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/camera/camera_state.dart

@@ -0,0 +1,37 @@
+import 'package:equatable/equatable.dart';
+
+class CameraState extends Equatable {
+  final int? selectedCameraId;
+  final bool isConnecting;
+  final String? error;
+  final List<int> availableCameras;
+
+  const CameraState({
+    this.selectedCameraId,
+    this.isConnecting = false,
+    this.error,
+    this.availableCameras = const [],
+  });
+
+  bool get hasSelection => selectedCameraId != null;
+
+  CameraState copyWith({
+    int? selectedCameraId,
+    bool? isConnecting,
+    String? error,
+    List<int>? availableCameras,
+    bool clearSelection = false,
+  }) {
+    return CameraState(
+      selectedCameraId:
+          clearSelection ? null : (selectedCameraId ?? this.selectedCameraId),
+      isConnecting: isConnecting ?? this.isConnecting,
+      error: error,
+      availableCameras: availableCameras ?? this.availableCameras,
+    );
+  }
+
+  @override
+  List<Object?> get props =>
+      [selectedCameraId, isConnecting, error, availableCameras];
+}