test(frontend): component testing infra (jsdom + testing-library + vitest projects)

frontend/package.json

@@ -38,6 +38,9 @@
   "devDependencies": {
     "@eslint/js": "^10.0.1",
     "@tailwindcss/vite": "^4.3.3",
+    "@testing-library/jest-dom": "^7.0.1",
+    "@testing-library/react": "^16.3.3",
+    "@testing-library/user-event": "^14.6.7",
     "@types/react": "^19.2.18",
     "@types/react-dom": "^19.2.7",
     "@typescript/native": "npm:typescript@^7.0.2",
@@ -46,6 +49,7 @@
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-jsx-a11y": "^6.10.2",
     "eslint-plugin-react-hooks": "^7.1.1",
+    "jsdom": "^30.0.1",
     "prettier": "^3.9.6",
     "tailwindcss": "^4.3.3",
     "typescript": "npm:@typescript/typescript6@^6.0.2",