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_event.dart

@@ -0,0 +1,60 @@
+import '../../../domain/entities/camera_lock.dart';
+
+abstract class LockEvent {}
+
+/// Try to acquire a lock on a camera
+class TryLock extends LockEvent {
+  final int cameraId;
+  final CameraLockPriority priority;
+
+  TryLock(this.cameraId, {this.priority = CameraLockPriority.low});
+}
+
+/// Release a camera lock
+class ReleaseLock extends LockEvent {
+  final int cameraId;
+  ReleaseLock(this.cameraId);
+}
+
+/// Release all locks held by this keyboard
+class ReleaseAllLocks extends LockEvent {}
+
+/// Request takeover of a camera locked by another keyboard
+class RequestTakeover extends LockEvent {
+  final int cameraId;
+  final CameraLockPriority priority;
+
+  RequestTakeover(this.cameraId, {this.priority = CameraLockPriority.low});
+}
+
+/// Confirm or reject a takeover request from another keyboard
+class ConfirmTakeover extends LockEvent {
+  final int cameraId;
+  final bool confirm;
+
+  ConfirmTakeover(this.cameraId, {required this.confirm});
+}
+
+/// Reset lock expiration (keep-alive during PTZ)
+class ResetLockExpiration extends LockEvent {
+  final int cameraId;
+  ResetLockExpiration(this.cameraId);
+}
+
+/// Internal: lock state updated from coordinator WebSocket
+class LocksUpdated extends LockEvent {
+  final Map<int, CameraLock> locks;
+  LocksUpdated(this.locks);
+}
+
+/// Internal: lock notification received from coordinator
+class LockNotificationReceived extends LockEvent {
+  final CameraLockNotification notification;
+  LockNotificationReceived(this.notification);
+}
+
+/// Internal: coordinator connection status changed
+class CoordinatorConnectionChanged extends LockEvent {
+  final bool connected;
+  CoordinatorConnectionChanged(this.connected);
+}