- Replace custom spinners with Skeleton
- Replace native inputs/select with design-system components
- Simplify dictation mode (user self-judges instead of input)
- Set body background to primary-50
- Clean up answer button shortcuts
- Add reverse mode to swap card front/back
- Add dictation mode with TTS audio playback and answer verification
- Add i18n translations for new features in all 8 languages
- Integrate useAudioPlayer hook for TTS playback
- Delete (features)/memorize directory
- Create /decks/[deck_id]/learn with Memorize component and page
- Update InDeck.tsx to navigate to new learn route
- Fix homepage memorize link to point to /decks
