Expand unit, E2E, and utility tests for full coverage. Co-authored-by: Moheeb Zara <1184415+virgilvox@users.noreply.github.com>
Set up Vitest for unit/integration tests and Playwright for E2E tests; add configs, tests, and documentation Co-authored-by: Moheeb Zara <1184415+virgilvox@users.noreply.github.com>