App 2.39.0, server 2.7.0: Grid with map

A new Overview style: the Grid over the roads round the car from
OpenStreetMap, drawn in the floor's perspective, heading up, the bigger
roads glowing brighter, the car as a chevron.

Server: POST /v1/map/roads {z:14,x,y} fetches a tile's drivable roads
from Overpass (OVERPASS_URL; one request at a time, at least a second
apart), simplifies them to tile-local points in four classes, caches
them for 30 days and never logs the tile.

App: MapRoads keeps the 3x3 tiles round the car from its own cache or
the server; GPS only while the style is shown; bearing from the GPS or
from successive positions. Without GPS, server or roads the plain floor
says why. OSM attribution on screen and in LICENSE.md.

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/OverviewStyle.java

@@ -27,6 +27,7 @@ enum OverviewStyle {
     NIXIE(false, false),
     CHRONOGRAPH(true, false),
     GRID(true, true),
+    GRID_MAP(true, true),
     TIME_CIRCUITS(false, false),
     QUEST(false, false),
     VISOR(true, true),
@@ -53,7 +54,8 @@ enum OverviewStyle {
 
     /** Where the choice between the original palette and the accent colour is kept. */
     String originalKey() {
-        return "original_colours_" + name();
+        // Grid with map is the Grid over a map: one choice for both.
+        return "original_colours_" + (this == GRID_MAP ? GRID : this).name();
     }
 
     /**