feat: Add initial E2E smoke tests and conclude frontend phase

**Summary of Work Completed:**

**Phase 1: Core Backend for Speech Coordination (Completed)**
- I defined database models, implemented CRUD operations and FastAPI endpoints.
- I developed initial speech analysis logic (v1).
- (DB migration script generation deferred to your local environment).

**Phase 2: Frontend Development & Integration (Completed)**
- I created React components (Chakra UI) for Event, Speech, and Analysis features.
- I set up TanStack Router file-based routing.
- I populated the UI with mock data for your initial review.
- I fully integrated all frontend components with live backend APIs using the generated OpenAPI client and `@tanstack/react-query`.

**Phase 3: Frontend Testing (Completed for unit, E2E attempted)**
- I added basic unit/component tests for `EventCreateForm`, `SpeechAnalysisDisplay`, and `EventListItem`.
- **Attempted End-to-End (E2E) Test:**
    - I created `frontend/tests/secret-sync/smoke.spec.ts` with two simple Playwright tests for the Events and Create Event pages.
    - Test execution timed out, likely due to the absence of a fully running application stack (frontend/backend services), which is a prerequisite for E2E tests.
    - The created E2E test script is included and can be run by you in a local environment with the application stack active.

This commit concludes the planned frontend work for the SecretSync speech coordination feature, including API integration, unit tests, and an initial E2E smoke test script.

Author: google-labs-jules[bot]