feat: Add map navigation, enhance FCM deep linking, localize Google Places API, and refine activity display.

lib/services/map_navigation_service.dart

@@ -0,0 +1,36 @@
+import 'dart:async';
+
+class MapLocationRequest {
+  final double latitude;
+  final double longitude;
+  final String? name;
+  final DateTime timestamp;
+
+  MapLocationRequest({
+    required this.latitude,
+    required this.longitude,
+    this.name,
+  }) : timestamp = DateTime.now();
+}
+
+class MapNavigationService {
+  final _requestController = StreamController<MapLocationRequest>.broadcast();
+  MapLocationRequest? _lastRequest;
+
+  Stream<MapLocationRequest> get requestStream => _requestController.stream;
+  MapLocationRequest? get lastRequest => _lastRequest;
+
+  void navigateToLocation(double lat, double lng, {String? name}) {
+    final request = MapLocationRequest(
+      latitude: lat,
+      longitude: lng,
+      name: name,
+    );
+    _lastRequest = request;
+    _requestController.add(request);
+  }
+
+  void dispose() {
+    _requestController.close();
+  }
+}