App 2.17.0: speed average, compact top bar, About in Settings

- "Speed, 5-min average" card under Speed: time-weighted mean speed,
  standing included, from the same samples as the other averages.
- The top bar is one compact line (title and subtitle side by side).
  Version, update check and About moved from it to an App card on the
  Settings tab.
- The Overview no longer scrolls in the car's window: checked on the
  emulator at 1778x640, the layout height the car reports, after
  trimming the page's padding and the tyre card's height.
- The capacity hint says "Overview" instead of "Vehicle tab".

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 88
-        versionName "2.16.4"
+        versionCode 89
+        versionName "2.17.0"
 
         // 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.