chore: add geoflutterfire_plus fetchWithin sample

packages/mottai_flutter_app/lib/development/development_items/ui/development_items.dart

@@ -17,6 +17,7 @@ import '../../color/ui/color.dart';
 import '../../firebase_storage/ui/firebase_storage.dart';
 import '../../force_update/ui/force_update.dart';
 import '../../generic_image/ui/generic_images.dart';
+import '../../geoflutterfire_plus/geoflutterfire_plus.dart';
 import '../../image_detail_view/ui/image_detail_view_stub.dart';
 import '../../image_picker/ui/image_picker_sample.dart';
 import '../../in_review/ui/in_review.dart';
@@ -224,6 +225,17 @@ class DevelopmentItemsPage extends ConsumerWidget {
             ),
             onTap: () => context.router.pushNamed(ColorPage.location),
           ),
+          ListTile(
+            title: const Text(
+              'geoflutterfire_plus の機能確認',
+            ),
+            onTap: () => Navigator.push<void>(
+              context,
+              MaterialPageRoute(
+                builder: (context) => const GeoflutterfirePlusSample(),
+              ),
+            ),
+          ),
         ],
       ),
     );

packages/mottai_flutter_app/lib/development/geoflutterfire_plus/geoflutterfire_plus.dart

@@ -0,0 +1,38 @@
+import 'package:cloud_firestore/cloud_firestore.dart';
+import 'package:flutter/material.dart';
+import 'package:geoflutterfire_plus/geoflutterfire_plus.dart';
+
+/// geoflutterfire_plus パッケージの動作確認用 Widget.
+class GeoflutterfirePlusSample extends StatelessWidget {
+  const GeoflutterfirePlusSample({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(),
+      body: ListView(
+        children: [
+          ListTile(
+            leading: const Icon(Icons.map),
+            title: const Text('Call fetchWithin method'),
+            onTap: () async {
+              final locationCollectionRef =
+                  FirebaseFirestore.instance.collection('locations');
+              const center = GeoFirePoint(GeoPoint(35.681236, 139.767125));
+              final result = await GeoCollectionReference(locationCollectionRef)
+                  .fetchWithin(
+                center: center,
+                radiusInKm: 6,
+                field: 'geo',
+                strictMode: true,
+                geopointFrom: (data) => (data['geo']
+                    as Map<String, dynamic>)['geopoint'] as GeoPoint,
+              );
+              debugPrint(result.toString());
+            },
+          ),
+        ],
+      ),
+    );
+  }
+}