Extend and patch @testing-library/jest-dom matchers

• Patches the toHaveStyle color mismatch issue (#350)
• Provides a drop-in update that avoids changes to test files, making it easy to remove once the issue in @testing-library/jest-dom is fixed in the future.

npm install -D jest-dom-extended

Load the setup file after @testing-library/jest-dom in your test configuration.

{
  "setupFilesAfterEnv": [
    "@testing-library/jest-dom",
    "jest-dom-extended/jest"
  ]
}

export default defineConfig({
  test: {
    setupFiles: [
      "@testing-library/jest-dom",
      "jest-dom-extended/vitest",
    ],
  },
});