Pass commandStack to TimelinePanel for undo/redo support

Author: S1mplector

editor/src/main/java/com/jvn/editor/ui/actioneditor/PuppeteerWindow.java

@@ -258,7 +258,7 @@ public PuppeteerWindow(AnimationProject project) {
         setHeight(900);
 
         entitySelector = new EntitySelector();
-        timelinePanel = new TimelinePanel(this.project);
+        timelinePanel = new TimelinePanel(this.project, commandStack);
         selectionModel = timelinePanel.getSelectionModel();
         keyframeEditor = new KeyframeEditor();
         keyframeEditor.setTimelineDurationMs(this.project.getTotalDurationMs());

editor/src/main/java/com/jvn/editor/ui/actioneditor/TimelinePanel.java

@@ -72,6 +72,7 @@ private static Color trackColorFor(PropertyType prop) {
     }
 
     private final AnimationProject project;
+    private final PuppeteerCommand.Stack commandStack;
     private final Canvas canvas;
     private final ScrollPane scrollPane;
     private final Pane canvasContainer;
@@ -118,7 +119,12 @@ private record TrackRow(EntityTrack track,
     private record KeyframeHit(TrackRow row, Keyframe keyframe) {}
 
     public TimelinePanel(AnimationProject project) {
+        this(project, null);
+    }
+
+    public TimelinePanel(AnimationProject project, PuppeteerCommand.Stack commandStack) {
         this.project = project;
+        this.commandStack = commandStack;
 
         canvas = new Canvas(800, 400);
         canvasContainer = new Pane(canvas);