firebase integration with Windows-safe guard implementations added.

flutter pub get run and packages updated accordingly.

game_template/lib/firebase_options.dart

@@ -1,5 +1,6 @@
 // File normally generated by FlutterFire CLI. This is a stand-in.
 // See README.md for details.
+
 import 'package:firebase_core/firebase_core.dart' show FirebaseOptions;
 
 class DefaultFirebaseOptions {

game_template/lib/services/crash_reporting/crash_reporting.dart

@@ -0,0 +1,3 @@
+abstract class CrashReporting {
+  void recordError(Object error, StackTrace stackTrace);
+}

game_template/lib/services/crash_reporting/crash_reporting_desktop.dart

@@ -0,0 +1,8 @@
+import 'crash_reporting.dart';
+
+class CrashReportingImpl implements CrashReporting {
+  @override
+  void recordError(Object error, StackTrace stackTrace) {
+    // no-op on Windows / macOS / Linux
+  }
+}

game_template/lib/services/crash_reporting/crash_reporting_impl.dart

@@ -0,0 +1,5 @@
+// lib/services/crash_reporting/crash_reporting_impl.dart
+
+export 'crash_reporting_desktop.dart'
+    if (dart.library.android) 'crash_reporting_mobile.dart'
+    if (dart.library.ios) 'crash_reporting_mobile.dart';

game_template/lib/services/crash_reporting/crash_reporting_mobile.dart

@@ -0,0 +1,9 @@
+import 'package:firebase_crashlytics/firebase_crashlytics.dart';
+import 'crash_reporting.dart';
+
+class CrashReportingImpl implements CrashReporting {
+  @override
+  void recordError(Object error, StackTrace stackTrace) {
+    FirebaseCrashlytics.instance.recordError(error, stackTrace);
+  }
+}