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/monitor_state.dart

@@ -0,0 +1,127 @@
+import 'package:equatable/equatable.dart';
+
+/// Play mode enumeration matching SDK values
+enum PlayMode {
+  unknown(0),
+  playStop(1),
+  playForward(2),
+  playBackward(3),
+  fastForward(4),
+  fastBackward(5),
+  stepForward(6),
+  stepBackward(7),
+  playBOD(8),
+  playEOD(9),
+  quasiLive(10),
+  live(11),
+  nextEvent(12),
+  prevEvent(13),
+  peekLivePicture(14),
+  nextDetectedMotion(17),
+  prevDetectedMotion(18);
+
+  final int value;
+  const PlayMode(this.value);
+
+  static PlayMode fromValue(int value) {
+    return PlayMode.values.firstWhere(
+      (m) => m.value == value,
+      orElse: () => PlayMode.unknown,
+    );
+  }
+}
+
+/// State of a single monitor/viewer
+class MonitorState extends Equatable {
+  final int viewerId;
+  final int currentChannel;
+  final PlayMode playMode;
+  final String? serverId;
+  final DateTime lastUpdated;
+  final bool hasAlarm;
+
+  const MonitorState({
+    required this.viewerId,
+    required this.currentChannel,
+    required this.playMode,
+    this.serverId,
+    required this.lastUpdated,
+    this.hasAlarm = false,
+  });
+
+  /// Check if monitor is currently displaying a camera
+  bool get isActive => currentChannel > 0;
+
+  /// Check if monitor is in live mode
+  bool get isLive => playMode == PlayMode.live || playMode == PlayMode.quasiLive;
+
+  /// Create a cleared state
+  MonitorState cleared() {
+    return MonitorState(
+      viewerId: viewerId,
+      currentChannel: 0,
+      playMode: PlayMode.unknown,
+      serverId: serverId,
+      lastUpdated: DateTime.now(),
+      hasAlarm: hasAlarm,
+    );
+  }
+
+  /// Create updated state with new camera
+  MonitorState withCamera(int channel, PlayMode mode) {
+    return MonitorState(
+      viewerId: viewerId,
+      currentChannel: channel,
+      playMode: mode,
+      serverId: serverId,
+      lastUpdated: DateTime.now(),
+      hasAlarm: hasAlarm,
+    );
+  }
+
+  /// Create state with alarm flag updated
+  MonitorState withAlarm(bool alarm) {
+    return MonitorState(
+      viewerId: viewerId,
+      currentChannel: currentChannel,
+      playMode: playMode,
+      serverId: serverId,
+      lastUpdated: lastUpdated,
+      hasAlarm: alarm,
+    );
+  }
+
+  factory MonitorState.fromJson(Map<String, dynamic> json) {
+    return MonitorState(
+      viewerId: json['viewer_id'] as int? ?? 0,
+      currentChannel: json['current_channel'] as int? ?? 0,
+      playMode: PlayMode.fromValue(json['play_mode'] as int? ?? 0),
+      serverId: json['server_id'] as String?,
+      lastUpdated: json['last_updated'] != null
+          ? DateTime.parse(json['last_updated'] as String)
+          : DateTime.now(),
+      hasAlarm: json['has_alarm'] as bool? ?? false,
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      'viewer_id': viewerId,
+      'current_channel': currentChannel,
+      'play_mode': playMode.value,
+      'server_id': serverId,
+      'last_updated': lastUpdated.toIso8601String(),
+      'has_alarm': hasAlarm,
+    };
+  }
+
+  @override
+  List<Object?> get props => [
+        viewerId,
+        currentChannel,
+        playMode,
+        serverId,
+        lastUpdated,
+        hasAlarm,
+      ];
+}