Compose: add background color to host to avoid blink between nav

app/src/main/java/io/element/android/x/MainActivity.kt

@@ -6,8 +6,11 @@ import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.viewModels
+import androidx.compose.foundation.background
 import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.MaterialTheme
 import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
 import com.ramcosta.composedestinations.DestinationsNavHost
 import com.ramcosta.composedestinations.rememberNavHostEngine
 import io.element.android.x.designsystem.ElementXTheme
@@ -42,6 +45,7 @@ private fun MainScreen(viewModel: MainViewModel) {
     }
 
     DestinationsNavHost(
+        modifier = Modifier.background(MaterialTheme.colorScheme.background),
         engine = engine,
         navController = navController,
         navGraph = NavGraphs.root,