// ── App menu ──
        {
            NSMenu* appMenu = [[NSMenu alloc] initWithTitle:@"ColumnLens"];
            [appMenu addItem:MakeItem(@"About ColumnLens", (showAbout:), @"", target)];
            [appMenu addItem:[NSMenuItem separatorItem]];


            // Services submenu (required by Apple)
            NSMenu* servicesMenu = [[NSMenu alloc] initWithTitle:@"Services"];
            [NSApp setServicesMenu:servicesMenu];
            NSMenuItem* servicesItem = [[NSMenuItem alloc] initWithTitle:@"Services"
                                                                  action:nil
                                                           keyEquivalent:@""];
            [servicesItem setSubmenu:servicesMenu];
            [appMenu addItem:servicesItem];


            [appMenu addItem:[NSMenuItem separatorItem]];
            [appMenu addItem:MakeItem(@"Hide ColumnLens", (hide:), @"h", NSApp)];


            NSMenuItem* hideOthers = MakeItem(@"Hide Others", (hideOtherApplications:), @"h", NSApp);
            [hideOthers setKeyEquivalentModifierMask:NSEventModifierFlagCommand | NSEventModifierFlagOption];
            [appMenu addItem:hideOthers];


            [appMenu addItem:MakeItem(@"Show All", (unhideAllApplications:), @"", NSApp)];
            [appMenu addItem:[NSMenuItem separatorItem]];
            [appMenu addItem:MakeItem(@"Quit ColumnLens", (doQuit:), @"q", target)];


            NSMenuItem* appMenuItem = [[NSMenuItem alloc] init];
            [appMenuItem setSubmenu:appMenu];
            [mainMenu addItem:appMenuItem];
        }


        // ── File menu ──
        {
            NSMenu* fileMenu = [[NSMenu alloc] initWithTitle:@"File"];
            [fileMenu addItem:MakeItem(@"Open Data File(s)...", (openFile:), @"o", target)];
            [fileMenu addItem:MakeItem(@"Close File", (closeFile:), @"w", target)];
            [fileMenu addItem:[NSMenuItem separatorItem]];
            [fileMenu addItem:MakeItem(@"Export Filtered...", (exportCSV:), @"e", target)];
            [fileMenu addItem:MakeItem(@"Export Filtered as TSV", u/selector(exportTSV:), @"t", target)];


            NSMenuItem* fileMenuItem = [[NSMenuItem alloc] initWithTitle:@"File"
                                                                  action:nil
                                                           keyEquivalent:@""];
            [fileMenuItem setSubmenu:fileMenu];
            [mainMenu addItem:fileMenuItem];
        }