refactor: update authentication handling and model configuration

- Enhanced authentication method validation in `auth.ts` and `auth.test.ts`.
- Introduced new model provider configuration logic
- Updated environment variable handling for various auth types.
- Removed deprecated utility functions and tests related to fallback mechanisms.

packages/cli/src/ui/components/shared/DescriptiveRadioButtonSelect.tsx

@@ -11,7 +11,7 @@ import { BaseSelectionList } from './BaseSelectionList.js';
 import type { SelectionListItem } from '../../hooks/useSelectionList.js';
 
 export interface DescriptiveRadioSelectItem<T> extends SelectionListItem<T> {
-  title: string;
+  title: React.ReactNode;
   description: string;
 }