feat: integrate Firebase Analytics and configure navigation observer in app router

lib/core/analytics/firebase_analytics_config.dart

@@ -0,0 +1,13 @@
+import 'package:firebase_analytics/firebase_analytics.dart';
+
+/// Firebase Analytics feeds the linked GA4 property (`G-DHR81R6Z63` on web,
+/// native app streams for iOS/Android). One instance is reused across the app
+/// for events, and one observer tracks GoRouter screen transitions.
+class FirebaseAnalyticsConfig {
+  FirebaseAnalyticsConfig._();
+
+  static final FirebaseAnalytics instance = FirebaseAnalytics.instance;
+
+  static final FirebaseAnalyticsObserver navigationObserver =
+      FirebaseAnalyticsObserver(analytics: instance);
+}

lib/routing/app_router.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
+import 'package:real_estate_mobile/core/analytics/firebase_analytics_config.dart';
 import 'package:real_estate_mobile/core/analytics/umami_analytics.dart';
 import 'package:real_estate_mobile/core/constants/app_colors.dart';
 import 'package:real_estate_mobile/core/widgets/app_shell.dart';
@@ -45,7 +46,10 @@ final routerProvider = Provider<GoRouter>((ref) {
   return GoRouter(
     initialLocation: '/splash',
     refreshListenable: authRefreshNotifier,
-    observers: [UmamiAnalytics.navigationObserver],
+    observers: [
+      UmamiAnalytics.navigationObserver,
+      FirebaseAnalyticsConfig.navigationObserver,
+    ],
     redirect: (context, state) {
       final authState = ref.read(authProvider);
       final isAuthenticated = authState.status == AuthStatus.authenticated;

macos/Flutter/GeneratedPluginRegistrant.swift

@@ -10,6 +10,7 @@ import device_info_plus
 import emoji_picker_flutter
 import facebook_auth_desktop
 import file_selector_macos
+import firebase_analytics
 import firebase_core
 import firebase_messaging
 import flutter_local_notifications
@@ -29,6 +30,7 @@ func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   EmojiPickerFlutterPlugin.register(with: registry.registrar(forPlugin: "EmojiPickerFlutterPlugin"))
   FacebookAuthDesktopPlugin.register(with: registry.registrar(forPlugin: "FacebookAuthDesktopPlugin"))
   FileSelectorPlugin.register(with: registry.registrar(forPlugin: "FileSelectorPlugin"))
+  FirebaseAnalyticsPlugin.register(with: registry.registrar(forPlugin: "FirebaseAnalyticsPlugin"))
   FLTFirebaseCorePlugin.register(with: registry.registrar(forPlugin: "FLTFirebaseCorePlugin"))
   FLTFirebaseMessagingPlugin.register(with: registry.registrar(forPlugin: "FLTFirebaseMessagingPlugin"))
   FlutterLocalNotificationsPlugin.register(with: registry.registrar(forPlugin: "FlutterLocalNotificationsPlugin"))

pubspec.lock

@@ -393,6 +393,30 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.9.3+5"
+  firebase_analytics:
+    dependency: "direct main"
+    description:
+      name: firebase_analytics
+      sha256: "4f85b161772e1d54a66893ef131c0a44bd9e552efa78b33d5f4f60d2caa5c8a3"
+      url: "https://pub.dev"
+    source: hosted
+    version: "11.6.0"
+  firebase_analytics_platform_interface:
+    dependency: transitive
+    description:
+      name: firebase_analytics_platform_interface
+      sha256: a44b6d1155ed5cae7641e3de7163111cfd9f6f6c954ca916dc6a3bdfa86bf845
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.4.3"
+  firebase_analytics_web:
+    dependency: transitive
+    description:
+      name: firebase_analytics_web
+      sha256: c7d1ed1f86ae64215757518af5576ff88341c8ce5741988c05cc3b2e07b0b273
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.5.10+16"
   firebase_core:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -71,6 +71,9 @@ dependencies:
   # Microsoft Clarity (session recording / heatmaps)
   clarity_flutter: ^1.8.0
 
+  # Google Analytics (via Firebase Analytics — feeds the linked GA4 property)
+  firebase_analytics: ^11.3.0
+
 dev_dependencies:
   flutter_test:
     sdk: flutter