- useMorseAudio: wraps MorseAudioEngine, exposes currentSignal for FlashArea
- useProgress: fetches /api/progress + /api/mnemonics, recordAnswer with local stats
- FlashArea: gold flash on signal, height varies dot/dash
- ScoreBar: level name, score, streak display
- PracticeCard: play button, answer input, correct/incorrect feedback with mnemonic
- GamePage: full practice loop, level-up modal at streak%10, anti-repeat history
- Fix: incorrect attempt recorded only once per challenge (no stat inflation on retries)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
