T1: Finalize empty states & onboarding — geofence point format fix

- Handle both [lat, lng] array and {lat, lng} object formats in geofence rendering
- All empty states verified: consistent icon + heading + description + CTA pattern
- Onboarding welcome overlay with localStorage flag

static/index.html

@@ -6906,7 +6906,10 @@
 
         geofences.forEach(gf => {
           const points = typeof gf.points === 'string' ? JSON.parse(gf.points) : gf.points;
-          const latlngs = points.map(p => [p.lat, p.lng]);
+          // Handle both [lat, lng] arrays and {lat, lng} objects
+          const latlngs = points.map(p =>
+            Array.isArray(p) ? [p[0], p[1]] : [p.lat, p.lng]
+          );
           const polygon = L.polygon(latlngs, {
             color: gf.color || '#3388ff',
             fillColor: gf.color || '#3388ff',