Redesigned the app concept.

This version has changed the App name from "Suppai - Learn Japanese" to just "Ponz - Learn Japanese" because I like the sound of "Ponz" more.

This version has added following features and fixes: - Changed the default life limit for free users from 12 to 24, and for premium users from 24 to unlimited. This allows free users to study more without interruptions, while premium users can enjoy unlimited study sessions. - Changed the life recovery interval for free users from 2 hours to 30 minutes, enabling users to regain lives faster and continue their learning without long waits. - Changed the internal push notification service. This change improves the reliability and functionality of push notifications, ensuring users receive timely reminders and updates. - Added a progress bar to the home screen, allowing users to easily track how many questions they still need to answer to reach the goal of the current level. - Display the current level on the home screen, providing users with a clear indication of their progress.

This version has added following features and fixes: - Explained the learning algorithm in detail, including how the SRS (spaced repetition system) works and how it adapts to the user's performance. - Promoted newly registered users to choose the difficulty level based on their Japanese proficiency, ensuring a more tailored learning experience. - Introduced a daily welcome message that displays a Japanese proverb and the number of days the user has logged in. - Added a sharing feature for study stats, allowing users to share their learning achievements on social media. - Prompted users to set a daily study reminder after they complete their study session, encouraging consistent study habits.

This version includes minor bug fixes and improvements listed below: - Fixed an issue where the app might not function properly if the user had no internet connection when resuming from background. - Fixed an inconsistency in timezone handling between the mobile app and server, ensuring all date comparisons are done in UTC to prevent off-by-one-day errors. - Fixed an issue where the accuracy percentage for grammar questions could display incorrectly after answering a question. - Added correct answer indication in the bottom sheet after answering a question. - Made some premium features (History and Review) partially available to free users.