- Home: add keyboard number shortcuts (1/2/3) for module navigation
- Boxing: add P2 key mode switching with pill-style AppBar header
- Registration: replace Switch with pill-style lock header matching boxing design
- Add Android keyCode fallback for scanner device compatibility
- Simplify home page cards to show only module name + shortcut hint
- Add lock redesign HTML preview document
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
