Move Geofence toggle button to map header next to Export

Relocated the "Show/Hide Geofences" toggle button from floating
position (top-right corner) to the main header toolbar.

**Changes:**
- Moved toggle button to header, positioned between Export and Admin buttons
- Converted showGeofences from local state to prop passed from parent
- Button now matches header design system (same styling as Export/Admin)
- Purple background when active, white when inactive
- Better UX: All controls now in one consistent location

**New Button Position:**
Export | Show/Hide Geofences | Admin | Logout

Much cleaner and more intuitive than the floating button!

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/map/page.tsx

@@ -34,6 +34,7 @@ export default function MapPage() {
   const [timeFilter, setTimeFilter] = useState<number>(1); // Default 1 hour
   const [isPaused, setIsPaused] = useState(false);
   const [devices, setDevices] = useState<DeviceInfo[]>([]);
+  const [showGeofences, setShowGeofences] = useState(true);
 
   // Custom range state
   const [filterMode, setFilterMode] = useState<"quick" | "custom">("quick");
@@ -128,7 +129,7 @@ export default function MapPage() {
             {/* Spacer to push buttons to the right */}
             <div className="hidden lg:block lg:flex-1"></div>
 
-            {/* Export, Admin and Logout Buttons */}
+            {/* Export, Geofences, Admin and Logout Buttons */}
             <div className="flex items-center gap-2">
               <a
                 href="/export"
@@ -137,6 +138,18 @@ export default function MapPage() {
                 <span className="mr-1.5">📥</span>
                 Export
               </a>
+              <button
+                onClick={() => setShowGeofences(!showGeofences)}
+                className={`inline-flex items-center px-4 py-2 text-sm font-medium rounded-lg transition-all duration-200 shadow-sm ${
+                  showGeofences
+                    ? "bg-purple-600 text-white border border-purple-600 hover:bg-purple-700 hover:border-purple-700"
+                    : "bg-white text-gray-700 border border-gray-300 hover:bg-gray-50 hover:border-gray-400"
+                }`}
+                title={showGeofences ? "Hide Geofences" : "Show Geofences"}
+              >
+                <span className="mr-1.5">📍</span>
+                {showGeofences ? "Hide" : "Show"} Geofences
+              </button>
               <a
                 href="/admin"
                 className="inline-flex items-center px-4 py-2 text-sm font-medium text-white bg-blue-600 border border-blue-600 rounded-lg hover:bg-blue-700 hover:border-blue-700 transition-all duration-200 shadow-sm"
@@ -192,6 +205,7 @@ export default function MapPage() {
           filterMode={filterMode}
           startTime={startTime}
           endTime={endTime}
+          showGeofences={showGeofences}
         />
       </div>
     </div>