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/src/test/setup.ts

@@ -0,0 +1 @@
+import '@testing-library/jest-dom'

frontend/src/test/utils.tsx

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+import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
+import { render, type RenderOptions } from '@testing-library/react'
+import { type ReactElement } from 'react'
+import { MemoryRouter } from 'react-router-dom'
+
+export function createTestQueryClient(): QueryClient {
+  return new QueryClient({
+    defaultOptions: {
+      queries: { retry: false, gcTime: Infinity },
+      mutations: { retry: false },
+    },
+  })
+}
+
+function AllProviders({ children }: { children: React.ReactNode }) {
+  const queryClient = createTestQueryClient()
+  return (
+    <QueryClientProvider client={queryClient}>
+      <MemoryRouter>{children}</MemoryRouter>
+    </QueryClientProvider>
+  )
+}
+
+function customRender(ui: ReactElement, options?: Omit<RenderOptions, 'wrapper'>) {
+  return render(ui, { wrapper: AllProviders, ...options })
+}
+
+export * from '@testing-library/react'
+export { customRender as render }