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/sequence/sequence_event.dart

@@ -0,0 +1,26 @@
+abstract class SequenceEvent {}
+
+/// Load available sequences and categories from coordinator
+class LoadSequences extends SequenceEvent {}
+
+/// Start a sequence on a viewer
+class StartSequence extends SequenceEvent {
+  final int viewerId;
+  final int sequenceId;
+
+  StartSequence({required this.viewerId, required this.sequenceId});
+}
+
+/// Stop a sequence on a viewer
+class StopSequence extends SequenceEvent {
+  final int viewerId;
+
+  StopSequence(this.viewerId);
+}
+
+/// Filter sequences by category
+class SelectCategory extends SequenceEvent {
+  final int? categoryId;
+
+  SelectCategory(this.categoryId);
+}