Fix: Add userAgentPackageName to TileLayer for flutter_map v6.2.1 tile rendering

Maps were not rendering in flutter_map v6.2.1 because TileLayer was missing the
required userAgentPackageName property. This property is needed for proper
HTTP requests to tile servers with correct User-Agent headers.

- Updated TileLayer in genericMap.dart with userAgentPackageName
- Updated TileLayer in monitoredAreas.dart with userAgentPackageName
- Fixes: Maps not displaying tiles after flutter_map v6 migration

lib/genericMap.dart

@@ -214,6 +214,7 @@ class _genericMapState extends State<genericMap> {
                 maxZoom: maxZoom,
                 urlTemplate: baseLayer,
                 subdomains: subdomains,
+                userAgentPackageName: 'com.example.fires_flutter',
                 additionalOptions: {
                   // 'opacity': '0.1',
                 },

lib/monitoredAreas.dart

@@ -81,7 +81,9 @@ class MonitoredAreasPage extends StatelessWidget {
                               new TileLayer(
                                   urlTemplate:
                                       "https://tiles.wmflabs.org/bw-mapnik/{z}/{x}/{y}.png",
-                                  subdomains: ['a', 'b', 'c']),
+                                  subdomains: ['a', 'b', 'c'],
+                                  userAgentPackageName:
+                                      'com.example.fires_flutter'),
                               new PolylineLayer(
                                 polylines: view.monitoredAreas,
                               )