Notification Timer - Countdown

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• Privacy & Storage: Removed all legacy storage permissions and transitioned to the Storage Access Framework (SAF) for secure, permission-free backup and restore.
• Modern Compatibility: Added full support for Android 15 (API 37) and implemented Edge-to-Edge display for a more immersive UI.
• Stability: Updated core dependencies and refined internal timer logic for better performance and improved handling of custom alert sounds.