Set up frontend test infrastructure

Install @testing-library/react, @testing-library/jest-dom,
@testing-library/user-event, and jsdom. Configure Vitest with globals,
jsdom environment, and a setup file importing jest-dom matchers. Add a
custom render helper wrapping components with QueryClientProvider and
MemoryRouter. Exclude e2e/ from vitest. Smoke test covers
formatEvolutionMethod.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/package.json

@@ -29,10 +29,14 @@
     "@axe-core/playwright": "4.11.1",
     "@playwright/test": "1.58.2",
     "@tailwindcss/vite": "4.1.18",
+    "@testing-library/jest-dom": "^6.9.1",
+    "@testing-library/react": "^16.3.2",
+    "@testing-library/user-event": "^14.6.1",
     "@types/node": "24.10.10",
     "@types/react": "19.2.11",
     "@types/react-dom": "19.2.3",
     "@vitejs/plugin-react": "5.1.3",
+    "jsdom": "^28.1.0",
     "oxfmt": "0.33.0",
     "oxlint": "1.48.0",
     "tailwindcss": "4.1.18",