Full Compose settings (#8201)

* Uses Voyager for navigation.
* Replaces every screen inside settings except category editor screen since it's
called from several places.

core/src/main/java/eu/kanade/tachiyomi/network/NetworkHelper.kt

@@ -69,6 +69,6 @@ class NetworkHelper(context: Context) {
     }
 
     val defaultUserAgent by lazy {
-        preferences.defaultUserAgent().get()
+        preferences.defaultUserAgent().get().trim()
     }
 }