Refactor: Centralize Google Sign-In config and improve social login UX

[rndevelo]

This commit refactors how Google Sign-In is configured by centralizing it within the Koin dependency graph, and improves the user experience for social logins by adding distinct loading states for each provider.

Core Architecture & Configuration:

• Centralized GoogleSignInConfig: The GoogleSignInConfig is no longer passed via a LoginLibraryConfig wrapper. Instead, it's provided directly to initLoginKoin and injected into the Koin dependency graph, making it available throughout the library.
• Simplified Koin Initialization: The initLoginKoin function is simplified to accept googleSignInConfig directly, streamlining the library's setup in both Android and iOS app modules.
• Domain Model Relocation: The GoogleSignInConfig class has been moved from the config package to domain/model to better align with the project's architecture.

UI/UX Improvements:

• Provider-Specific Loading States:
  • The LoginUiState now uses a loadingProvider: String? property instead of a generic isLoading: Boolean. This allows the UI to show a loading indicator on the specific social login button that was clicked (e.g., "google", "phone") or on the email sign-in button ("email").
  • The DefaultSocialButton and its implementations (GoogleSocialButton, PhoneSocialButton) have been updated to accept an isLoading state, displaying a CircularProgressIndicator when active.
  • Other buttons on the screen are disabled when any login process is active, preventing concurrent actions.
• Refactored Social Login Section:
  • The SocialLoginButtonsSection now receives the loadingProvider state to correctly render the loading status for each button.
  • The old, more complex SocialLoginButtons.kt file has been removed in favor of a cleaner implementation in DefaultSocialButton.kt.

Other Changes:

• Session Refresh: The ProfileViewModel now calls authRepository.refreshSession() instead of the removed getCurrentSession() to fetch user data, ensuring the session is up-to-date.
• Code Cleanup: Removed the now-redundant getCurrentSession() method from AuthRepository and its implementation.
• Android Manifest: Added the INTERNET permission to the composeApp manifest, which was missing.