- Add 'Validate pencil marks' feature to highlight invalid marks [Bart Uliasz]
- Fix landscape pop-up keypad visibility and button sizing [Bart Uliasz]
- Refactor SudokuBoardView measurement and update landscape layout [Bart Uliasz]
- Optimize BaseThemeColor and 'Modify Cell Coloring Colors' dialogs for landscape mode [Bart Uliasz]
- Improve theme selection UI and primary color preview in custom themes [Bart Uliasz]
- Performance optimizations: caching game stats, batch updates for commands, and guarding UI redraws [Bart Uliasz]
- Fix ANR during batch undo operations [Bart Uliasz]
- Fix UI clipping and centering issues across multiple screens [Bart Uliasz]
- Improve edge-to-edge compliance and fix UI overlaps [Bart Uliasz]
- Translations updates [Bart Uliasz, Michalis, hamburger2048]
