feat(layout): add top-tabs layout mode and shared channel resolver

HellionChat/Ui/Windows/MainWindow.cs

@@ -25,6 +25,7 @@ internal sealed class MainWindow : Window
 
     private readonly Components.HonorificHeader _honorific;
     private readonly Components.Sidebar _sidebar;
+    private readonly Components.TopTabBar _topTabs;
     private readonly Components.MessageList _messages;
     private readonly Components.InputBar _input;
     private readonly Components.StatusBar _status;
@@ -39,6 +40,7 @@ internal sealed class MainWindow : Window
     public MainWindow(
         Components.HonorificHeader honorific,
         Components.Sidebar sidebar,
+        Components.TopTabBar topTabs,
         Components.MessageList messages,
         Components.InputBar input,
         Components.StatusBar status,
@@ -48,6 +50,7 @@ internal sealed class MainWindow : Window
     {
         _honorific = honorific;
         _sidebar = sidebar;
+        _topTabs = topTabs;
         _messages = messages;
         _input = input;
         _status = status;
@@ -121,6 +124,17 @@ internal sealed class MainWindow : Window
         var bodyWidth = ImGui.GetContentRegionAvail().X;
         _honorific.Draw(bodyWidth);
 
+        if (Plugin.Config.MainWindowLayoutMode == MainWindowLayoutMode.TopTabs)
+        {
+            _topTabs.Draw(Plugin.Config.Tabs, ref _activeTab);
+            using (ImRaii.Group())
+            {
+                DrawMainArea();
+            }
+            return;
+        }
+
+        // Sidebar layout (default).
         using (ImRaii.Group())
         {
             _sidebar.Draw(bodyWidth, Plugin.Config.Tabs, ref _activeTab);