Add functional login page with email/password form:
- Client component with controlled form inputs
- PocketBase authentication integration
- Error handling with visual feedback
- Loading states (disabled inputs, button text change)
- Form validation (prevents empty submissions)
- Redirect to dashboard on successful login
Test infrastructure improvements:
- Add @testing-library/jest-dom for DOM matchers
- Add global test setup with cleanup between tests
- Configure vitest.config.ts with setupFiles
14 new tests covering form rendering, auth flow, error
handling, and validation.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
