Start writing the web app

Signed-off-by: Nikolai Rodionov <allanger@posteo.com>

lib/features/test/application/test_controller.dart

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+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:softplayer_web/core/api/v1/test.dart';
+import 'package:softplayer_web/core/tokens/application/tokens_application.dart';
+
+final pingControllerProvider = AsyncNotifierProvider<PingController, String>(
+  PingController.new,
+);
+
+class PingController extends AsyncNotifier<String> {
+  @override
+  Future<String> build() async {
+    return 'Idle';
+  }
+
+  Future<void> ping() async {
+    state = const AsyncLoading();
+
+    state = await AsyncValue.guard(() async {
+      final testGrpc = ref.read(testGrpcProvider);
+      final tokenCtrl = ref.read(tokensControllerProvider.notifier);
+      await tokenCtrl.checkTokens();
+
+      await testGrpc.pong();
+
+      return 'Ping successful';
+    });
+  }
+}

lib/features/test/presentation/ping_page.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../application/test_controller.dart';
+
+class PingPage extends ConsumerWidget {
+  const PingPage({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final state = ref.watch(pingControllerProvider);
+
+    return Scaffold(
+      appBar: AppBar(title: const Text('gRPC Ping')),
+      body: Center(
+        child: state.when(
+          data: (value) => Text(value),
+          loading: () => const CircularProgressIndicator(),
+          error: (e, _) => Text('Error: $e'),
+        ),
+      ),
+      floatingActionButton: FloatingActionButton(
+        onPressed: () {
+          ref.read(pingControllerProvider.notifier).ping();
+        },
+        child: const Icon(Icons.send),
+      ),
+    );
+  }
+}