v3: coverage tasks for both suites — deno task test:coverage runs the Deno tests of api/ and shared/ with coverage and writes the report to coverage/api, deno task test:web:coverage runs the Vitest suite with @vitest/coverage-v8 (at vitest's own 5.0.2) into coverage/web. Each prints a table and leaves an HTML report and an lcov.info. They write to separate folders because deno test --clean empties its whole output directory, which would take the frontend report with it. The frontend report counts src/ without src/test/ and the generated src/locales/; the backend report still lists api/test/helpers.ts and setup.ts, since deno.json has no coverage exclude and a separate deno coverage --exclude pass merged the raw profiles into different figures. No behaviour changes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

package.json

@@ -42,6 +42,7 @@
     "@testing-library/user-event": "^14.6.7",
     "@types/node": "^26.6.3",
     "@types/react-dom": "^19.3.0",
+    "@vitest/coverage-v8": "^5.0.2",
     "eslint": "^10.11.0",
     "eslint-plugin-react-hooks": "^7.1.1",
     "eslint-plugin-react-refresh": "^0.5.7",