Fix #1595 navigation to topic detail screen causes crash

Change-Id: Ib5e764d47cbb810df5af12c2345f4f85baeac6b2

app/src/main/kotlin/com/google/samples/apps/nowinandroid/ui/interests2pane/InterestsListDetailScreen.kt

@@ -17,6 +17,7 @@
 package com.google.samples.apps.nowinandroid.ui.interests2pane
 
 import androidx.activity.compose.BackHandler
+import androidx.annotation.Keep
 import androidx.compose.material3.adaptive.ExperimentalMaterial3AdaptiveApi
 import androidx.compose.material3.adaptive.WindowAdaptiveInfo
 import androidx.compose.material3.adaptive.currentWindowAdaptiveInfo
@@ -53,6 +54,8 @@ import java.util.UUID
 
 @Serializable internal object TopicPlaceholderRoute
 
+// TODO: Remove @Keep when https://issuetracker.google.com/353898971 is fixed
+@Keep
 @Serializable internal object DetailPaneNavHostRoute
 
 fun NavGraphBuilder.interestsListDetailScreen() {