Add comprehensive test infrastructure and AI guardrails
- Add Vitest unit tests for AiChatWidget component
- Add Playwright E2E tests: ai-chat-widget, api, security, guardrails
- Add AI guardrails tests validating no phone/email leaks from Ollama
- Add security tests: auth, rate limiting, input validation, token handling
- Add API tests for AI endpoints and authentication
- Fix playwright.config.ts reporter path conflict
- Update CompanyJobsPage with AI generate buttons (orange icon, loading state)
- Fix AiChatWidget accessibility (role=dialog, aria-label, aria-modal)
- Add app.css spin animation for AI loading spinner
- Add Gitea Actions workflow for nightly CI tests
- Add TESTING.md documentation
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