chore(studio): add React Testing Library and coverage tools

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Claude

apps/studio/package.json

@@ -13,6 +13,8 @@
     "build": "pnpm msw:init && vite build",
     "typecheck": "tsc --noEmit",
     "test": "vitest run",
+    "test:watch": "vitest",
+    "test:coverage": "vitest run --coverage",
     "test:bdd": "objectstack test",
     "preview": "vite preview"
   },
@@ -72,9 +74,13 @@
     "@tanstack/router-devtools": "^1.91.6",
     "@tanstack/router-plugin": "^1.91.5",
     "@tailwindcss/postcss": "^4.2.2",
+    "@testing-library/jest-dom": "^6.6.3",
+    "@testing-library/react": "^16.1.0",
+    "@testing-library/user-event": "^14.5.2",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
     "@vitejs/plugin-react": "^6.0.1",
+    "@vitest/coverage-v8": "^4.1.4",
     "autoprefixer": "^10.4.27",
     "esbuild": "^0.28.0",
     "happy-dom": "^20.8.9",