This commit integrates Firebase Authentication into the application and refactors the `main.dart` file to streamline the user authentication flow. The application will now automatically switch between the main layout and the authentication UI based on the user's sign-in status.
- Added Firebase initialization to the `main()` function for Firebase Authentication.
- Replaced the home page in `MyApp` with a `StreamBuilder` that listens for Firebase auth state changes.
- Based on the auth state, the home page will either show `MainLayout` (if the user is signed in) or `FirebaseAuthView` (if the user is not signed in).
- Added necessary imports for the Firebase and authentication services.
This commit adds the `FirebaseAuthView` class, a Flutter widget that serves as the UI for user authentication using Google and GitHub. The class uses the `AuthService` to handle the actual sign-in logic.
Features:
- Added an OutlinedButton for Google Sign-In, styled with Google's colors and logo.
- Added an OutlinedButton for GitHub Sign-In, styled with GitHub's colors and logo.
- Integrated the `AuthService` methods for Google and GitHub sign-in.
This commit introduces the AuthService class, which encapsulates the logic for signing in with Google and GitHub using Firebase Authentication. The class provides methods for initiating the OAuth flows for both providers and for signing out the user.
- Implemented `signInWithGoogle()` to handle Google Sign-In.
- Implemented `signInWithGitHub()` to handle GitHub Sign-In via popup.
- Added `signOut()` method for logging out the user.
- Added `getCurrentUser()` method to fetch the currently authenticated user.
