diff -r 81c4f73236a4 -r c3f2f16fa4b8 ui/cocoa/MainWindow.h
--- a/ui/cocoa/MainWindow.h	Sat Oct 04 14:54:25 2025 +0200
+++ b/ui/cocoa/MainWindow.h	Sun Oct 19 21:20:08 2025 +0200
@@ -29,11 +29,14 @@
 #import "toolkit.h"
 #import "../ui/window.h"
 
-@interface MainWindow : NSWindow
+@interface MainWindow : NSWindow<UiToplevelObject>
 
 @property (strong) NSView *sidebar;
+@property (strong) NSView *leftPanel;
+@property (strong) NSView *rightPanel;
+@property int topOffset;
 
-- (MainWindow*)init:(UiObject*)obj withSidebar:(BOOL)sidebar;
+- (MainWindow*)init:(UiObject*)obj withSidebar:(BOOL)hasSidebar withSplitview:(BOOL)hasSplitview;
 
 @end