Scope ViewModels to navigation entries.

Add `rememberViewModelStoreNavEntryDecorator` to the list of decorators for `NavEntry` instances. This enables support for `ViewModel` instances within the navigation component.

core/navigation/src/main/kotlin/com/google/samples/apps/nowinandroid/core/navigation/NavigationState.kt

@@ -23,6 +23,7 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.snapshots.SnapshotStateList
 import androidx.compose.runtime.toMutableStateList
+import androidx.lifecycle.viewmodel.navigation3.rememberViewModelStoreNavEntryDecorator
 import androidx.navigation3.runtime.NavBackStack
 import androidx.navigation3.runtime.NavEntry
 import androidx.navigation3.runtime.NavKey
@@ -86,6 +87,7 @@ fun NavigationState.toEntries(
     val decoratedEntries = subStacks.mapValues { (_, stack) ->
         val decorators = listOf(
             rememberSaveableStateHolderNavEntryDecorator<NavKey>(),
+            rememberViewModelStoreNavEntryDecorator<NavKey>()
         )
         rememberDecoratedNavEntries(
             backStack = stack,