test: Run full e2e suite locally and generate audit report

[VictorGjn]

Context

88 test cases across 9 Playwright specs + 3 unit test files were created in #132. They need to be run against a live instance.

Steps

1. Merge all branches to master
2. npm ci --legacy-peer-deps && npm run build
3. npx playwright test tests/e2e/functional/ --reporter=html
4. Document results in reports/e2e-functional-audit.md
5. Create follow-up issues for each FAIL

Output

A report with per-pipeline status: PASS / FAIL / PARTIAL + exact failure points.