InjectionToken<CngxA11yPanelConfig>
Configuration cascade token. Resolution priority (high to low): provideA11yPanelConfigAt(...) in a component's viewProviders, then provideA11yPanelConfig(...) at the application root, then the library defaults.
provideA11yPanelConfigAt(...)
viewProviders
provideA11yPanelConfig(...)
'root'