No test framework configured — install Vitest and React Testing Library

[k-deejah]

Problem

The project has zero test files, no test runner installed, and no test script in package.json. The .github/workflows/test.yml CI workflow file exists but there is nothing for it to run — it either always passes vacuously or always fails, giving a false signal on PRs.

Two related gaps: (1) there is no Vitest or Jest configuration, so contributors cannot write tests even if they want to; (2) there is no testing setup file or test utilities folder, meaning the first contributor to add a test would need to set up the entire infrastructure from scratch.

Solution

Install Vitest + React Testing Library and configure the project for testing:

• Install: vitest, @vitest/ui, jsdom, @testing-library/react, @testing-library/user-event, @testing-library/jest-dom
• Add vitest config to vite.config.ts with jsdom environment
• Create src/test/setup.ts that extends jest-dom matchers
• Add "test": "vitest --run" and "test:ui": "vitest --ui" to package.json scripts
• Update .github/workflows/test.yml to run npm test

Acceptance Criteria

• npm test runs and exits with a meaningful pass/fail result
• Vitest and React Testing Library are in devDependencies
• src/test/setup.ts exists and is referenced in vitest config
• The test.yml workflow runs npm test on every PR
• At least one placeholder test file exists to validate the setup works

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Note for Contributors: If you are assigned to this issue, write a clear and detailed description for your pull request. Explain what was changed, why it was needed, how it was implemented, and include any relevant testing or screenshots where applicable.