Encryption module control system & session timer improvements

- Added a real verification system for active encryption modules, giving users full control over enabled modules.
- During session purchase or activation, the actual enabled modules are now displayed for both free and paid sessions.
- Refactored session timer initialization for proper functionality and accurate countdown.
- Optimized code structure related to session management and module verification.

src/pwa/pwa-manager.js

@@ -1079,12 +1079,12 @@ const PWAOfflineManager = {
 // Export for module use
 if (typeof module !== 'undefined' && module.exports) {
     module.exports = PWAOfflineManager;
-} else {
+} else if (typeof window !== 'undefined' && !window.PWAOfflineManager) {
     window.PWAOfflineManager = PWAOfflineManager;
 }
 
 // Auto-initialize when DOM is ready
-if (typeof window !== 'undefined') {
+if (typeof window !== 'undefined' && !window.pwaOfflineManager) {
     if (document.readyState === 'loading') {
         document.addEventListener('DOMContentLoaded', () => {
             if (!window.pwaOfflineManager) {