feat: shared components, hooks, and audio engine
Components:
- StyledText: unified text component replacing 5 local copies
- GlassCard: reusable glassmorphic card with blur background
- VideoPlayer: expo-video wrapper with preview/background modes
and gradient fallback when no video URL
Hooks:
- useTimer: extracted timer engine with phase transitions
(PREP → WORK → REST → repeat → COMPLETE), calorie tracking,
and actions (start, pause, resume, skip, stop)
- useHaptics: centralized haptic feedback respecting user settings
- useAudio: expo-av sound effects (countdown beep, phase ding,
completion chime) respecting soundEffects setting
Audio assets: 3 generated WAV files for timer events.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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