chore: added basic jest testing support

also added an example test for the counter in the components.tsx file to demonstrate functionality of testing configuration. installed all dependencies for testing using --save-dev to make sure they are stored as dev dependencies

ref: N25B-212

package.json

@@ -16,6 +16,10 @@
   },
   "devDependencies": {
     "@eslint/js": "^9.36.0",
+    "@testing-library/jest-dom": "^6.9.1",
+    "@testing-library/react": "^16.3.0",
+    "@testing-library/user-event": "^14.6.1",
+    "@types/jest": "^30.0.0",
     "@types/react": "^19.1.13",
     "@types/react-dom": "^19.1.9",
     "@vitejs/plugin-react": "^5.0.3",
@@ -23,6 +27,10 @@
     "eslint-plugin-react-hooks": "^5.2.0",
     "eslint-plugin-react-refresh": "^0.4.20",
     "globals": "^16.4.0",
+    "identity-obj-proxy": "^3.0.0",
+    "jest": "^30.2.0",
+    "jest-environment-jsdom": "^30.2.0",
+    "ts-jest": "^29.4.5",
     "typescript": "~5.8.3",
     "typescript-eslint": "^8.44.0",
     "vite": "^7.1.7"