Add physics-based flashcard component with drag, throw, and momentum: - Random generation of 8-15 flashcards with abacus visualizations - Smooth drag interactions with velocity-based rotation - Decay physics for realistic throwing and sliding - Transform-origin pivot point based on click position - Position persistence so cards stay where thrown 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>