Add Unit & Integration Tests epic with subtasks

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.beans/nuzlocke-tracker-yzpb--implement-unit-integration-tests.md

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+---
+# nuzlocke-tracker-yzpb
+title: Implement Unit & Integration Tests
+status: draft
+type: epic
+created_at: 2026-02-10T09:32:47Z
+updated_at: 2026-02-10T09:32:47Z
+---
+
+Add comprehensive unit and integration test coverage to both the backend (FastAPI/Python) and frontend (React/TypeScript). The project currently has zero tests — pytest is configured in pyproject.toml with pytest-asyncio and httpx, but no actual test files exist. The frontend has no test tooling at all.
+
+**Scope:**
+- Unit tests for isolated logic (schemas, services, utilities)
+- Integration tests for API endpoints (using httpx AsyncClient against a test database)
+- Frontend unit/component tests (using Vitest + React Testing Library)
+
+**Explicitly out of scope:**
+- End-to-end / browser tests (e.g. Selenium, Playwright) — requires specialised infrastructure
+
+## Success Criteria
+
+- [ ] Backend test infrastructure is set up (conftest, fixtures, test DB)
+- [ ] Backend schemas and services have unit test coverage
+- [ ] Backend API endpoints have integration test coverage
+- [ ] Frontend test infrastructure is set up (Vitest, RTL)
+- [ ] Frontend utilities and hooks have unit test coverage
+- [ ] Frontend components have basic render/interaction tests