tests: make individual test cases' lines terminal output to be colored gray (#6)

Author: shtaif

package.json

@@ -62,6 +62,7 @@
     "@types/react-dom": "^18.0.11",
     "@vitejs/plugin-react-swc": "^3.6.0",
     "@vitest/ui": "^2.1.8",
+    "colorette": "^2.0.20",
     "eslint": "^9.16.0",
     "eslint-config-prettier": "^9.1.0",
     "globals": "^15.13.0",