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/presentation/blocs/ptz/ptz_state.dart

@@ -0,0 +1,50 @@
+import 'package:equatable/equatable.dart';
+
+enum PtzDirection { none, left, right, up, down, zoomIn, zoomOut }
+
+enum PtzLockStatus { none, acquiring, locked, denied }
+
+class PtzState extends Equatable {
+  final int? activeCameraId;
+  final PtzDirection currentDirection;
+  final bool isMoving;
+  final PtzLockStatus lockStatus;
+  final String? lockedBy;
+  final String? error;
+
+  const PtzState({
+    this.activeCameraId,
+    this.currentDirection = PtzDirection.none,
+    this.isMoving = false,
+    this.lockStatus = PtzLockStatus.none,
+    this.lockedBy,
+    this.error,
+  });
+
+  bool get hasActiveCamera => activeCameraId != null;
+  bool get hasLock => lockStatus == PtzLockStatus.locked;
+
+  PtzState copyWith({
+    int? activeCameraId,
+    PtzDirection? currentDirection,
+    bool? isMoving,
+    PtzLockStatus? lockStatus,
+    String? lockedBy,
+    String? error,
+    bool clearCamera = false,
+  }) {
+    return PtzState(
+      activeCameraId:
+          clearCamera ? null : (activeCameraId ?? this.activeCameraId),
+      currentDirection: currentDirection ?? this.currentDirection,
+      isMoving: isMoving ?? this.isMoving,
+      lockStatus: lockStatus ?? this.lockStatus,
+      lockedBy: lockedBy ?? this.lockedBy,
+      error: error,
+    );
+  }
+
+  @override
+  List<Object?> get props =>
+      [activeCameraId, currentDirection, isMoving, lockStatus, lockedBy, error];
+}