Penzu

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- Improved sign-in and account creation with added security checks
- More reliable background syncing and notification handling
- Upgrades/subscriptions now use the latest Google Play Billing, with better recovery if an upgrade was interrupted
- Improved reliability for deep linking into app
- Fixed crashes and improved compatibility on newer Android versions (including Android 15)
- Improved tablet support (split-view, rotation, search/tagging) and fixed multiple tablet-related crashes