- Create useGlobalShortcuts hook for centralized keyboard shortcut handling at app root
- Add FocusGuardRef module-level ref for tracking text input focus state
- Implement HelpOverlay component displaying available keyboard shortcuts
- Add Ctrl+C (emergency exit), q (quit), ?/h (help toggle), 1-5 (screen switch) shortcuts
- Focus guard prevents shortcuts when text input is focused (except Ctrl+C)
- Update ScreenRouter with controlled/uncontrolled mode support
- Wire global shortcuts into demo app with help overlay integration
- Add comprehensive tests for useGlobalShortcuts and HelpOverlay
- Update README with global shortcuts documentation and usage examples
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