907fa937e6
Adjust base colors (teal, blue, green, red, yellow, dimGray) to meet 4.5:1 contrast ratio against white backgrounds. Update thinking level colors to reference theme vars for consistency. Refactor test-theme-colors.ts into a CLI with contrast, test, and theme commands for easier color validation. Co-authored-by: Mario Zechner <badlogicgames@gmail.com>