- Lesson screen HTML with letter-area and keyboard containers
- initLessonScreen: renders keyboard, shows letters, handles keypress
- Correct key dissolves letter with animation, advances to next
- Wrong key does nothing (per D-03), correct key stays highlighted
- startLesson in app.ts: manages lesson lifecycle and cleanup
- onComplete: updates progress, unlocks next level, saves to IndexedDB
- CSS: floating letter animation, dissolve effect on correct press
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
gurixandClaude Opus 4.6
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