App 2.36.0: Overview style Grid, after the Tron films

Neon lines on black over a perspective grid floor that moves with the
speed; the battery as a light wall, power on a disc whose inner ring
turns with it, and the last two minutes of power as a light-cycle trail
of right angles (the Cockpit's PowerTrace, now in ClusterValues). Cyan,
or the accent colour; in cyan the app turns cyan too. In THEMES.md with
two screenshots. Emulator only; not tried on the car.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LhzAVaUyqcw5PkGjz4mWW6

app/src/main/java/com/evsuite/abrp/ClusterValues.java

@@ -21,4 +21,6 @@ final class ClusterValues {
     String clock = "";
     /** Tyre pressures formatted in the chosen unit, "—" when unread; never null. */
     String tyreFl = "—", tyreFr = "—", tyreRl = "—", tyreRr = "—";
+    /** Battery power over the last two minutes, oldest first, NaN where unread; null before any. */
+    float[] powerTrail;
 }