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/lock/lock_state.dart

@@ -0,0 +1,75 @@
+import '../../../domain/entities/camera_lock.dart';
+
+class LockState {
+  /// All known camera locks
+  final Map<int, CameraLock> locks;
+
+  /// Whether the coordinator is connected
+  final bool coordinatorConnected;
+
+  /// Pending takeover confirmation request (show dialog to user)
+  final TakeoverRequest? pendingTakeover;
+
+  /// Last notification message (for snackbar/toast)
+  final String? lastNotification;
+
+  /// Error message
+  final String? error;
+
+  const LockState({
+    this.locks = const {},
+    this.coordinatorConnected = false,
+    this.pendingTakeover,
+    this.lastNotification,
+    this.error,
+  });
+
+  LockState copyWith({
+    Map<int, CameraLock>? locks,
+    bool? coordinatorConnected,
+    TakeoverRequest? pendingTakeover,
+    bool clearPendingTakeover = false,
+    String? lastNotification,
+    bool clearNotification = false,
+    String? error,
+    bool clearError = false,
+  }) {
+    return LockState(
+      locks: locks ?? this.locks,
+      coordinatorConnected: coordinatorConnected ?? this.coordinatorConnected,
+      pendingTakeover:
+          clearPendingTakeover ? null : (pendingTakeover ?? this.pendingTakeover),
+      lastNotification:
+          clearNotification ? null : (lastNotification ?? this.lastNotification),
+      error: clearError ? null : (error ?? this.error),
+    );
+  }
+
+  /// Check if a camera is locked by this keyboard
+  bool isCameraLockedByMe(int cameraId, String keyboardId) {
+    final lock = locks[cameraId];
+    return lock != null &&
+        lock.ownerName.toLowerCase() == keyboardId.toLowerCase();
+  }
+
+  /// Check if a camera is locked by another keyboard
+  bool isCameraLockedByOther(int cameraId, String keyboardId) {
+    final lock = locks[cameraId];
+    return lock != null &&
+        lock.ownerName.toLowerCase() != keyboardId.toLowerCase();
+  }
+
+  /// Get the lock for a camera, if any
+  CameraLock? getLock(int cameraId) => locks[cameraId];
+}
+
+/// Pending takeover request shown as a dialog
+class TakeoverRequest {
+  final int cameraId;
+  final String requestingKeyboard;
+
+  const TakeoverRequest({
+    required this.cameraId,
+    required this.requestingKeyboard,
+  });
+}