…uthentication (#2286)

* feat: implement credential manager for saving and retrieving user credentials

* feat: add "Continue as..." feature to enhance user experience with last-used sign-in preferences

* feat: add "Continue with..." options for various sign-in methods in strings.xml

* fix: add applicationContext parameter to signInWithProvider and submitVerificationCode tests

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Co-authored-by: Rosário P. Fernandes <rosariopf@google.com>

* feat: introduce provider button shape customization and update theming API

* feat: add back navigation support to authentication screens

* feat: add customizable screen transitions for Firebase Auth UI

* feat: update theming API to support null theme inheritance and introduce adaptive theme

* refactor: simplify theme observation in AuthUIThemeTest by using CompositionLocalProvider

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Co-authored-by: Rosário P. Fernandes <rosariopf@google.com>

* feat: add Facebook sign-out functionality

* fix: update placeholders in strings.xml

* fix: make Facebook sign-out testable and add provider-specific sign-out tests

* fix: show specific Firebase error message for InvalidCredentialsException in recovery dialog

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Co-authored-by: Rosário P. Fernandes <rosariopf@google.com>

* fix: Update Firebase imports

Replaced `com.google.firebase.auth.ktx.auth` and `com.google.firebase.ktx.Firebase` with the recommended `com.google.firebase.Firebase` and `com.google.firebase.auth.auth` imports.

* chore: bump Firebase BOM version to 34.7.0

…lback pattern (#2295)

* fix: initialize serverClientId to default_web_client_id in AuthProvider.Google

- The `applicationId` parameter has been removed from the `AuthProvider.Facebook` constructor. Configuration values (`facebook_application_id`, `facebook_login_protocol_scheme`, and `facebook_client_token`) are now exclusively read from `strings.xml`.
- The `serverClientId` for the Google provider is now automatically populated from `R.string.default_web_client_id` if it is not explicitly provided.
- Added validation to ensure `facebook_client_token` and `facebook_login_protocol_scheme` are configured in `strings.xml`.
- Updated tests to use resource files for provider configuration instead of constructor arguments.
- Updated `README.md` to reflect the new configuration requirements, including adding `facebook_client_token`.

* fix: fallback to all Google accounts if no authorized accounts found during sign-in

- Add filterByAuthorizedAccounts and autoSelectEnabled properties to AuthProvider.Google

…nd tooltip (#2297)

* fix: initialize serverClientId to default_web_client_id in AuthProvider.Google

- The `applicationId` parameter has been removed from the `AuthProvider.Facebook` constructor. Configuration values (`facebook_application_id`, `facebook_login_protocol_scheme`, and `facebook_client_token`) are now exclusively read from `strings.xml`.
- The `serverClientId` for the Google provider is now automatically populated from `R.string.default_web_client_id` if it is not explicitly provided.
- Added validation to ensure `facebook_client_token` and `facebook_login_protocol_scheme` are configured in `strings.xml`.
- Updated tests to use resource files for provider configuration instead of constructor arguments.
- Updated `README.md` to reflect the new configuration requirements, including adding `facebook_client_token`.

* fix: fallback to all Google accounts if no authorized accounts found during sign-in

- Add filterByAuthorizedAccounts and autoSelectEnabled properties to AuthProvider.Google

* fix: disable Manage MFA button and show tooltip when MFA is disabled

* fix: implement MFA configuration disabled state with tooltip and expose configuration to custom authenticated content

* fix CI

* test: ignore flaky onManageMfa test due to CI timing issues

…2303)

…2304)