- Add ScoringColorScheme class with explicit text colors per scheme
- Implement traditional (vibrant) and lowSaturation (muted) color schemes
- Add disabled state colors for greying out inactive elements
- Refactor scoring_cell.dart and scoring_keypad.dart to use centralized colors
- Grey out Sum of 6 column when in 3-arrow end mode while maintaining layout
- Add comprehensive color scheme documentation and usage examples
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Co-Authored-By: Claude <noreply@anthropic.com>