test: add stage a prototype contracts

frontend/package.json

@@ -7,7 +7,9 @@
     "dev": "vite",
     "build": "tsc -b && vite build",
     "typecheck": "tsc -b",
-    "lint": "eslint src --ext ts,tsx"
+    "lint": "eslint src --ext ts,tsx",
+    "test": "vitest",
+    "test:run": "vitest run"
   },
   "dependencies": {
     "@fontsource-variable/geist": "^5.2.9",
@@ -27,14 +29,19 @@
     "vite": "^6.0.0"
   },
   "devDependencies": {
+    "@testing-library/jest-dom": "^6.9.1",
+    "@testing-library/react": "^16.3.2",
+    "@testing-library/user-event": "^14.6.1",
     "@types/node": "^26.0.1",
     "@types/react": "^19.0.0",
     "@types/react-dom": "^19.0.0",
     "@vitejs/plugin-react": "^4.3.0",
     "autoprefixer": "^10.4.20",
     "eslint": "^9.16.0",
+    "jsdom": "^26.1.0",
     "postcss": "^8.4.49",
     "tailwindcss": "^3.4.16",
-    "typescript": "^5.7.0"
+    "typescript": "^5.7.0",
+    "vitest": "^3.2.7"
   }
 }