[jeffrey-graham]

Summary

• Adds @vitest/coverage-v8 (4.1.10) and "test:coverage": "vitest run --coverage" to both frontend/package.json and indexer/package.json.
• Configures V8 coverage (reporter: ["text", "html", "lcov"], reportsDirectory: "./coverage") in frontend/vitest.config.mts and indexer/vitest.config.ts, and ignores coverage/ in .gitignore.
• Updates .github/workflows/ci.yml to run npm run test:coverage in both the frontend and indexer jobs (printing coverage percentages in the job logs) and upload frontend-coverage and indexer-coverage artifacts via actions/upload-artifact@v4.

Verification

• Ran npm ci && npm run test:coverage in indexer/ and verified V8 text summary + coverage/ output.
• Ran npm ci && npx vitest run src/lib/format.test.ts --coverage in frontend/ and verified V8 text summary + coverage/ output.

Closes #314

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