Require Android 8+

Given that the next stable version of Chrome (120) will require Android 8+, it's
inevitable that the WebView functionality will gradually break. As always, newer
OS versions are recommended for better support with evolving Internet technologies.

According to https://apilevels.com/, Android 8+ still covers 93.7% of Android users.

app/src/main/java/eu/kanade/presentation/util/Navigator.kt

@@ -79,6 +79,7 @@ fun ScreenTransition(
         targetState = navigator.lastItem,
         transitionSpec = transition,
         modifier = modifier,
+        label = "ScreenTransition",
     ) { screen ->
         navigator.saveableState("transition", screen) {
             content(screen)