.Clear();
     }
 
     private void OnOpenConfigUi() => SettingsWindow.Toggle();

HellionChat/Ui/ChatLogWindow.cs

@@ -42,8 +42,6 @@ public sealed class ChatLogWindow : Window
 
     internal Plugin Plugin { get; }
 
-    private readonly CommandWrapper _clearHellionCommand;
-    private readonly CommandWrapper _hellionCommand;
     private readonly SymbolPicker _symbolPicker;
 
     internal bool ScreenshotMode;
@@ -142,13 +140,6 @@ public sealed class ChatLogWindow : Window
 
         // Cache wrapper instances so Dispose can detach the same event objects
         // without going through Register() again.
-        _clearHellionCommand = Plugin.Commands.Register(
-            "/clearhellion",
-            "Clear the Hellion Chat log"
-        );
-        _hellionCommand = Plugin.Commands.Register("/hellion");
-        _clearHellionCommand.Execute += ClearLog;
-        _hellionCommand.Execute += ToggleChat;
 
         _symbolPicker = new SymbolPicker();
 
@@ -181,8 +172,6 @@ public sealed class ChatLogWindow : Window
         );
         Plugin.ClientState.Logout -= Logout;
         Plugin.ClientState.Login -= Login;
-        _hellionCommand.Execute -= ToggleChat;
-        _clearHellionCommand.Execute -= ClearLog;
     }
 
     private void Logout(int _, int __)