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/src/main/java/com/evsuite/abrp/RangeEstimator.java

@@ -177,6 +177,26 @@ final class RangeEstimator {
         return energyKwh / (covered / 3_600_000.0);
     }
 
+    /** Mean speed over the last five minutes, time-weighted, standing included; null below a minute. */
+    synchronized Double averageSpeedKmh(long nowMs) {
+        double distanceKm = 0;
+        long covered = 0;
+        Sample previous = null;
+        for (Sample s : samples) {
+            if (s.timeMs < nowMs - WINDOW_MS) continue;
+            if (previous != null) {
+                long dt = s.timeMs - previous.timeMs;
+                if (dt > 0 && dt <= MAX_GAP_MS) {
+                    distanceKm += (previous.speedKmh + s.speedKmh) / 2 * (dt / 3_600_000.0);
+                    covered += dt;
+                }
+            }
+            previous = s;
+        }
+        if (covered < MIN_WINDOW_MS) return null;
+        return distanceKm / (covered / 3_600_000.0);
+    }
+
     synchronized void clear() {
         samples.clear();
         tripEnergyKwh = 0;