Mobile App Push Notification Authentication & Registration

The primary purpose of this patch was to To enhance the security and reliability of mobile push notifications by ensuring proper authentication and registration of devices before notifications are sent, preventing unauthorized or misrouted delivery.

• Added device registration flow for push notifications in the mobile app
• Implemented authentication validation before enabling notification delivery
• Improved security by ensuring only registered devices receive notifications
• Enhanced accuracy of user-device mapping for notifications
• Fixed issues related to unregistered or duplicate device token handling
• Improved reliability of notification delivery across sessions and devices
• Minor bug fixes and performance improvements