Kalaam: Learn Quranic Arabic

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- Guest users can now continue to discourse without sign-in
- Added a loading indicator for the Leaderboard screen
- Daily Challenge now shows the total points earned in the current day
- Onboarding video performance improved by using local asset files
- Updated certain images and meanings
- Fixed an issue with completed new cards reappearing in lessons
- Fixed an issue with the keyboard obstructing the sign-up popup
- Fixed the background color issue for familiar words in ReadScreen