Implements a comprehensive Python-level focus management system showing:
- FocusManager: central coordinator for keyboard routing, tab cycling, modal stack
- ModifierTracker: workaround for tracking Shift/Ctrl/Alt state (#160)
- FocusableGrid: WASD movement in a grid with player marker
- TextInputWidget: text entry with cursor, backspace, home/end
- MenuIcon: icons that open modal dialogs on Space/Enter
Features demonstrated:
- Click-to-focus on any widget
- Tab/Shift+Tab cycling through focusable widgets
- Visual focus indicators (blue outline)
- Keyboard routing to focused widget
- Modal dialog push/pop stack
- Escape to close modals
Addresses #143🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
