App 2.31.1: log the cruise control while driving, with every assist value

The 2.27.3 log wrote a line only when the target speed changed, so the
car showed one line at the start. Now a line is written on any change of
a mode or the target and every 2 s while driving, with the raw
driver-assistance properties (target speed, assist and speed-assist
modes, the followed object) and the reason for any unread value. The
last 600 lines are kept in an appended file; the Logs tab shows 150.

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 128
-        versionName "2.31.0"
+        versionCode 129
+        versionName "2.31.1"
 
         // 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.