Build exchange workspace and shared transaction services (#28)

frontend/app/lib/main.dart

@@ -10,6 +10,8 @@ import 'package:sxchnge_kyc/sxchnge_kyc.dart';
 
 import 'package:sxchnge_theme/sxchnge_theme.dart';
 
+import 'package:sxchnge_wallet/sxchnge_wallet.dart';
+
 import 'providers/locale.dart';
 import 'routing/router.dart';
 
@@ -28,6 +30,7 @@ class SxchngeApp extends StatefulWidget {
     this.analyticsService,
     this.identityService,
     this.limitsService,
+    this.walletService,
     this.photoService = const FilePhotoService(),
     this.loginService = const DummyLoginService(),
     this.signupService = const DummySignupService(),
@@ -37,6 +40,7 @@ class SxchngeApp extends StatefulWidget {
   final AnalyticsService? analyticsService;
   final IdentityService? identityService;
   final LimitsService? limitsService;
+  final WalletService? walletService;
   final PhotoService photoService;
   final LoginService loginService;
   final SignupService signupService;
@@ -51,7 +55,15 @@ class _SxchngeAppState extends State<SxchngeApp> {
 
   late final _analytics = widget.analyticsService ?? DummyAnalyticsService();
   late final _identity = widget.identityService ?? DummyIdentityService();
-  late final _limits = widget.limitsService ?? DummyLimitsService(_identity);
+  late final _walletService =
+      widget.walletService ??
+      DummyWalletService(_identity, initialLocale: _locale.locale.languageCode);
+  late final _wallet = WalletProvider(_walletService, _analytics);
+  late final _limits =
+      widget.limitsService ??
+      (_walletService is DummyWalletService
+          ? WalletLimitsService(_walletService)
+          : DummyLimitsService(_identity));
   late final _journeys = JourneyRecorder(_analytics);
   late final _services = InstrumentedAuthServices(
     recorder: _journeys,
@@ -82,6 +94,7 @@ class _SxchngeAppState extends State<SxchngeApp> {
     _router.routeInformationProvider.removeListener(_routeChanged);
     _router.dispose();
     _journeys.dispose();
+    _wallet.dispose();
     _locale.dispose();
     super.dispose();
   }
@@ -89,6 +102,7 @@ class _SxchngeAppState extends State<SxchngeApp> {
   @override
   Widget build(BuildContext context) => MultiProvider(
     providers: [
+      ChangeNotifierProvider.value(value: _wallet),
       Provider<JourneyRecorder>.value(value: _journeys),
       Provider<AnalyticsService>.value(value: _analytics),
       Provider<IdentityService>.value(value: _identity),