fiz um sistema de login simples so para testes, deu mts erros estoua tentar resolver, maior problema foi o nav bar sumiu.

app/build.gradle.kts

@@ -1,5 +1,6 @@
 plugins {
     alias(libs.plugins.android.application)
+    alias(libs.plugins.google.gms.google.services)
 }
 
 android {
@@ -44,6 +45,11 @@ dependencies {
     implementation(libs.navigation.fragment)
     implementation(libs.navigation.ui)
     implementation(libs.activity)
+    implementation(libs.firebase.database)
+    implementation(libs.firebase.auth)
+    implementation(libs.credentials)
+    implementation(libs.credentials.play.services.auth)
+    implementation(libs.googleid)
     testImplementation(libs.junit)
     androidTestImplementation(libs.ext.junit)
     androidTestImplementation(libs.espresso.core)