Merge: add Safaricom HQ POI (Waiyaki Way)

Second persistent POI marker alongside Fireside HQ, at Safaricom House on
Waiyaki Way (-1.2589726, 36.7854625, geocoded via OpenStreetMap).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

index.html

@@ -478,7 +478,10 @@ const POLL_INTERVAL_MS = 15000;
 const EAST_AFRICA = { center: [37.5, -3.0], zoom: 5.2 };
 const STALE_GPS_MS = 10 * 60 * 1000;
 const OFFLINE_THRESHOLD_MS = 24 * 60 * 60 * 1000;
-const POIS = [{ name: 'Fireside HQ', lng: 36.728785, lat: -1.2411485 }];
+const POIS = [
+  { name: 'Fireside HQ',  lng: 36.728785,  lat: -1.2411485 },
+  { name: 'Safaricom HQ', lng: 36.7854625, lat: -1.2589726 },  // Safaricom House, Waiyaki Way (OSM)
+];
 
 // Deliberate, distinct colour per cost centre so all vehicles in a centre share
 // one colour and different centres are easy to tell apart at a glance. Keys are