Wren Draw Gate Seek

Flashcard system with spaced repetition and review scheduling.
- Deck organization with categories, icons, and sunset colors.
- Study interface with card-flip animations and progress tracking.
- Review interval calculation based on learning history.
- Visual mastery metrics with real-time progress indicators.
- Local storage for flashcards, schedules, and deck parameters.
- Shuffled review sessions for retention.
- Golden Hour-themed design with warm gradients.
- Deck management including card creation and deletion.