Technical details:
- skip LayerForge canvas and panel shortcuts when focus is inside editable controls
- patch ComfyUI ChangeTracker undoRedo so Ctrl/Cmd+Z does not leak to graph history while LayerForge owns the shortcut context
- stop clipboard copy/cut/paste events from editable LayerForge UI from bubbling into ComfyUI node clipboard handlers
- route widget-root Ctrl/Cmd+Z, Ctrl/Cmd+Y, and Ctrl/Cmd+Shift+Z through LayerForge canvas undo and redo when the widget is active