Build exchange workspace and shared transaction services (#28)

frontend/app/lib/workspace/limits.dart

@@ -0,0 +1,80 @@
+import 'package:flutter/material.dart';
+
+import 'package:go_router/go_router.dart';
+
+import 'package:provider/provider.dart';
+
+import 'package:sxchnge_kyc/sxchnge_kyc.dart';
+
+import 'package:sxchnge_wallet/sxchnge_wallet.dart';
+
+import '../kyc/limits.dart';
+
+import '../generated/i18n/app_localizations.dart';
+
+class LimitsPage extends StatefulWidget {
+  const LimitsPage({super.key});
+  @override
+  State<LimitsPage> createState() => _LimitsPageState();
+}
+
+class _LimitsPageState extends State<LimitsPage> {
+  late final _provider = WorkspaceLimitsProvider(
+    context.read<LimitsService>(),
+    context.read<WalletProvider>(),
+  );
+  @override
+  void initState() {
+    super.initState();
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      if (mounted) _provider.refresh();
+    });
+  }
+
+  @override
+  void dispose() {
+    _provider.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final l = AppLocalizations.of(context)!;
+    return ChangeNotifierProvider<LimitsProvider>.value(
+      value: _provider,
+      child: SingleChildScrollView(
+        padding: const EdgeInsets.all(24),
+        child: Center(
+          child: ConstrainedBox(
+            constraints: const BoxConstraints(maxWidth: 720),
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.stretch,
+              children: [
+                Text(
+                  l.wLimits,
+                  style: Theme.of(context).textTheme.displaySmall,
+                ),
+                const SizedBox(height: 12),
+                Text(l.wLimitsScope),
+                const SizedBox(height: 24),
+                const LimitsPanel(),
+                const SizedBox(height: 20),
+                FilledButton(
+                  onPressed: () async {
+                    await context.push('/identity');
+                    if (mounted) _provider.refresh();
+                  },
+                  child: Text(l.wIdentity),
+                ),
+                TextButton(
+                  onPressed: _provider.refresh,
+                  child: Text(l.wRefresh),
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}