App 2.12.1: no scroll bars; energy since start

The pages' scroll bars never faded on the car: a ScrollView shows its
bar on every layout, and the live values lay the page out every two
seconds. StableScrollView, the root of every page, now has none.

A new "Energy since start" tile, left of "Usage since start", shows the
net kWh taken from the pack since the trip began, recuperation counted
back.

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

@@ -110,6 +110,11 @@ final class RangeEstimator {
         tripLast = s;
     }
 
+    /** Net energy taken from the pack since start, in kWh; null before the trip's first sample. */
+    synchronized Double energySinceStart() {
+        return tripLast == null ? null : tripEnergyKwh;
+    }
+
     /** Range at the consumption since start; null until the trip has some distance behind it. */
     synchronized Estimate sinceStart(Double remainingKwh) {
         if (remainingKwh == null || tripDistanceKm < MIN_DISTANCE_KM) return null;