Function cleanup

modules/action/context/dropdown.js:729–733

()

    // Cleanup on page unload
    const cleanup = () => {
        clearInterval(cleanupInterval);
        detector.clear();
        console.log('🧹 Dropdown detection cleaned up');
    };

    // beforeunload doesn't always fire (bfcache, mobile browsers)
    window.addEventListener('beforeunload', cleanup);