App 2.10.1: show negative usage while recuperating

Net regeneration over the window (or the trip) used to hide both
estimates behind "needs a few minutes of driving". It is a real
reading: the usage now shows as negative kWh/100 km, and the range as
"> 999 km" with "while recuperating" beneath it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QLJfZQZeAKAwSqViTmLzki

app/build.gradle

@@ -34,8 +34,8 @@ android {
         applicationId "com.stinnesbeck.nilsmg4"
         minSdk 27
         targetSdk 36
-        versionCode 70
-        versionName "2.10.0"
+        versionCode 71
+        versionName "2.10.1"
 
         // 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.