feat: polish phase 7 forms and schedules

test/schedule_form_logic_test.dart

@@ -0,0 +1,43 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:ignis_app/features/schedules/schedule_form_logic.dart';
+
+void main() {
+  test('default once time rounds forward and stays in future', () {
+    final now = DateTime(2026, 5, 1, 10, 2);
+
+    final result = defaultOnceScheduleTime(now: now);
+
+    expect(result, DateTime(2026, 5, 1, 14, 5));
+    expect(result.isAfter(now), isTrue);
+  });
+
+  test('once validation rejects missing and past dates', () {
+    final now = DateTime(2026, 5, 1, 10, 0);
+
+    expect(validateOnceSchedule(null, now: now), 'Выберите дату и время');
+    expect(
+      validateOnceSchedule(now.add(const Duration(seconds: 30)), now: now),
+      'Нужна дата хотя бы на минуту вперёд',
+    );
+    expect(
+      validateOnceSchedule(now.add(const Duration(minutes: 2)), now: now),
+      isNull,
+    );
+  });
+
+  test('cron weekday serialization and descriptions stay human readable', () {
+    expect(serializeCronWeekdays({0, 1, 2, 3, 4, 5, 6}), '*');
+    expect(serializeCronWeekdays({1, 5, 0}), '0,1,5');
+    expect(describeCronWeekdays({1, 2, 3, 4, 5}), 'Пн, Вт, Ср, Чт, Пт');
+    expect(describeCronWeekdaysExpression('*'), 'каждый день');
+    expect(describeCronWeekdaysExpression('1,5,0'), 'Пн, Пт, Вс');
+  });
+
+  test('format runAt converts utc timestamp to local label', () {
+    final label = formatRunAtLabel('2026-05-01T12:30:00Z');
+
+    expect(label, isNotEmpty);
+    expect(label.contains('2026'), isTrue);
+    expect(label.contains('12:30') || label.contains('19:30'), isTrue);
+  });
+}