[Testing] React UI component tests

Component + integration tests for React app:
- Generic table renderer (all column types render correctly)
- Generic form renderer (all input types work)
- Contact approval buttons (state transitions)
- Scrape schedule cron builder
- Auth guard (redirect when not logged in)

**Tools:** Vitest + React Testing Library

Locate the React app components and test configuration, then identify the generic table and form renderers, contact approval controls, scrape schedule cron builder, and auth guard. Start by running the existing Vitest suite, if present, and add coverage for the listed rendering, state-transition, scheduling, and redirect behaviors; done means all listed component and integration cases pass.

Written by the indexing model from the issue text.