Remove info-level lint issues: avoid_dynamic_calls, use_build_context_synchronously, avoid_print, non_constant_identifier_names

- Type dynamic map accesses properly (avoid_dynamic_calls in genericMap, globalFiresBottomStats)
- Capture context before async gaps (use_build_context_synchronously in genericMap, genericMapBottom, globalFiresBottomStats)
- Replace print() with debugPrint() (avoid_print in firesApi.dart)
- Rename fireMarker function and _LayerSelectorButton to camelCase
- Rename variable FireNotifications to fireNotifications
- Fix no_default_cases in switch statements (add missing subscriptionConfirm case)
- Make FireNotification fields final, remove @immutable from YourLocation (mutable)
- Make monitoredAreas field final in _ViewModel
- Update subscribeViaApi to use copyWith instead of direct field assignment

lib/genericMapBottom.dart

@@ -112,17 +112,20 @@ class GenericMapBottom extends StatelessWidget {
                               return DropdownMenuItem<FalsePositiveType>(
                                   value: value, child: Text(menuText));
                             }).toList(),
-                            onChanged: (FalsePositiveType? value) async {
+                            onChanged: (FalsePositiveType? value) {
+                              final S strings = S.of(context);
+                              final ScaffoldMessengerState messenger =
+                                  ScaffoldMessenger.of(context);
                               if (value != null) {
                                 onFalsePositive(notif, value);
                               }
-                              await Future<void>.delayed(
-                                  const Duration(milliseconds: 500));
-                              ScaffoldMessenger.of(context)
-                                  .showSnackBar(SnackBar(
-                                content:
-                                    Text(S.of(context).thanksForParticipating),
-                              ));
+                              Future<void>.delayed(
+                                      const Duration(milliseconds: 500))
+                                  .then((_) {
+                                messenger.showSnackBar(SnackBar(
+                                  content: Text(strings.thanksForParticipating),
+                                ));
+                              });
                             }),
                       ] as List<Widget>)))));
         }