App 2.19.6: remove the CarPlay full-screen switch and the export button

CarPlay's 1920x640 is fixed in Allgo's system app. On start the car
build removes the CarPlay entry from policy_control if the switch was
left on.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LhzAVaUyqcw5PkGjz4mWW6

app/build.gradle

@@ -34,8 +34,8 @@ android {
         applicationId "com.stinnesbeck.nilsmg4"
         minSdk 27
         targetSdk 36
-        versionCode 104
-        versionName "2.19.5"
+        versionCode 105
+        versionName "2.19.6"
 
         // Nothing about the server ships in the APK: its URL and ingest token are entered in
         // the app's Server tab (ServerConfig), and the database is only reachable by the server.