Replace the tsgo native preview with typescript@7.0.2 and port the check scripts to the TS 7 API. Target ES2024, drop useDefineForClassFields: false and unused decorator options, and enable verbatimModuleSyntax. Replace tsx with node plus the source resolver hook, passed to --import as a file URL.
closes#9965
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>