Improved stability and user experience

- Removed unnecessary requests to improve performance, reduce bandwidth usage, and prevent crashes.
- Fixed crashes during the SIN test caused by incorrect handling of digit audio playback.
- Improved handling of service availability issues by adding automatic retries before failing gracefully.
- Fixed crashes in the SIN test results screen caused by requests being made after the logic module had closed.
- Fixed related crashes on other screens caused by the same logic module issue.
- Fixed the header help (?) button so it now links correctly to the website.
- Updated website links and refreshed the Discover section.