Initial commit: COPILOT D6 Flutter keyboard controller

Flutter web app replacing legacy WPF CCTV surveillance keyboard controller.
Includes wall overview, section view with monitor grid, camera input,
PTZ control, alarm/lock/sequence BLoCs, and legacy-matching UI styling.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

copilot_keyboard/lib/domain/entities/alarm_state.dart

@@ -0,0 +1,137 @@
+import 'package:equatable/equatable.dart';
+
+/// Alarm state enumeration matching SDK PlcViewerAlarmState
+enum AlarmStatus {
+  newAlarm(0, 'vasNewAlarm'),
+  presented(1, 'vasPresented'),
+  stacked(2, 'vasStacked'),
+  confirmed(3, 'vasConfirmed'),
+  removed(4, 'vasRemoved'),
+  lastConfirmed(5, 'vasLastConfirmed'),
+  lastRemoved(6, 'vasLastRemoved');
+
+  final int value;
+  final String name;
+  const AlarmStatus(this.value, this.name);
+
+  static AlarmStatus fromValue(int value) {
+    return AlarmStatus.values.firstWhere(
+      (s) => s.value == value,
+      orElse: () => AlarmStatus.newAlarm,
+    );
+  }
+
+  /// Check if this status blocks the monitor
+  bool get blocksMonitor =>
+      this == AlarmStatus.newAlarm || this == AlarmStatus.presented;
+}
+
+/// State of a single alarm/event
+class AlarmState extends Equatable {
+  final int eventId;
+  final String eventName;
+  final int typeId;
+  final int foreignKey; // Camera or contact ID
+  final String? serverId;
+  final DateTime startedAt;
+  final DateTime? stoppedAt;
+  final bool isActive;
+  final AlarmStatus status;
+  final int? associatedMonitor;
+
+  const AlarmState({
+    required this.eventId,
+    required this.eventName,
+    required this.typeId,
+    required this.foreignKey,
+    this.serverId,
+    required this.startedAt,
+    this.stoppedAt,
+    required this.isActive,
+    this.status = AlarmStatus.newAlarm,
+    this.associatedMonitor,
+  });
+
+  /// Check if this alarm blocks a monitor
+  bool get blocksMonitor => isActive && status.blocksMonitor;
+
+  /// Create a stopped alarm
+  AlarmState stopped() {
+    return AlarmState(
+      eventId: eventId,
+      eventName: eventName,
+      typeId: typeId,
+      foreignKey: foreignKey,
+      serverId: serverId,
+      startedAt: startedAt,
+      stoppedAt: DateTime.now(),
+      isActive: false,
+      status: AlarmStatus.removed,
+      associatedMonitor: associatedMonitor,
+    );
+  }
+
+  /// Create alarm with updated status
+  AlarmState withStatus(AlarmStatus newStatus) {
+    return AlarmState(
+      eventId: eventId,
+      eventName: eventName,
+      typeId: typeId,
+      foreignKey: foreignKey,
+      serverId: serverId,
+      startedAt: startedAt,
+      stoppedAt: stoppedAt,
+      isActive: isActive,
+      status: newStatus,
+      associatedMonitor: associatedMonitor,
+    );
+  }
+
+  factory AlarmState.fromJson(Map<String, dynamic> json) {
+    return AlarmState(
+      eventId: json['event_id'] as int? ?? 0,
+      eventName: json['event_name'] as String? ?? '',
+      typeId: json['type_id'] as int? ?? 0,
+      foreignKey: json['foreign_key'] as int? ?? 0,
+      serverId: json['server_id'] as String?,
+      startedAt: json['started_at'] != null
+          ? DateTime.parse(json['started_at'] as String)
+          : DateTime.now(),
+      stoppedAt: json['stopped_at'] != null
+          ? DateTime.parse(json['stopped_at'] as String)
+          : null,
+      isActive: json['is_active'] as bool? ?? true,
+      status: AlarmStatus.fromValue(json['status'] as int? ?? 0),
+      associatedMonitor: json['associated_monitor'] as int?,
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      'event_id': eventId,
+      'event_name': eventName,
+      'type_id': typeId,
+      'foreign_key': foreignKey,
+      'server_id': serverId,
+      'started_at': startedAt.toIso8601String(),
+      'stopped_at': stoppedAt?.toIso8601String(),
+      'is_active': isActive,
+      'status': status.value,
+      'associated_monitor': associatedMonitor,
+    };
+  }
+
+  @override
+  List<Object?> get props => [
+        eventId,
+        eventName,
+        typeId,
+        foreignKey,
+        serverId,
+        startedAt,
+        stoppedAt,
+        isActive,
+        status,
+        associatedMonitor,
+      ];
+}