Fix trayIconActivated MOC mismatch on macOS

Remove Q_OS_MAC guards around trayIconActivated slot declaration
and implementation. MOC generates code referencing the slot
unconditionally, causing a build error on macOS. The slot is
harmless when present - on macOS the tray icon isn't created
so it simply never gets called.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/qt/trianglesgui.cpp

@@ -675,7 +675,6 @@ void TrianglesGUI::createTrayIconMenu()
 #endif
 }
 
-#ifndef Q_OS_MAC
 void TrianglesGUI::trayIconActivated(QSystemTrayIcon::ActivationReason reason)
 {
     if(reason == QSystemTrayIcon::Trigger)
@@ -684,7 +683,6 @@ void TrianglesGUI::trayIconActivated(QSystemTrayIcon::ActivationReason reason)
         toggleHideAction->trigger();
     }
 }
-#endif
 
 void TrianglesGUI::saveWindowGeometry()
 {