- Add uiContext struct bundling colorizer, icons, client, config, and connected state
- Add newUIContext to initialize context from CLIConfig and probe API connectivity
- Add styled output methods: header, info, success, warn, errorln, muted
- Add connectivityBanner to display warning when API server is unreachable
- Add endpointDisplay to format API endpoint for display
- Add newTable convenience method to create configured UI table
- Add statusStyle to map status strings to semantic styles (success, warning, error,
