Settings: Wiedergabe card + picker dialogs instead of chip walls

- Quelle and Stream-Qualität move out of Konto into their own
  Wiedergabe card; Konto is account + Abmelden only.
- Choices open a TV-style picker dialog (focus starts on the current
  value, Back closes) with the current value + drawn caret shown at
  the row's trailing edge.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/build.gradle.kts

@@ -12,8 +12,8 @@ android {
         applicationId = "dev.castarr.tv"
         minSdk = 26
         targetSdk = 35
-        versionCode = 15
-        versionName = "0.7.2"
+        versionCode = 16
+        versionName = "0.8.0"
     }
 
     // Release signing from environment (see ~/.keys/castarr-release.env on the