Display used and reserved limits capacity

frontend/packages/sxchnge_kyc/test/limits_test.dart

@@ -0,0 +1,47 @@
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:sxchnge_kyc/sxchnge_kyc.dart';
+import 'package:sxchnge_kyc/src/transport/contracts.dart';
+
+void main() {
+  test('mapping preserves backend usage and independent remaining value', () {
+    final data = LimitsMapper.fromDTO(
+      const LimitsDTO(
+        tier: 'basic',
+        simulated: false,
+        rows: [LimitDTO('day', 'EUR', 10000, 250000, 10000, 5500, 3000, 1000)],
+      ),
+    );
+    final row = data.rows.single;
+    expect(row.usedMinor, 3000);
+    expect(row.reservedMinor, 1000);
+    expect(row.remainingMinor, 5500);
+    expect(row.occupiedFraction, 0.4);
+  });
+  test('capacity visualization handles unused, exhausted and zero caps', () {
+    VisibleLimit row(int cap, int used, int reserved) => VisibleLimit(
+      period: LimitPeriod.day,
+      currency: 'EUR',
+      basicMinor: cap,
+      verifiedMinor: cap,
+      currentMinor: cap,
+      remainingMinor: 0,
+      usedMinor: used,
+      reservedMinor: reserved,
+    );
+    expect(row(10000, 0, 0).occupiedFraction, 0);
+    expect(row(10000, 8000, 2000).occupiedFraction, 1);
+    expect(row(10000, 12000, 2000).occupiedFraction, 1);
+    expect(row(0, 0, 0).occupiedFraction, 0);
+  });
+  test('stub provides nonzero daily and monthly usage', () async {
+    final identity = DummyIdentityService(delay: Duration.zero);
+    final service = DummyLimitsService(identity);
+    final data = await service.fetch();
+    expect(data.rows.first.usedMinor, 3000);
+    expect(data.rows.first.reservedMinor, 1000);
+    expect(data.rows.first.remainingMinor, 6000);
+    expect(data.rows.last.usedMinor, 18000);
+    expect(data.rows.last.remainingMinor, 31000);
+  });
+}