Devlog #19

UI polish and bug fixes

• I Improved the mobile flow by replacing the mode button row with a dropdown and simplifying the mobile start screen.
• Extended the round progress animation so it stays visible longer and can continue while the next image is already shown.
• Added small no-sound interaction feedback such as answer animations, panel flashes, and a ready pulse on the next button.
• Fixed stale feedback content so old round text does not linger after moving to the next round.
• Polished the dark mode with better contrast, deeper panel styling, and more consistent button states.