…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>

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.

* 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

…irebaseUI-Android into version-10.0.0-beta01

…irebaseUI-Android into version-10.0.0-beta01