- Add BotServerInstance::start_with_main_stack() for using real LLM
- Update E2E tests to auto-start BotServer and BotUI if not running
- Prefer Brave browser over Chrome/Chromium for CDP testing
- Upgrade chromiumoxide to 0.8
- Add browser window position/size for visibility
- Fix chat tests to require BotUI for chat interface
- Add browser_service.rs for CDP-based browser management
- Remove chromedriver dependency (use CDP directly)