Replace custom authentication component implementations in the console app with standardized components from @storacha/ui-react.

Background

The console app currently uses @storacha/ui-react's Authenticator components but wraps them with custom implementations. We should fully migrate to the shared components and contribute any missing features back to the library.

Current State

Files that need migration:

• /packages/console/src/components/Authenticator.tsx
• /packages/console/src/components/IframeAuthenticator.tsx (partially - iframe-specific logic should remain)

Currently using from @storacha/ui-react:

• Authenticator (as AuthCore)
• useAuthenticator hook
• Basic form components

Tasks

• Analyze custom styling and behavior in AuthenticationForm component
• Determine if custom email validation or plausible tracking can be integrated into @storacha/ui-react
• Migrate AuthenticationSubmitted component logic
• Refactor AuthenticationEnsurer to use standard patterns from @storacha/ui-react
• Extract and preserve iframe-specific authentication logic
• Update all imports and usages throughout the console app
• Test authentication flow in both standard and iframe contexts